{"title":"Fixed Gas Detection Systems","description":"\u003c!-- COLLECTION: fixed-gas-detection-systems | smart-rule tag = \"fixed-gas-detector\" --\u003e\n\n\u003c!-- TODO when SKUs are tagged: (1) set Editor's-pick internal link to the hero product, (2) add product rows to the comparison table, (3) add ItemList schema to the @graph. --\u003e\n\n\u003ch2\u003eWhich fixed gas detection system should a facility install in 2026?\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eShort answer:\u003c\/strong\u003e For continuous, unattended monitoring of a plant area, the right fixed system pairs point detectors — catalytic-bead or infrared for combustibles, electrochemical for toxics and oxygen — with a controller that drives alarms, ventilation and shutdowns. Choose infrared (NDIR) detectors for combustibles where sensor poisoning or low oxygen is a concern, and electrochemical heads for specific toxic gases such as CO, H2S or Cl2.\u003c\/p\u003e\n\n\u003cp\u003eFixed gas detection systems are permanently mounted to walls, ceilings or process equipment and monitor an area continuously, around the clock, without anyone present. They are the always-on layer of the \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e hub. Where \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e and \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e protect people for a task or a shift, a fixed system protects a space indefinitely and can trigger ventilation and shutdowns automatically. For temporary or relocatable coverage, see \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e; to trace a specific leak, see \u003ca href=\"\/collections\/gas-leak-detectors\" title=\"Gas Leak Detectors\"\u003eGas Leak Detectors\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cblockquote style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:18px 22px;margin:22px 0;color:#f5e6d3;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;font-size:1.05em;\"\u003eEditor's pick for most buyers — an electrochemical or infrared point detector wired to a controller\u003c\/strong\u003e\u003cbr\u003e\n  A fixed point detector for the gas you actually face (electrochemical for toxics\/oxygen, infrared for combustibles) tied to a controller that drives audible\/visual alarms and ventilation relays is the dependable core of a plant system — and it scales head-by-head as the facility grows.\n  \u003cspan style=\"display:block;margin-top:6px;font-size:0.82em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases (tag wcsafety04-20).\u003c\/span\u003e\n  \u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px;\"\u003e\n    \u003ca href=\"\/collections\/gas-detectors\" title=\"BROWSE ALL GAS DETECTORS\" style=\"display:inline-block;background:#ff9800;color:#000;padding:12px 22px;text-decoration:none;font-weight:bold;border-radius:4px;\"\u003eBROWSE ALL GAS DETECTORS →\u003c\/a\u003e\n    \u003ca href=\"https:\/\/www.amazon.com\/s?k=fixed+gas+detector+transmitter+controller\u0026amp;tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:12px 22px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICES ON AMAZON →\u003c\/a\u003e\n  \u003c\/p\u003e\n\u003c\/blockquote\u003e\n\n\u003ch2\u003eWhat this collection covers\u003c\/h2\u003e\n\n\u003cp\u003eFixed systems are built from detector heads and a controller. This collection groups them by detection principle and role:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalytic-bead (pellistor) combustible detectors\u003c\/strong\u003e — the traditional %LEL detector for flammable gases in normal-oxygen atmospheres.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfrared (NDIR) combustible \/ CO2 detectors\u003c\/strong\u003e — immune to sensor poisoning and able to read in low-oxygen or inert atmospheres where pellistors fail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrochemical toxic \/ oxygen detectors\u003c\/strong\u003e — gas-specific heads for CO, H2S, Cl2, NH3, SO2 and oxygen deficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmitters and controllers\u003c\/strong\u003e — the central unit that powers the heads, displays readings, and drives alarm horns, strobes, ventilation and shutdown relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudible \/ visual alarm stations\u003c\/strong\u003e — horns, strobes and remote annunciators tied to the controller.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFixed gas detector sensor technologies compared\u003c\/h2\u003e\n\n\u003cp\u003ePoint-detector technologies compared by gas coverage and behavior. Approximate per-point street-price ranges reflect the broad market, not WC Safety quotes; a full system also needs a controller.\u003c\/p\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:18px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpec\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:10px;border:1px solid #3a3a3a;text-align:left;\"\u003eCatalytic bead\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:10px;border:1px solid #3a3a3a;text-align:left;\"\u003eInfrared (NDIR)\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:10px;border:1px solid #3a3a3a;text-align:left;\"\u003eElectrochemical\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eGases detected\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eCombustibles (%LEL)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eCombustibles \/ CO2\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eToxics \u0026amp; O2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003eWorks in low\/no oxygen\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#e57373;\"\u003e—\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#81c784;\"\u003e✓\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eVaries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003eRisk of sensor poisoning\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eHigher\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eNone\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eLower\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eDetects specific toxic gas\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#e57373;\"\u003e—\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#e57373;\"\u003e—\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#81c784;\"\u003e✓\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eTypical drift \/ calibration\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003ePeriodic\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eLow drift\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003ePeriodic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eHazardous-area versions\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#81c784;\"\u003e✓\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#81c784;\"\u003e✓\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e\u003cspan style=\"color:#81c784;\"\u003e✓\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003eApprox. per-point price\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e$300–800\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e$800–2,000\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:10px;border:1px solid #3a3a3a;\"\u003e$300–1,200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhich fixed gas detection approach fits your facility?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse catalytic-bead heads\u003c\/strong\u003e for general combustible-gas monitoring in normal-oxygen areas where cost matters and poisoning risk is low.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse infrared (NDIR) heads\u003c\/strong\u003e for combustibles where the atmosphere may be oxygen-deficient or inert, or where silicones\/sulphur would poison a pellistor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse electrochemical heads\u003c\/strong\u003e for specific toxic gases (CO, H2S, Cl2, NH3, SO2) and oxygen-deficiency monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize the controller for growth\u003c\/strong\u003e — pick a controller with spare channels and the relay outputs you need for ventilation and shutdown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed temporary coverage during a turnaround?\u003c\/strong\u003e Use relocatable \u003ca href=\"\/collections\/area-gas-monitors\" title=\"area gas monitors\"\u003earea gas monitors\u003c\/a\u003e rather than installing fixed heads for a short job.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:14px 0 18px 0;padding:12px 16px;background:#1a1a1a;border-radius:4px;\"\u003e\u003cstrong style=\"color:#ffb74d;font-size:0.9em;\"\u003eShop fixed gas detection equipment on Amazon →\u003c\/strong\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/s?k=fixed+combustible+gas+detector\u0026amp;tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:7px 12px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;font-size:0.85em;\"\u003eCombustible detector\u003c\/a\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/s?k=fixed+co+gas+detector+transmitter\u0026amp;tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:7px 12px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;font-size:0.85em;\"\u003eCO transmitter\u003c\/a\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/s?k=fixed+h2s+gas+detector\u0026amp;tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:7px 12px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;font-size:0.85em;\"\u003eH2S detector\u003c\/a\u003e\n  \u003ca href=\"https:\/\/www.amazon.com\/s?k=gas+detection+controller+panel\u0026amp;tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:7px 12px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;font-size:0.85em;\"\u003eController \/ panel\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003ch2\u003eHow to choose a fixed gas detection system\u003c\/h2\u003e\u003ch3\u003eStart from the gas and the sensor\u003c\/h3\u003e\u003cp\u003eList every gas the area can release, then pick the right principle for each: catalytic or infrared for combustibles, electrochemical for toxics and oxygen. Infrared is the choice where poisoning or low oxygen rules out a pellistor.\u003c\/p\u003e\u003ch3\u003ePlace detectors by gas density\u003c\/h3\u003e\u003cp\u003eMount heads low for gases heavier than air (such as propane or H2S), high for lighter-than-air gases (such as methane or hydrogen), and near the breathing zone for toxics. Position them between sources and where people work or enter.\u003c\/p\u003e\u003ch3\u003eMatch the area classification\u003c\/h3\u003e\u003cp\u003eIn flammable atmospheres, specify detectors and controllers rated for the hazardous-area classification (e.g. Class I, Division 1 or 2). Confirm wiring methods meet the classification too.\u003c\/p\u003e\u003ch3\u003ePlan alarm and control outputs\u003c\/h3\u003e\u003cp\u003eDecide what each alarm level does — horn and strobe, ventilation start, or process shutdown — and size the controller’s relays accordingly. Add remote annunciators where the controller isn’t visible.\u003c\/p\u003e\u003ch3\u003eCalibration and lifecycle\u003c\/h3\u003e\u003cp\u003eFixed heads need scheduled calibration with certified gas and periodic sensor replacement. Budget for calibration access, gas, and a sensor-replacement cycle measured in years.\u003c\/p\u003e\n\n\u003ch2\u003eFixed gas detection, OSHA and area classification\u003c\/h2\u003e\u003cp\u003eFixed systems support compliance with OSHA general-industry requirements for oxygen and toxic-gas hazards, and with confined-space rules where a space is monitored continuously rather than tested per entry. Detectors and controllers in flammable atmospheres must match the electrical area classification, and combustible alarms are typically set at 10% and 20% of the LEL. Fixed detection protects the space; workers still need \u003ca href=\"\/collections\/respiratory-protection\" title=\"respiratory protection\"\u003erespiratory protection\u003c\/a\u003e and, where fire is a risk, \u003ca href=\"\/collections\/fire-extinguishers\" title=\"fire extinguishers\"\u003efire extinguishers\u003c\/a\u003e on hand.\u003c\/p\u003e\n\n\u003ch2 id=\"related\"\u003eRelated gas-detection categories\u003c\/h2\u003e\n\u003cp\u003eThis collection is one of five form-factor hubs under \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e. Match the form factor to how the instrument is used, then narrow by the gases you need to detect:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e — Handheld single- and multi-gas instruments for spot checks, confined-space entry, and leak surveys.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e — Clip-on monitors worn in the breathing zone for single-worker exposure alarms.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e — Transportable multi-gas monitors for perimeter and multi-zone temporary coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/gas-leak-detectors\" title=\"Gas Leak Detectors\"\u003eGas Leak Detectors\u003c\/a\u003e — Handheld sniffers that pinpoint combustible and refrigerant leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/gas-detectors\" title=\"All Gas Detectors\"\u003eAll Gas Detectors\u003c\/a\u003e — the full gas-detection hub.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is a fixed gas detection system?\u003c\/h3\u003e\u003cp\u003eA permanently installed system of one or more detector heads wired to a controller that monitors an area continuously and drives alarms, ventilation or shutdowns when gas is detected — no operator present.\u003c\/p\u003e\n\u003ch3\u003eCatalytic bead vs infrared combustible detector — which is better?\u003c\/h3\u003e\u003cp\u003eCatalytic-bead (pellistor) detectors are lower cost and suit normal-oxygen areas; infrared (NDIR) detectors cost more but resist poisoning and work in oxygen-deficient or inert atmospheres. Choose infrared where poisoning or low oxygen is a concern.\u003c\/p\u003e\n\u003ch3\u003eWhere should fixed gas detectors be mounted?\u003c\/h3\u003e\u003cp\u003eBy gas density: low for heavier-than-air gases like propane and H2S, high for lighter-than-air gases like methane and hydrogen, and near the breathing zone for toxics — positioned between likely sources and occupied areas.\u003c\/p\u003e\n\u003ch3\u003eWhat is a gas detection controller?\u003c\/h3\u003e\u003cp\u003eThe central unit that powers the detector heads, displays readings, logs data and drives outputs — alarm horns, strobes, ventilation relays and shutdown contacts. Sizing it with spare channels lets the system grow.\u003c\/p\u003e\n\u003ch3\u003eDo fixed gas detectors need to be intrinsically safe or explosion-proof?\u003c\/h3\u003e\u003cp\u003eIn classified (flammable) areas, yes — specify detectors and controllers rated for the area classification, with wiring methods to match. In ordinary areas, standard-rated equipment is acceptable.\u003c\/p\u003e\n\u003ch3\u003eHow often do fixed gas detectors need calibration?\u003c\/h3\u003e\u003cp\u003eOn the manufacturer’s schedule, typically every few months to annually with certified calibration gas, plus periodic sensor replacement measured in years. Design for easy calibration access when you place the heads.\u003c\/p\u003e\n\u003ch3\u003eWhat gases can a fixed system detect?\u003c\/h3\u003e\u003cp\u003eCombustibles (%LEL) via catalytic or infrared sensors, CO2 via infrared, and specific toxics and oxygen via electrochemical sensors — CO, H2S, Cl2, NH3, SO2 and more, one head per gas.\u003c\/p\u003e\n\u003ch3\u003eCan a fixed system replace portable detectors for confined spaces?\u003c\/h3\u003e\u003cp\u003eA continuously monitored space may use fixed detection, but pre-entry testing of most permit spaces still calls for a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"portable gas detector\"\u003eportable gas detector\u003c\/a\u003e. The two layers complement each other.\u003c\/p\u003e\n\u003ch3\u003eWhat is the difference between a fixed system and an area monitor?\u003c\/h3\u003e\u003cp\u003eA fixed system is hard-wired and permanent; an \u003ca href=\"\/collections\/area-gas-monitors\" title=\"area gas monitor\"\u003earea gas monitor\u003c\/a\u003e is transportable and battery- or solar-powered for temporary coverage during a project or turnaround.\u003c\/p\u003e\n\u003ch3\u003eWhat do the LEL alarm set points mean on a fixed system?\u003c\/h3\u003e\u003cp\u003eCombustible alarms are set as a percentage of the Lower Explosive Limit — commonly a low alarm at 10% LEL and a high alarm at 20% LEL — so action is taken well below the explosive concentration.\u003c\/p\u003e\n\u003ch3\u003eHow many detectors does a facility need?\u003c\/h3\u003e\u003cp\u003eEnough to cover every credible release point and occupied or entry area, placed by gas density and airflow. A controller with spare channels lets you add heads as the facility changes.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this fixed gas detection system collection?\u003c\/strong\u003e WC Safety is an independent industrial PPE and safety-equipment retailer serving safety managers, procurement teams, and field supervisors. This collection is curated by our editorial desk on the basis of detection principle, target-gas coverage, certification, and real-world fit — not by manufacturer input or paid placement. Selection guidance is grounded in published OSHA standards, manufacturer instrument data, and recognized industrial-hygiene references. Disclosed: WC Safety earns Amazon affiliate commissions on outbound links; that does not influence what we recommend or how we rank it.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eCurated by Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, confined-space gas detection, and chemical-specific instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast reviewed:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e OSHA 29 CFR 1910 general-industry standards, OSHA 29 CFR 1910.146, NFPA hazardous-area classification practice, ACGIH Threshold Limit Values, and manufacturer instrument data sheets\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Lineup curated on detection performance, certification, and application fit — not vendor preference.\u003c\/em\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this fixed gas detection system collection is curated.\u003c\/strong\u003e We map each instrument class to its detection principle (electrochemical, catalytic bead\/pellistor, infrared\/NDIR, or photoionization), the gases it covers, and the standard governing its use — primarily \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e for permit-required confined spaces and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e for toxic-gas thresholds, cross-referenced with ACGIH Threshold Limit Values. Reviewed quarterly and whenever OSHA guidance or the manufacturer lineup changes.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases made through outbound links on this page (partner tag \u003ccode\u003ewcsafety04-20\u003c\/code\u003e). We are not sponsored by any instrument manufacturer, and affiliate relationships do not influence inclusion or ranking. This page is buyer guidance, not medical, legal, or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"CollectionPage\",\n      \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\",\n      \"name\": \"Fixed Gas Detection Systems\",\n      \"description\": \"Shop fixed gas detection systems for continuous plant monitoring: catalytic, infrared and electrochemical point detectors, transmitters and controllers.\",\n      \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\",\n      \"isPartOf\": {\n        \"@type\": \"WebSite\",\n        \"name\": \"WC Safety\",\n        \"url\": \"https:\/\/wcsafety.com\"\n      },\n      \"breadcrumb\": {\n        \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#breadcrumb\"\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is a fixed gas detection system?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A permanently installed system of one or more detector heads wired to a controller that monitors an area continuously and drives alarms, ventilation or shutdowns when gas is detected — no operator present.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Catalytic bead vs infrared combustible detector — which is better?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Catalytic-bead (pellistor) detectors are lower cost and suit normal-oxygen areas; infrared (NDIR) detectors cost more but resist poisoning and work in oxygen-deficient or inert atmospheres. Choose infrared where poisoning or low oxygen is a concern.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Where should fixed gas detectors be mounted?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"By gas density: low for heavier-than-air gases like propane and H2S, high for lighter-than-air gases like methane and hydrogen, and near the breathing zone for toxics — positioned between likely sources and occupied areas.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is a gas detection controller?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"The central unit that powers the detector heads, displays readings, logs data and drives outputs — alarm horns, strobes, ventilation relays and shutdown contacts. Sizing it with spare channels lets the system grow.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Do fixed gas detectors need to be intrinsically safe or explosion-proof?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"In classified (flammable) areas, yes — specify detectors and controllers rated for the area classification, with wiring methods to match. In ordinary areas, standard-rated equipment is acceptable.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How often do fixed gas detectors need calibration?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"On the manufacturer's schedule, typically every few months to annually with certified calibration gas, plus periodic sensor replacement measured in years. Design for easy calibration access when you place the heads.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What gases can a fixed system detect?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Combustibles (%LEL) via catalytic or infrared sensors, CO2 via infrared, and specific toxics and oxygen via electrochemical sensors — CO, H2S, Cl2, NH3, SO2 and more, one head per gas.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can a fixed system replace portable detectors for confined spaces?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A continuously monitored space may use fixed detection, but pre-entry testing of most permit spaces still calls for a portable gas detector. The two layers complement each other.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between a fixed system and an area monitor?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"A fixed system is hard-wired and permanent; an area gas monitor is transportable and battery- or solar-powered for temporary coverage during a project or turnaround.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What do the LEL alarm set points mean on a fixed system?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Combustible alarms are set as a percentage of the Lower Explosive Limit — commonly a low alarm at 10% LEL and a high alarm at 20% LEL — so action is taken well below the explosive concentration.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How many detectors does a facility need?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Enough to cover every credible release point and occupied or entry area, placed by gas density and airflow. A controller with spare channels lets you add heads as the facility changes.\"\n          }\n        }\n      ]\n    },\n    {\n      \"@type\": \"BreadcrumbList\",\n      \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#breadcrumb\",\n      \"itemListElement\": [\n        {\n          \"@type\": \"ListItem\",\n          \"position\": 1,\n          \"name\": \"Home\",\n          \"item\": \"https:\/\/wcsafety.com\/\"\n        },\n        {\n          \"@type\": \"ListItem\",\n          \"position\": 2,\n          \"name\": \"Gas Detectors\",\n          \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"\n        },\n        {\n          \"@type\": \"ListItem\",\n          \"position\": 3,\n          \"name\": \"Fixed Gas Detection Systems\"\n        }\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","products":[{"product_id":"forensics-ex-lel-gas-detector-wall-mount","title":"Forensics EX LEL Gas Detector — Wall-Mount Industrial (0-100% LEL, Relay Output)","description":"\u003c!-- PRODUCT B081PMHDPW | tag fixed-gas-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the Forensics EX LEL gas detector is one of the instruments we curate in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Wall-Mount\"\u003eForensics Hydrogen Wall-Mount\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eForensics EX LEL Gas Detector — Wall-Mount Combustible Monitor\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eForensics EX LEL gas detector\u003c\/strong\u003e is a wall-mounted, continuously-monitoring combustible head reading 0-100% LEL — a \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"fixed gas detection system\"\u003efixed gas detection system\u003c\/a\u003e that drives ventilation or shutdown through its relay output. It protects an unattended space around the clock, where a carried instrument cannot.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Forensics EX LEL Gas Detector is a wall-mounted fixed combustible-gas monitor (0-100% LEL) with relay output, adjustable alarms and NIST-traceable calibration for continuous unattended monitoring.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eContinuously monitors combustible gas across 0-100% LEL on a fixed wall-mounted head\u003c\/li\u003e\n\u003cli\u003eRelay output drives ventilation, alarms or shutdown when gas is detected\u003c\/li\u003e\n\u003cli\u003eAdjustable audible and visual alarms set to your action levels\u003c\/li\u003e\n\u003cli\u003eUSA NIST-traceable calibration for documented accuracy\u003c\/li\u003e\n\u003cli\u003eRugged aluminum industrial enclosure for plant environments\u003c\/li\u003e\n\u003cli\u003eAlways-on protection for an unattended space\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eContinuous unattended LEL monitoring\u003c\/li\u003e\n\u003cli\u003eRelay output for ventilation\/shutdown\u003c\/li\u003e\n\u003cli\u003e0-100% LEL full range\u003c\/li\u003e\n\u003cli\u003eNIST-traceable calibration\u003c\/li\u003e\n\u003cli\u003eRugged aluminum enclosure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eSingle point coverage (one unit per area)\u003c\/li\u003e\n\u003cli\u003eCombustible gases only (no toxics\/O2)\u003c\/li\u003e\n\u003cli\u003eHard-wired install required\u003c\/li\u003e\n\u003cli\u003eNot portable — for a carried check use a handheld\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eGas detected\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eCombustible gases (EX), 0-100% LEL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eWall-mount, fixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMonitoring\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eContinuous (always on)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eOutput\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eRelay output + adjustable sound \u0026amp; light alarms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eCalibration\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eUSA NIST-traceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eEnclosure\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eAluminum, industrial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eCorded (mains)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e3 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Forensics EX LEL Gas Detector fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eBoiler and mechanical rooms\u003c\/li\u003e\n\u003cli\u003eCompressor and pump houses\u003c\/li\u003e\n\u003cli\u003eLPG\/natural-gas storage and use areas\u003c\/li\u003e\n\u003cli\u003ePaint and solvent areas\u003c\/li\u003e\n\u003cli\u003eAny space needing continuous combustible monitoring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Forensics EX LEL Gas Detector detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eThis head monitors \u003cstrong\u003ecombustible gases as %LEL\u003c\/strong\u003e — not toxics, oxygen or refrigerants. For toxic or oxygen monitoring choose the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount Monitor\"\u003eForensics 4 Gas Wall-Mount Monitor\u003c\/a\u003e; for hydrogen specifically, the \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Detector\"\u003eForensics Hydrogen Detector\u003c\/a\u003e. Mount combustible heads per the gas density — high for lighter-than-air gases like methane, lower for heavier propane. Its relay output ties into ventilation or shutdown. A fixed head protects the space; entrants still need a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument for pre-entry testing and a \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e clip during work.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Wall-Mount\"\u003eForensics Hydrogen Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount\"\u003eForensics 4 Gas Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eForensics fixed wall-mount family compared\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eForensics Detectors fixed wall-mount family (continuous monitoring, relay output, NIST-traceable)\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eGas(es)\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eRange\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eOutput\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCombustibles (EX)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-100% LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$599\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eHydrogen (H2)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-1000 ppm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$799\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCO, H2S, O2, EX LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMulti-gas\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$1,395\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003eEX LEL Detector\u003c\/strong\u003e for continuous combustible-gas monitoring of a single area.\u003c\/li\u003e\n\u003cli\u003eNeed toxics and oxygen too? Use the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Wall-Mount Monitor\"\u003e4 Gas Wall-Mount Monitor\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eMonitoring a battery room? The \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e is purpose-built.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat does the Forensics EX LEL gas detector monitor?\u003c\/h3\u003e\u003cp\u003eCombustible gases across 0-100% LEL, continuously, from a fixed wall-mounted position. It does not detect toxics, oxygen or refrigerants.\u003c\/p\u003e\n\u003ch3\u003eWhat is the relay output for?\u003c\/h3\u003e\u003cp\u003eThe relay lets the detector trigger external action when gas is detected — starting ventilation, sounding a remote alarm, or shutting down equipment.\u003c\/p\u003e\n\u003ch3\u003eWhere should I mount a combustible gas detector?\u003c\/h3\u003e\u003cp\u003eBy gas density — high on the wall for lighter-than-air gases like methane and hydrogen, lower for heavier gases like propane — and between likely release points and occupied areas.\u003c\/p\u003e\n\u003ch3\u003eIs it NIST calibrated?\u003c\/h3\u003e\u003cp\u003eYes — it ships with USA NIST-traceable calibration. Plan periodic recalibration with combustible calibration gas to keep readings accurate.\u003c\/p\u003e\n\u003ch3\u003eDoes it run continuously?\u003c\/h3\u003e\u003cp\u003eYes — it is a mains-powered fixed head designed for continuous, unattended monitoring, unlike a carried portable instrument.\u003c\/p\u003e\n\u003ch3\u003eCan it replace a portable detector for confined-space entry?\u003c\/h3\u003e\u003cp\u003eNo — pre-entry testing of a space still needs a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument. A fixed head provides ongoing monitoring of the installed area.\u003c\/p\u003e\n\u003ch3\u003eHow many detectors do I need?\u003c\/h3\u003e\u003cp\u003eOne head covers one area near its release points; larger or multi-room spaces need additional heads positioned by airflow and gas density.\u003c\/p\u003e\n\u003ch3\u003eWhat alarms does it have?\u003c\/h3\u003e\u003cp\u003eAdjustable audible and visual alarms, plus the relay output for external devices. Set the action levels to your site's requirements (combustibles often alarm at 10% and 20% LEL).\u003c\/p\u003e\n\u003ch3\u003eDoes it detect carbon monoxide or hydrogen sulfide?\u003c\/h3\u003e\u003cp\u003eNo — it is combustible-only. For CO, H2S and O2 use the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount Monitor\"\u003eForensics 4 Gas Wall-Mount Monitor\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eDoes installation require an electrician?\u003c\/h3\u003e\u003cp\u003eIt is a hard-wired mains device, so installation and relay wiring should follow local electrical code and, in classified areas, the area-classification wiring methods.\u003c\/p\u003e\n\u003ch3\u003eCan I tie it to building ventilation?\u003c\/h3\u003e\u003cp\u003eYes — that is a primary use of the relay output: energise exhaust fans or a shutdown circuit automatically when combustible gas reaches the alarm level.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eForensics EX LEL gas detector\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B081PMHDPW?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this Forensics Detectors page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Forensics EX LEL Gas Detector and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount#product\", \"name\": \"Forensics EX LEL Gas Detector — Wall-Mount Industrial (0-100% LEL, Relay Output)\", \"description\": \"Forensics EX LEL gas detector — wall-mount industrial combustible monitor, 0-100% LEL, continuous monitoring with relay output and NIST-traceable calibration.\", \"sku\": \"B081PMHDPW\", \"mpn\": \"FD-EXLEL\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/forensics-ex-lel-gas-detector-wall-mount.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}, \"category\": \"Fixed Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\", \"name\": \"Fixed Gas Detection Systems\", \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics Hydrogen Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics 4 Gas Wall-Mount Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco PM100-CO Fixed CO Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco GBC-24-2 Gas Detection Controller\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount\", \"priceCurrency\": \"USD\", \"price\": \"599.45\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Fixed Gas Detection Systems\", \"item\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Forensics EX LEL Gas Detector — Wall-Mount Industrial (0-100% LEL, Relay Output)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the Forensics EX LEL gas detector monitor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Combustible gases across 0-100% LEL, continuously, from a fixed wall-mounted position. It does not detect toxics, oxygen or refrigerants.\"}}, {\"@type\": \"Question\", \"name\": \"What is the relay output for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The relay lets the detector trigger external action when gas is detected — starting ventilation, sounding a remote alarm, or shutting down equipment.\"}}, {\"@type\": \"Question\", \"name\": \"Where should I mount a combustible gas detector?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"By gas density — high on the wall for lighter-than-air gases like methane and hydrogen, lower for heavier gases like propane — and between likely release points and occupied areas.\"}}, {\"@type\": \"Question\", \"name\": \"Is it NIST calibrated?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it ships with USA NIST-traceable calibration. Plan periodic recalibration with combustible calibration gas to keep readings accurate.\"}}, {\"@type\": \"Question\", \"name\": \"Does it run continuously?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it is a mains-powered fixed head designed for continuous, unattended monitoring, unlike a carried portable instrument.\"}}, {\"@type\": \"Question\", \"name\": \"Can it replace a portable detector for confined-space entry?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — pre-entry testing of a space still needs a Portable Gas Detectors instrument. A fixed head provides ongoing monitoring of the installed area.\"}}, {\"@type\": \"Question\", \"name\": \"How many detectors do I need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One head covers one area near its release points; larger or multi-room spaces need additional heads positioned by airflow and gas density.\"}}, {\"@type\": \"Question\", \"name\": \"What alarms does it have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Adjustable audible and visual alarms, plus the relay output for external devices. Set the action levels to your site's requirements (combustibles often alarm at 10% and 20% LEL).\"}}, {\"@type\": \"Question\", \"name\": \"Does it detect carbon monoxide or hydrogen sulfide?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it is combustible-only. For CO, H2S and O2 use the Forensics 4 Gas Wall-Mount Monitor.\"}}, {\"@type\": \"Question\", \"name\": \"Is it in stock and how does it ship?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.\"}}, {\"@type\": \"Question\", \"name\": \"Does installation require an electrician?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is a hard-wired mains device, so installation and relay wiring should follow local electrical code and, in classified areas, the area-classification wiring methods.\"}}, {\"@type\": \"Question\", \"name\": \"Can I tie it to building ventilation?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — that is a primary use of the relay output: energise exhaust fans or a shutdown circuit automatically when combustible gas reaches the alarm level.\"}}]}, {\"@type\": \"Organization\", \"@id\": \"https:\/\/wcsafety.com\/#org\", \"name\": \"WC Safety\", \"url\": \"https:\/\/wcsafety.com\", \"logo\": \"https:\/\/wcsafety.com\/cdn\/shop\/files\/logo.png\"}, {\"@type\": \"Person\", \"@id\": \"https:\/\/wcsafety.com\/#editor\", \"name\": \"Steven Eaton\", \"jobTitle\": \"Editorial Lead\", \"worksFor\": {\"@id\": \"https:\/\/wcsafety.com\/#org\"}, \"knowsAbout\": [\"industrial gas detection\", \"atmospheric monitoring\", \"personal protective equipment\"]}, {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}]}\n\u003c\/script\u003e","brand":"Forensics Detectors","offers":[{"title":"Default Title","offer_id":44266496819288,"sku":"B081PMHDPW","price":599.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/7173Jw9UUQL._AC_SL1500.jpg?v=1782122841"},{"product_id":"forensics-hydrogen-gas-detector-wall-mount","title":"Forensics Hydrogen Gas Detector — Wall-Mount for Battery Rooms (0-1000 ppm)","description":"\u003c!-- PRODUCT B08GZKR3V9 | tag fixed-gas-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the Forensics hydrogen gas detector is one of the instruments we curate in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eForensics Hydrogen Gas Detector — Wall-Mount Battery-Room Monitor\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eForensics hydrogen gas detector\u003c\/strong\u003e is a wall-mounted H2 monitor built for battery and UPS rooms, reading 0-1000 ppm continuously — a \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"fixed gas detection system\"\u003efixed gas detection system\u003c\/a\u003e that triggers exhaust ventilation before charging-battery hydrogen reaches a dangerous level.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Forensics Hydrogen Gas Detector is a wall-mounted fixed H2 monitor (0-1000 ppm) for battery and UPS rooms, with relay output, adjustable alarms and NIST-traceable calibration.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eMonitors hydrogen (H2) from 0-1000 ppm — purpose-built for battery and UPS rooms\u003c\/li\u003e\n\u003cli\u003eContinuous wall-mounted monitoring where charging batteries off-gas hydrogen\u003c\/li\u003e\n\u003cli\u003eRelay output drives exhaust ventilation before H2 reaches an explosive level\u003c\/li\u003e\n\u003cli\u003eAdjustable audible and visual alarms\u003c\/li\u003e\n\u003cli\u003eUSA NIST-traceable calibration\u003c\/li\u003e\n\u003cli\u003eRugged aluminum enclosure for equipment rooms\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003ePurpose-built for battery\/UPS rooms\u003c\/li\u003e\n\u003cli\u003eContinuous H2 monitoring 0-1000 ppm\u003c\/li\u003e\n\u003cli\u003eRelay output for exhaust ventilation\u003c\/li\u003e\n\u003cli\u003eNIST-traceable calibration\u003c\/li\u003e\n\u003cli\u003eRugged aluminum enclosure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eHydrogen only (single gas)\u003c\/li\u003e\n\u003cli\u003eSingle point coverage\u003c\/li\u003e\n\u003cli\u003eHard-wired install required\u003c\/li\u003e\n\u003cli\u003eNot portable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eGas detected\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eHydrogen (H2), 0-1000 ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eBattery \/ UPS \/ charging rooms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eWall-mount, fixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMonitoring\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eContinuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eOutput\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eRelay output + adjustable alarms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eCalibration\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eUSA NIST-traceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eEnclosure\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e3.54 x 7.09 x 7.87 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Forensics Hydrogen Gas Detector fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eUPS and data-center battery rooms\u003c\/li\u003e\n\u003cli\u003eForklift and EV charging areas\u003c\/li\u003e\n\u003cli\u003eTelecom battery plants\u003c\/li\u003e\n\u003cli\u003eBackup-power battery banks\u003c\/li\u003e\n\u003cli\u003eAny space where lead-acid batteries off-gas hydrogen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Forensics Hydrogen Gas Detector detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eThis head monitors \u003cstrong\u003ehydrogen (H2) only\u003c\/strong\u003e — the gas lead-acid batteries off-gas while charging. It does not detect CO, combustibles broadly, or oxygen. Because hydrogen is lighter than air, mount it high, near the ceiling above the battery banks. Its relay output should drive the room exhaust fans. For combustible monitoring elsewhere use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX LEL Detector\"\u003eForensics EX LEL Detector\u003c\/a\u003e; for multi-gas areas the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Wall-Mount Monitor\"\u003e4 Gas Wall-Mount Monitor\u003c\/a\u003e. A fixed head protects the room; technicians entering still benefit from a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount\"\u003eForensics 4 Gas Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eForensics fixed wall-mount family compared\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eForensics Detectors fixed wall-mount family (continuous monitoring, relay output, NIST-traceable)\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eGas(es)\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eRange\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eOutput\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCombustibles (EX)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-100% LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$599\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eHydrogen (H2)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-1000 ppm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$799\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCO, H2S, O2, EX LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMulti-gas\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$1,395\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003eHydrogen Detector\u003c\/strong\u003e for battery, UPS and charging rooms where H2 off-gassing is the hazard.\u003c\/li\u003e\n\u003cli\u003eFor general combustible monitoring use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eFor CO, H2S, O2 and combustibles together, use the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Wall-Mount Monitor\"\u003e4 Gas Wall-Mount Monitor\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhy do battery rooms need a hydrogen detector?\u003c\/h3\u003e\u003cp\u003eCharging lead-acid batteries release hydrogen, which is explosive at high concentrations. A fixed H2 detector triggers ventilation before levels become dangerous.\u003c\/p\u003e\n\u003ch3\u003eWhat range does the Forensics hydrogen detector cover?\u003c\/h3\u003e\u003cp\u003e0-1000 ppm of hydrogen, continuously monitored from a fixed wall-mounted head with relay output for ventilation.\u003c\/p\u003e\n\u003ch3\u003eWhere should a hydrogen detector be mounted?\u003c\/h3\u003e\u003cp\u003eHigh on the wall or near the ceiling above the battery banks — hydrogen is lighter than air and collects at the top of the room.\u003c\/p\u003e\n\u003ch3\u003eCan the detector control the exhaust fans?\u003c\/h3\u003e\u003cp\u003eYes — its relay output is designed to energise room exhaust ventilation automatically when hydrogen reaches the alarm set point.\u003c\/p\u003e\n\u003ch3\u003eIs it NIST calibrated?\u003c\/h3\u003e\u003cp\u003eYes — it ships with USA NIST-traceable calibration; recalibrate periodically with hydrogen calibration gas.\u003c\/p\u003e\n\u003ch3\u003eDoes it detect other gases?\u003c\/h3\u003e\u003cp\u003eNo — it is hydrogen-specific. For combustibles use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e; for CO\/H2S\/O2\/EX the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs one detector enough for a battery room?\u003c\/h3\u003e\u003cp\u003eOne head covers a typical room near the battery banks; larger rooms or multiple banks may need additional heads positioned where hydrogen accumulates.\u003c\/p\u003e\n\u003ch3\u003eDoes it run continuously?\u003c\/h3\u003e\u003cp\u003eYes — it is a mains-powered fixed monitor for continuous, unattended operation.\u003c\/p\u003e\n\u003ch3\u003eIs it suitable for data centers and telecom?\u003c\/h3\u003e\u003cp\u003eYes — UPS and telecom battery plants are primary applications, where continuous H2 monitoring protects equipment rooms.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eDoes installation need an electrician?\u003c\/h3\u003e\u003cp\u003eIt is hard-wired, so installation and relay-to-ventilation wiring should follow local electrical code.\u003c\/p\u003e\n\u003ch3\u003eWhat alarms does it have?\u003c\/h3\u003e\u003cp\u003eAdjustable audible and visual alarms plus the relay output, so you can set action levels and tie in ventilation and remote annunciation.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eForensics hydrogen gas detector\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B08GZKR3V9?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this Forensics Detectors page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Forensics Hydrogen Gas Detector and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount#product\", \"name\": \"Forensics Hydrogen Gas Detector — Wall-Mount for Battery Rooms (0-1000 ppm)\", \"description\": \"Forensics hydrogen gas detector — wall-mount H2 monitor for battery rooms, 0-1000 ppm, continuous monitoring with relay output and NIST-traceable calibration.\", \"sku\": \"B08GZKR3V9\", \"mpn\": \"FD-H2\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/forensics-hydrogen-gas-detector-wall-mount.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}, \"category\": \"Fixed Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\", \"name\": \"Fixed Gas Detection Systems\", \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics EX LEL Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics 4 Gas Wall-Mount Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco PM100-CO Fixed CO Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco GBC-24-2 Gas Detection Controller\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount\", \"priceCurrency\": \"USD\", \"price\": \"799.45\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Fixed Gas Detection Systems\", \"item\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Forensics Hydrogen Gas Detector — Wall-Mount for Battery Rooms (0-1000 ppm)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why do battery rooms need a hydrogen detector?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Charging lead-acid batteries release hydrogen, which is explosive at high concentrations. A fixed H2 detector triggers ventilation before levels become dangerous.\"}}, {\"@type\": \"Question\", \"name\": \"What range does the Forensics hydrogen detector cover?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"0-1000 ppm of hydrogen, continuously monitored from a fixed wall-mounted head with relay output for ventilation.\"}}, {\"@type\": \"Question\", \"name\": \"Where should a hydrogen detector be mounted?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"High on the wall or near the ceiling above the battery banks — hydrogen is lighter than air and collects at the top of the room.\"}}, {\"@type\": \"Question\", \"name\": \"Can the detector control the exhaust fans?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — its relay output is designed to energise room exhaust ventilation automatically when hydrogen reaches the alarm set point.\"}}, {\"@type\": \"Question\", \"name\": \"Is it NIST calibrated?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it ships with USA NIST-traceable calibration; recalibrate periodically with hydrogen calibration gas.\"}}, {\"@type\": \"Question\", \"name\": \"Does it detect other gases?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it is hydrogen-specific. For combustibles use the EX LEL Detector; for CO\/H2S\/O2\/EX the 4 Gas Monitor.\"}}, {\"@type\": \"Question\", \"name\": \"Is one detector enough for a battery room?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One head covers a typical room near the battery banks; larger rooms or multiple banks may need additional heads positioned where hydrogen accumulates.\"}}, {\"@type\": \"Question\", \"name\": \"Does it run continuously?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it is a mains-powered fixed monitor for continuous, unattended operation.\"}}, {\"@type\": \"Question\", \"name\": \"Is it suitable for data centers and telecom?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — UPS and telecom battery plants are primary applications, where continuous H2 monitoring protects equipment rooms.\"}}, {\"@type\": \"Question\", \"name\": \"Is it in stock and how does it ship?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.\"}}, {\"@type\": \"Question\", \"name\": \"Does installation need an electrician?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is hard-wired, so installation and relay-to-ventilation wiring should follow local electrical code.\"}}, {\"@type\": \"Question\", \"name\": \"What alarms does it have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Adjustable audible and visual alarms plus the relay output, so you can set action levels and tie in ventilation and remote annunciation.\"}}]}, {\"@type\": \"Organization\", \"@id\": \"https:\/\/wcsafety.com\/#org\", \"name\": \"WC Safety\", \"url\": \"https:\/\/wcsafety.com\", \"logo\": \"https:\/\/wcsafety.com\/cdn\/shop\/files\/logo.png\"}, {\"@type\": \"Person\", \"@id\": \"https:\/\/wcsafety.com\/#editor\", \"name\": \"Steven Eaton\", \"jobTitle\": \"Editorial Lead\", \"worksFor\": {\"@id\": \"https:\/\/wcsafety.com\/#org\"}, \"knowsAbout\": [\"industrial gas detection\", \"atmospheric monitoring\", \"personal protective equipment\"]}, {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}]}\n\u003c\/script\u003e","brand":"Forensics Detectors","offers":[{"title":"Default Title","offer_id":44266496983128,"sku":"B08GZKR3V9","price":799.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/71roKuXhmsL._AC_SL1500.jpg?v=1782122845"},{"product_id":"forensics-4-gas-wall-mount-monitor","title":"Forensics 4 Gas Wall-Mount Monitor — CO, H2S, O2 \u0026 LEL (Relay Output)","description":"\u003c!-- PRODUCT B0C19GM4XC | tag fixed-gas-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the Forensics 4 gas wall-mount monitor is one of the instruments we curate in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eForensics 4 Gas Wall-Mount Monitor — Fixed CO, H2S, O2 \u0026amp; LEL\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eForensics 4 gas wall-mount monitor\u003c\/strong\u003e reads CO, H2S, O2 and combustible LEL from a single fixed head — a \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"fixed gas detection system\"\u003efixed gas detection system\u003c\/a\u003e that covers all four atmospheric hazards continuously and drives ventilation or shutdown through its relay output.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Forensics 4 Gas Wall-Mount Monitor is a fixed, continuously-monitoring detector for CO, H2S, O2 and combustible LEL, with relay output and NIST-traceable calibration.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eMonitors all four atmospheric hazards — CO, H2S, O2 and combustible LEL — from one fixed head\u003c\/li\u003e\n\u003cli\u003eContinuous wall-mounted coverage of an unattended space\u003c\/li\u003e\n\u003cli\u003eRelay output drives ventilation, alarms or shutdown\u003c\/li\u003e\n\u003cli\u003eAdjustable audible and visual alarms per gas\u003c\/li\u003e\n\u003cli\u003eUSA NIST-traceable calibration\u003c\/li\u003e\n\u003cli\u003eThe all-in-one fixed solution where several gases are a risk\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eFour gases from one fixed head\u003c\/li\u003e\n\u003cli\u003eContinuous unattended monitoring\u003c\/li\u003e\n\u003cli\u003eRelay output for ventilation\/shutdown\u003c\/li\u003e\n\u003cli\u003eNIST-traceable calibration\u003c\/li\u003e\n\u003cli\u003eSimplifies multi-gas install\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eHighest cost in the Forensics fixed family\u003c\/li\u003e\n\u003cli\u003eSingle point coverage\u003c\/li\u003e\n\u003cli\u003eHard-wired install required\u003c\/li\u003e\n\u003cli\u003eNot portable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eGases detected\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eCO, H2S, O2, EX (LEL) combustibles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eWall-mount, fixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMonitoring\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eContinuous (always on)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eOutput\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eRelay output + adjustable sound \u0026amp; light alarms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eCalibration\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eUSA NIST-traceable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eEnclosure\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eIndustrial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e3 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Forensics 4 Gas Wall-Mount Monitor fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eWastewater and pump stations\u003c\/li\u003e\n\u003cli\u003eConfined or below-grade plant rooms\u003c\/li\u003e\n\u003cli\u003eParking and loading areas (CO)\u003c\/li\u003e\n\u003cli\u003eDigesters and tanks (H2S, O2)\u003c\/li\u003e\n\u003cli\u003eAny space with multiple gas hazards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Forensics 4 Gas Wall-Mount Monitor detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eThis monitor covers \u003cstrong\u003eCO, H2S, O2 and combustible LEL\u003c\/strong\u003e — the four atmospheric hazards — but not VOCs, CO2 or specific toxics like chlorine. For a single combustible point use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX LEL Detector\"\u003eForensics EX LEL Detector\u003c\/a\u003e; for hydrogen the \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e. Mount it considering each gas’s density and the room layout, and tie the relay into ventilation or shutdown. It protects the installed space; entrants still need a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument for pre-entry testing and a \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e clip during work.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Wall-Mount\"\u003eForensics Hydrogen Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eForensics fixed wall-mount family compared\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eForensics Detectors fixed wall-mount family (continuous monitoring, relay output, NIST-traceable)\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eGas(es)\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eRange\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eOutput\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCombustibles (EX)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-100% LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$599\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eHydrogen (H2)\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e0-1000 ppm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$799\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCO, H2S, O2, EX LEL\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMulti-gas\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eRelay + alarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$1,395\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003e4 Gas Wall-Mount Monitor\u003c\/strong\u003e when a space has several gas hazards and you want one fixed head.\u003c\/li\u003e\n\u003cli\u003eFor combustibles only, the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e costs less.\u003c\/li\u003e\n\u003cli\u003eFor battery-room hydrogen, use the \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat gases does the Forensics 4 gas wall-mount monitor detect?\u003c\/h3\u003e\u003cp\u003eCO, H2S, O2 and combustible LEL — the four atmospheric hazards — continuously, from one fixed head. It does not detect VOCs or specific toxics like chlorine.\u003c\/p\u003e\n\u003ch3\u003eWhy choose a fixed 4-gas monitor over single-gas heads?\u003c\/h3\u003e\u003cp\u003eOne unit covers all four hazards, simplifying installation and wiring where several gases are a risk. For a single hazard, a dedicated head like the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e costs less.\u003c\/p\u003e\n\u003ch3\u003eWhat is the relay output used for?\u003c\/h3\u003e\u003cp\u003eIt triggers external action — ventilation, remote alarms or equipment shutdown — when any monitored gas reaches its set point.\u003c\/p\u003e\n\u003ch3\u003eWhere should it be mounted?\u003c\/h3\u003e\u003cp\u003ePosition it considering each gas's density and the room's release points and occupied zones; below-grade and enclosed plant rooms are common applications.\u003c\/p\u003e\n\u003ch3\u003eIs it NIST calibrated?\u003c\/h3\u003e\u003cp\u003eYes — USA NIST-traceable calibration; plan periodic recalibration of each sensor with the appropriate calibration gas.\u003c\/p\u003e\n\u003ch3\u003eCan it replace portable detectors for entry?\u003c\/h3\u003e\u003cp\u003eNo — pre-entry testing still needs a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument. The fixed monitor provides continuous coverage of the installed space.\u003c\/p\u003e\n\u003ch3\u003eDoes it monitor oxygen deficiency?\u003c\/h3\u003e\u003cp\u003eYes — oxygen is one of its four channels, alarming on deficiency (and typically enrichment) alongside CO, H2S and combustibles.\u003c\/p\u003e\n\u003ch3\u003eHow is it powered and installed?\u003c\/h3\u003e\u003cp\u003eIt is a hard-wired fixed monitor; installation and relay wiring should follow local electrical code and any area-classification requirements.\u003c\/p\u003e\n\u003ch3\u003eWhat does it not detect?\u003c\/h3\u003e\u003cp\u003eVOCs, CO2 and specific toxics such as chlorine or ammonia. For a single combustible point use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e; for hydrogen the \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Hydrogen Detector\"\u003eHydrogen Detector\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eCan it drive building ventilation automatically?\u003c\/h3\u003e\u003cp\u003eYes — that is a core use of the relay output: energise exhaust or a shutdown circuit when gas reaches the alarm level.\u003c\/p\u003e\n\u003ch3\u003eHow many heads does a facility need?\u003c\/h3\u003e\u003cp\u003eOne per area near its release points; larger or multi-room facilities add heads positioned by airflow and gas density, often wired to a central controller.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eForensics 4 gas wall-mount monitor\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B0C19GM4XC?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this Forensics Detectors page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Forensics 4 Gas Wall-Mount Monitor and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor#product\", \"name\": \"Forensics 4 Gas Wall-Mount Monitor — CO, H2S, O2 \u0026 LEL (Relay Output)\", \"description\": \"Forensics 4 gas wall-mount monitor — fixed CO, H2S, O2 \u0026 LEL detector, continuous monitoring with relay output and NIST-traceable calibration.\", \"sku\": \"B0C19GM4XC\", \"mpn\": \"FD-4GWM\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/forensics-4-gas-wall-mount-monitor.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}, \"category\": \"Fixed Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\", \"name\": \"Fixed Gas Detection Systems\", \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics EX LEL Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics Hydrogen Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Macurco PM100-CO Fixed CO Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco GBC-24-2 Gas Detection Controller\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor\", \"priceCurrency\": \"USD\", \"price\": \"1395.00\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Fixed Gas Detection Systems\", \"item\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Forensics 4 Gas Wall-Mount Monitor — CO, H2S, O2 \u0026 LEL (Relay Output)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What gases does the Forensics 4 gas wall-mount monitor detect?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"CO, H2S, O2 and combustible LEL — the four atmospheric hazards — continuously, from one fixed head. It does not detect VOCs or specific toxics like chlorine.\"}}, {\"@type\": \"Question\", \"name\": \"Why choose a fixed 4-gas monitor over single-gas heads?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One unit covers all four hazards, simplifying installation and wiring where several gases are a risk. For a single hazard, a dedicated head like the EX LEL Detector costs less.\"}}, {\"@type\": \"Question\", \"name\": \"What is the relay output used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It triggers external action — ventilation, remote alarms or equipment shutdown — when any monitored gas reaches its set point.\"}}, {\"@type\": \"Question\", \"name\": \"Where should it be mounted?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Position it considering each gas's density and the room's release points and occupied zones; below-grade and enclosed plant rooms are common applications.\"}}, {\"@type\": \"Question\", \"name\": \"Is it NIST calibrated?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — USA NIST-traceable calibration; plan periodic recalibration of each sensor with the appropriate calibration gas.\"}}, {\"@type\": \"Question\", \"name\": \"Can it replace portable detectors for entry?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — pre-entry testing still needs a Portable Gas Detectors instrument. The fixed monitor provides continuous coverage of the installed space.\"}}, {\"@type\": \"Question\", \"name\": \"Does it monitor oxygen deficiency?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — oxygen is one of its four channels, alarming on deficiency (and typically enrichment) alongside CO, H2S and combustibles.\"}}, {\"@type\": \"Question\", \"name\": \"How is it powered and installed?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is a hard-wired fixed monitor; installation and relay wiring should follow local electrical code and any area-classification requirements.\"}}, {\"@type\": \"Question\", \"name\": \"What does it not detect?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"VOCs, CO2 and specific toxics such as chlorine or ammonia. For a single combustible point use the EX LEL Detector; for hydrogen the Hydrogen Detector.\"}}, {\"@type\": \"Question\", \"name\": \"Is it in stock and how does it ship?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.\"}}, {\"@type\": \"Question\", \"name\": \"Can it drive building ventilation automatically?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — that is a core use of the relay output: energise exhaust or a shutdown circuit when gas reaches the alarm level.\"}}, {\"@type\": \"Question\", \"name\": \"How many heads does a facility need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One per area near its release points; larger or multi-room facilities add heads positioned by airflow and gas density, often wired to a central controller.\"}}]}, {\"@type\": \"Organization\", \"@id\": \"https:\/\/wcsafety.com\/#org\", \"name\": \"WC Safety\", \"url\": \"https:\/\/wcsafety.com\", \"logo\": \"https:\/\/wcsafety.com\/cdn\/shop\/files\/logo.png\"}, {\"@type\": \"Person\", \"@id\": \"https:\/\/wcsafety.com\/#editor\", \"name\": \"Steven Eaton\", \"jobTitle\": \"Editorial Lead\", \"worksFor\": {\"@id\": \"https:\/\/wcsafety.com\/#org\"}, \"knowsAbout\": [\"industrial gas detection\", \"atmospheric monitoring\", \"personal protective equipment\"]}, {\"@type\": \"Brand\", \"name\": \"Forensics Detectors\"}]}\n\u003c\/script\u003e","brand":"Forensics Detectors","offers":[{"title":"Default Title","offer_id":44266497146968,"sku":"B0C19GM4XC","price":1395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/71YQjzkBeeL._AC_SL1500.jpg?v=1782122849"},{"product_id":"macurco-pm100-co-fixed-carbon-monoxide-monitor","title":"Macurco PM100-CO Fixed Carbon Monoxide Monitor","description":"\u003c!-- PRODUCT B0GWK58K7P | tag fixed-gas-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the Macurco PM100-CO is one of the instruments we curate in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eMacurco PM100-CO — Fixed Carbon Monoxide Monitor\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMacurco PM100-CO\u003c\/strong\u003e is a compact fixed carbon-monoxide monitor for continuous, unattended CO detection — a \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"fixed gas detection system\"\u003efixed gas detection system\u003c\/a\u003e sized for the many enclosed commercial spaces where CO from engines or combustion equipment is the main hazard.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Macurco PM100-CO is a compact fixed carbon monoxide monitor for continuous, wall-mounted CO detection in commercial and plant spaces.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eCompact fixed carbon-monoxide monitor for continuous CO detection\u003c\/li\u003e\n\u003cli\u003eWall-mounted for unattended monitoring of an enclosed space\u003c\/li\u003e\n\u003cli\u003eMains-powered for always-on operation\u003c\/li\u003e\n\u003cli\u003eCompact footprint that fits where space is tight\u003c\/li\u003e\n\u003cli\u003eSingle-gas simplicity focused on the CO hazard\u003c\/li\u003e\n\u003cli\u003eFrom Macurco, a established fixed gas-detection brand\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eAffordable fixed CO monitoring\u003c\/li\u003e\n\u003cli\u003eCompact wall-mount footprint\u003c\/li\u003e\n\u003cli\u003eContinuous mains-powered operation\u003c\/li\u003e\n\u003cli\u003eSingle-gas simplicity\u003c\/li\u003e\n\u003cli\u003eEstablished Macurco brand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eCarbon monoxide only\u003c\/li\u003e\n\u003cli\u003eSingle point coverage\u003c\/li\u003e\n\u003cli\u003eHard-wired install\u003c\/li\u003e\n\u003cli\u003eThin published spec detail online\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eGas detected\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eCarbon monoxide (CO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eFixed single-gas monitor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eWall \/ fixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eMains (corded)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e5 x 2 x 4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eMacurco PM100-CO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Macurco PM100-CO fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eParking garages and loading docks\u003c\/li\u003e\n\u003cli\u003eWarehouses with propane forklifts\u003c\/li\u003e\n\u003cli\u003eBoiler and combustion-equipment rooms\u003c\/li\u003e\n\u003cli\u003eCommercial kitchens\u003c\/li\u003e\n\u003cli\u003eAny enclosed space with a CO source\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Macurco PM100-CO detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eThe PM100-CO monitors \u003cstrong\u003ecarbon monoxide (CO) only\u003c\/strong\u003e — not combustibles, oxygen or other toxics. For combustible monitoring use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX LEL Detector\"\u003eForensics EX LEL Detector\u003c\/a\u003e; for several gases at once the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount Monitor\"\u003eForensics 4 Gas Wall-Mount Monitor\u003c\/a\u003e; and where you need to coordinate multiple heads, a controller like the \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e. Mount CO heads near the breathing zone in the area of concern. A fixed monitor protects the space; for portable checks use a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Wall-Mount\"\u003eForensics Hydrogen Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount\"\u003eForensics 4 Gas Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eMacurco fixed gas-detection family\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eMacurco fixed gas-detection family\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eRole\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eGas\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eNotable\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"PM100-CO\"\u003ePM100-CO\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003ePoint monitor\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCarbon monoxide\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCompact fixed CO\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"GBC-24-2\"\u003eGBC-24-2\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eController\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMulti-channel\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e2 relay outputs\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$888\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003ePM100-CO\u003c\/strong\u003e for affordable, compact fixed CO monitoring of a single space.\u003c\/li\u003e\n\u003cli\u003eCoordinating several heads or relays? Add a \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2 controller\"\u003eMacurco GBC-24-2 controller\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eNeed combustibles or multiple gases? Use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX LEL\"\u003eForensics EX LEL\u003c\/a\u003e or \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat does the Macurco PM100-CO monitor?\u003c\/h3\u003e\u003cp\u003eCarbon monoxide (CO) only, continuously, from a fixed wall-mounted position. It does not detect combustibles, oxygen or other toxics.\u003c\/p\u003e\n\u003ch3\u003eWhere is a fixed CO monitor used?\u003c\/h3\u003e\u003cp\u003eEnclosed commercial spaces with CO sources — parking garages, warehouses with propane forklifts, boiler rooms and commercial kitchens.\u003c\/p\u003e\n\u003ch3\u003eWhere should I mount a fixed CO detector?\u003c\/h3\u003e\u003cp\u003eIn the area of concern near the breathing zone; CO is close to the density of air, so placement focuses on where people are and where the source is.\u003c\/p\u003e\n\u003ch3\u003eIs the PM100-CO mains powered?\u003c\/h3\u003e\u003cp\u003eYes — it is a hard-wired fixed monitor for continuous, always-on operation, not a battery clip.\u003c\/p\u003e\n\u003ch3\u003eHow does it compare to a personal CO monitor?\u003c\/h3\u003e\u003cp\u003eThe PM100-CO guards a fixed space continuously; a \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e clip protects an individual worker. Many sites use both.\u003c\/p\u003e\n\u003ch3\u003eCan it coordinate with other detectors?\u003c\/h3\u003e\u003cp\u003eFor multi-head systems with shared relays, pair fixed heads with a controller such as the \u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"Macurco GBC-24-2\"\u003eMacurco GBC-24-2\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eDoes it detect combustible gas?\u003c\/h3\u003e\u003cp\u003eNo — it is CO-only. For combustibles use the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX LEL Detector\"\u003eForensics EX LEL Detector\u003c\/a\u003e; for several gases the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Wall-Mount Monitor\"\u003e4 Gas Wall-Mount Monitor\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eDoes it need calibration?\u003c\/h3\u003e\u003cp\u003eLike all gas detectors, fixed CO monitors are calibrated periodically with CO calibration gas to keep readings accurate; follow the manufacturer's schedule.\u003c\/p\u003e\n\u003ch3\u003eIs one monitor enough?\u003c\/h3\u003e\u003cp\u003eOne head covers a typical enclosed area; larger or multi-zone spaces need additional heads, often coordinated by a controller.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eDoes installation require an electrician?\u003c\/h3\u003e\u003cp\u003eIt is hard-wired, so installation and any relay wiring should follow local electrical code.\u003c\/p\u003e\n\u003ch3\u003eWhy choose a fixed CO monitor over an alarm?\u003c\/h3\u003e\u003cp\u003eFixed industrial monitors offer continuous monitoring and integration options for plant spaces; for residential settings see the \u003ca href=\"\/collections\/carbon-monoxide-alarms-detectors\" title=\"Carbon Monoxide Alarms \u0026amp; Detectors\"\u003eCarbon Monoxide Alarms \u0026amp; Detectors\u003c\/a\u003e range instead.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eMacurco PM100-CO\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B0GWK58K7P?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this Macurco page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Macurco PM100-CO and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor#product\", \"name\": \"Macurco PM100-CO Fixed Carbon Monoxide Monitor\", \"description\": \"Macurco PM100-CO — compact fixed carbon monoxide monitor for continuous CO detection in plant and commercial spaces. Order this Macurco unit at WC Safety.\", \"sku\": \"B0GWK58K7P\", \"mpn\": \"PM100-CO\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Macurco\"}, \"category\": \"Fixed Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\", \"name\": \"Fixed Gas Detection Systems\", \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics EX LEL Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics Hydrogen Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics 4 Gas Wall-Mount Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco GBC-24-2 Gas Detection Controller\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\", \"priceCurrency\": \"USD\", \"price\": \"127.95\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Fixed Gas Detection Systems\", \"item\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Macurco PM100-CO Fixed Carbon Monoxide Monitor\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the Macurco PM100-CO monitor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Carbon monoxide (CO) only, continuously, from a fixed wall-mounted position. It does not detect combustibles, oxygen or other toxics.\"}}, {\"@type\": \"Question\", \"name\": \"Where is a fixed CO monitor used?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Enclosed commercial spaces with CO sources — parking garages, warehouses with propane forklifts, boiler rooms and commercial kitchens.\"}}, {\"@type\": \"Question\", \"name\": \"Where should I mount a fixed CO detector?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In the area of concern near the breathing zone; CO is close to the density of air, so placement focuses on where people are and where the source is.\"}}, {\"@type\": \"Question\", \"name\": \"Is the PM100-CO mains powered?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it is a hard-wired fixed monitor for continuous, always-on operation, not a battery clip.\"}}, {\"@type\": \"Question\", \"name\": \"How does it compare to a personal CO monitor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The PM100-CO guards a fixed space continuously; a Personal \u0026 Wearable Gas Detectors clip protects an individual worker. Many sites use both.\"}}, {\"@type\": \"Question\", \"name\": \"Can it coordinate with other detectors?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"For multi-head systems with shared relays, pair fixed heads with a controller such as the Macurco GBC-24-2.\"}}, {\"@type\": \"Question\", \"name\": \"Does it detect combustible gas?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it is CO-only. For combustibles use the Forensics EX LEL Detector; for several gases the 4 Gas Wall-Mount Monitor.\"}}, {\"@type\": \"Question\", \"name\": \"Does it need calibration?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Like all gas detectors, fixed CO monitors are calibrated periodically with CO calibration gas to keep readings accurate; follow the manufacturer's schedule.\"}}, {\"@type\": \"Question\", \"name\": \"Is one monitor enough?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One head covers a typical enclosed area; larger or multi-zone spaces need additional heads, often coordinated by a controller.\"}}, {\"@type\": \"Question\", \"name\": \"Is it in stock and how does it ship?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use the Amazon buy button for current availability and delivery timing through our fulfillment partner.\"}}, {\"@type\": \"Question\", \"name\": \"Does installation require an electrician?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is hard-wired, so installation and any relay wiring should follow local electrical code.\"}}, {\"@type\": \"Question\", \"name\": \"Why choose a fixed CO monitor over an alarm?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Fixed industrial monitors offer continuous monitoring and integration options for plant spaces; for residential settings see the Carbon Monoxide Alarms \u0026 Detectors range instead.\"}}]}, {\"@type\": \"Organization\", \"@id\": \"https:\/\/wcsafety.com\/#org\", \"name\": \"WC Safety\", \"url\": \"https:\/\/wcsafety.com\", \"logo\": \"https:\/\/wcsafety.com\/cdn\/shop\/files\/logo.png\"}, {\"@type\": \"Person\", \"@id\": \"https:\/\/wcsafety.com\/#editor\", \"name\": \"Steven Eaton\", \"jobTitle\": \"Editorial Lead\", \"worksFor\": {\"@id\": \"https:\/\/wcsafety.com\/#org\"}, \"knowsAbout\": [\"industrial gas detection\", \"atmospheric monitoring\", \"personal protective equipment\"]}, {\"@type\": \"Brand\", \"name\": \"Macurco\"}]}\n\u003c\/script\u003e","brand":"Macurco","offers":[{"title":"Default Title","offer_id":44266497278040,"sku":"B0GWK58K7P","price":127.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/41Ab6LgrD3L._AC_SL1000.jpg?v=1782122852"},{"product_id":"macurco-gbc-24-2-gas-detection-controller","title":"Macurco GBC-24-2 Gas Detection Controller (2 Relays)","description":"\u003c!-- PRODUCT B0GHSGJMNW | tag fixed-gas-detector | TODO: add matching Product Review + best-of guide links when those silo layers exist --\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;padding:14px 18px;margin:0 0 18px 0;color:#f5e6d3;font-size:0.95em;\"\u003e\n\u003cstrong style=\"color:#ffb74d;\"\u003eEditor’s note:\u003c\/strong\u003e the Macurco GBC-24-2 is one of the instruments we curate in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eMacurco GBC-24-2 Gas Detection Controller — 2 Relay Outputs\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMacurco GBC-24-2\u003c\/strong\u003e is a gas-detection controller with two relay outputs that turns connected detector heads into a coordinated \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"fixed gas detection system\"\u003efixed gas detection system\u003c\/a\u003e — driving ventilation and alarms from one panel, with staged response on its two relays.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#bdae9d;margin:10px 0 18px 0;\"\u003eJump to: \u003ca href=\"#features\" style=\"color:#ffb74d;\"\u003eFeatures\u003c\/a\u003e · \u003ca href=\"#specs\" style=\"color:#ffb74d;\"\u003eSpecs\u003c\/a\u003e · \u003ca href=\"#compatibility\" style=\"color:#ffb74d;\"\u003eWhat it detects\u003c\/a\u003e · \u003ca href=\"#comparison\" style=\"color:#ffb74d;\"\u003eComparison\u003c\/a\u003e · \u003ca href=\"#faq\" style=\"color:#ffb74d;\"\u003eFAQ\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Macurco GBC-24-2 is a fixed gas-detection controller with two relay outputs that drives ventilation and alarms from connected gas detectors in boiler and equipment rooms.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eCentral controller that drives ventilation and alarms from connected gas detectors\u003c\/li\u003e\n\u003cli\u003eTwo relay outputs for staged action — e.g. ventilation on low, shutdown\/alarm on high\u003c\/li\u003e\n\u003cli\u003eCoordinates a fixed gas-detection system from one panel\u003c\/li\u003e\n\u003cli\u003eDesigned for boiler and equipment-room gas control\u003c\/li\u003e\n\u003cli\u003ePairs with fixed detector heads for a complete system\u003c\/li\u003e\n\u003cli\u003eFrom Macurco, a established fixed gas-detection brand\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"display:flex;gap:14px;flex-wrap:wrap;margin:18px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#1b3a2a;border:1px solid #4caf50;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#81c784;\"\u003ePros\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eCentralises control of a fixed system\u003c\/li\u003e\n\u003cli\u003eTwo relay outputs for staged response\u003c\/li\u003e\n\u003cli\u003eCoordinates ventilation and alarms\u003c\/li\u003e\n\u003cli\u003ePanel\/fixed mount\u003c\/li\u003e\n\u003cli\u003eEstablished Macurco brand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:240px;background:#3a1e1e;border:1px solid #ef5350;border-radius:6px;padding:14px 18px;\"\u003e\n\u003cstrong style=\"color:#e57373;\"\u003eCons\u003c\/strong\u003e\u003cul style=\"margin:8px 0 0 0;\"\u003e\n\u003cli\u003eController only — needs detector heads\u003c\/li\u003e\n\u003cli\u003eThin published spec detail online\u003c\/li\u003e\n\u003cli\u003eHard-wired install required\u003c\/li\u003e\n\u003cli\u003eNot a standalone detector\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3 id=\"specs\"\u003eSpecifications\u003c\/h3\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eRole\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eGas detection \/ boiler controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eRelays\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e2 relay outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eDrives ventilation \u0026amp; alarms from connected detectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eFixed \/ panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e24 V class\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#ffb74d;padding:8px 10px;border:1px solid #3a3a3a;white-space:nowrap;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eMacurco GBC-24-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Macurco GBC-24-2 fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eBoiler and mechanical rooms\u003c\/li\u003e\n\u003cli\u003eParking-garage CO ventilation control\u003c\/li\u003e\n\u003cli\u003eMulti-detector plant systems\u003c\/li\u003e\n\u003cli\u003eStaged ventilation\/shutdown logic\u003c\/li\u003e\n\u003cli\u003eCoordinating several fixed heads from one panel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Macurco GBC-24-2 detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eThe GBC-24-2 is a \u003cstrong\u003econtroller, not a detector\u003c\/strong\u003e — it coordinates fixed detector heads and drives ventilation and alarms through its two relays. Pair it with fixed heads such as the \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e or the Forensics \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e and \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Wall-Mount Monitor\"\u003e4 Gas Wall-Mount Monitor\u003c\/a\u003e. Use the two relays for staged action — ventilation at a low set point, shutdown or full alarm at a high one. The system protects the space; entrants still use a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument for pre-entry testing.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"Forensics EX\/LEL Wall-Mount\"\u003eForensics EX\/LEL Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-hydrogen-gas-detector-wall-mount\" title=\"Forensics Hydrogen Wall-Mount\"\u003eForensics Hydrogen Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount\"\u003eForensics 4 Gas Wall-Mount\u003c\/a\u003e, \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e. For other gas-detection form factors see \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e, \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e, or browse the full \u003ca href=\"\/collections\/gas-detectors\" title=\"Gas Detectors\"\u003eGas Detectors\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eMacurco fixed gas-detection family\u003c\/h2\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;margin:14px 0;\"\u003e\n\u003ccaption style=\"color:#bdae9d;font-size:0.85em;text-align:left;padding:4px 0;\"\u003eMacurco fixed gas-detection family\u003c\/caption\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eRole\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eGas\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eNotable\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eStreet price\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"PM100-CO\"\u003ePM100-CO\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003ePoint monitor\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCarbon monoxide\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCompact fixed CO\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/macurco-gbc-24-2-gas-detection-controller\" title=\"GBC-24-2\"\u003eGBC-24-2\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eController\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMulti-channel\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e2 relay outputs\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$888\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003eGBC-24-2\u003c\/strong\u003e to centralise control and staged relays for a fixed gas-detection system.\u003c\/li\u003e\n\u003cli\u003eAdd detector heads — start with the \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e for CO.\u003c\/li\u003e\n\u003cli\u003eFor combustible and multi-gas heads, see the Forensics \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL\"\u003eEX LEL\u003c\/a\u003e and \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas Monitor\"\u003e4 Gas Monitor\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat does the Macurco GBC-24-2 do?\u003c\/h3\u003e\u003cp\u003eIt is a gas-detection controller — it takes signals from connected detector heads and drives ventilation and alarms through two relay outputs. It is not itself a gas sensor.\u003c\/p\u003e\n\u003ch3\u003eWhat are the two relays for?\u003c\/h3\u003e\u003cp\u003eStaged response — for example, energise ventilation at a low gas level on one relay, then trigger shutdown or a full alarm at a higher level on the other.\u003c\/p\u003e\n\u003ch3\u003eDo I need detector heads with it?\u003c\/h3\u003e\u003cp\u003eYes — the controller coordinates heads. Pair it with fixed detectors such as the \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"Macurco PM100-CO\"\u003eMacurco PM100-CO\u003c\/a\u003e or a Forensics \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL Detector\"\u003eEX LEL Detector\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhere is the GBC-24-2 used?\u003c\/h3\u003e\u003cp\u003eBoiler and mechanical rooms, parking-garage CO ventilation control, and any plant space where several fixed detectors need coordinated relays from one panel.\u003c\/p\u003e\n\u003ch3\u003eCan it control building ventilation?\u003c\/h3\u003e\u003cp\u003eYes — driving exhaust ventilation is a primary function; the relays energise fans or shutdown circuits based on the connected detectors' readings.\u003c\/p\u003e\n\u003ch3\u003eIs it a standalone gas detector?\u003c\/h3\u003e\u003cp\u003eNo — it is a controller. For a single standalone fixed detector, see the \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"Forensics 4 Gas Wall-Mount Monitor\"\u003eForensics 4 Gas Wall-Mount Monitor\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eHow is it mounted and powered?\u003c\/h3\u003e\u003cp\u003eIt is a fixed\/panel-mounted, hard-wired controller; installation and relay wiring should follow local electrical code.\u003c\/p\u003e\n\u003ch3\u003eHow many detectors can it coordinate?\u003c\/h3\u003e\u003cp\u003eIt centralises control and provides two relay outputs for staged action; size your system with the heads and zones your space requires.\u003c\/p\u003e\n\u003ch3\u003eDoes it replace portable testing?\u003c\/h3\u003e\u003cp\u003eNo — even with fixed detection and control, pre-entry testing of a space uses a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e instrument.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for current availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eDoes it need professional installation?\u003c\/h3\u003e\u003cp\u003eAs a hard-wired controller wired to detectors and ventilation\/shutdown circuits, it should be installed to local electrical code, often by a qualified contractor.\u003c\/p\u003e\n\u003ch3\u003eWhat gases does the system detect?\u003c\/h3\u003e\u003cp\u003eThat depends on the heads you connect — CO from the \u003ca href=\"\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\" title=\"PM100-CO\"\u003ePM100-CO\u003c\/a\u003e, combustibles or multi-gas from the Forensics \u003ca href=\"\/products\/forensics-ex-lel-gas-detector-wall-mount\" title=\"EX LEL\"\u003eEX LEL\u003c\/a\u003e and \u003ca href=\"\/products\/forensics-4-gas-wall-mount-monitor\" title=\"4 Gas\"\u003e4 Gas\u003c\/a\u003e heads.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border:1px solid #3a3a3a;border-radius:6px;padding:16px 18px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 10px 0;color:#f5e6d3;\"\u003eReady to order the \u003cstrong\u003eMacurco GBC-24-2\u003c\/strong\u003e? Add it to your cart above, or check the current Amazon price below. Compare it against the rest of our \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e lineup before you buy.\u003c\/p\u003e\n\u003cp style=\"display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0;\"\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B0GHSGJMNW?tag=wcsafety04-20\" rel=\"sponsored nofollow noopener\" target=\"_blank\" style=\"display:inline-block;background:#FFD814;color:#0F1111;padding:13px 26px;text-decoration:none;font-weight:bold;border-radius:4px;border:1px solid #FCD200;\"\u003eCHECK PRICE ON AMAZON →\u003c\/a\u003e\u003cspan style=\"font-size:0.8em;color:#bdae9d;\"\u003eAs an Amazon Associate, WC Safety earns from qualifying purchases.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#1a2733;border:1px dashed #4fc3f7;padding:16px 20px;margin:30px 0 18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eWhy trust this Macurco page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications here are taken from the manufacturer’s published listing for Macurco GBC-24-2 and framed against \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 29 CFR 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA Permissible Exposure Limits\u003c\/a\u003e. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or our lineup.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:18px 22px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eBy Steven Eaton, WC Safety Editorial\u003c\/strong\u003e — Industrial safety-equipment desk · specialization: atmospheric monitoring, gas detection and instrument selection.\u003cbr\u003e\n  \u003cstrong\u003eLast updated:\u003c\/strong\u003e \u003ctime datetime=\"2026-06-22\"\u003eJune 22, 2026\u003c\/time\u003e · \u003cstrong\u003eSources reviewed:\u003c\/strong\u003e manufacturer product listing \u0026amp; specifications, OSHA 29 CFR 1910.146, OSHA Annotated PEL tables, ACGIH Threshold Limit Values.\u003cbr\u003e\n  \u003cstrong\u003eEditorial standard:\u003c\/strong\u003e \u003cem\u003eZero sponsored listings. No manufacturer input. Specs verified against the manufacturer’s published data.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#1a2733;border-left:4px solid #4fc3f7;padding:16px 20px;margin:18px 0;color:#cfd8dc;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#4fc3f7;\"\u003eHow this page is maintained.\u003c\/strong\u003e Specifications and pricing are reviewed against the manufacturer’s current listing and re-checked whenever the lineup changes. Gas-detection guidance follows \u003ca href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.146\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA 1910.146\u003c\/a\u003e and \u003ca href=\"https:\/\/www.osha.gov\/annotated-pels\" rel=\"noopener\" target=\"_blank\" style=\"color:#4fc3f7;\"\u003eOSHA PELs\u003c\/a\u003e, cross-referenced with ACGIH TLVs.\n\u003c\/div\u003e\n\u003cdiv style=\"background:#2a2520;border-left:4px solid #ff9800;padding:16px 20px;margin:18px 0;color:#f5e6d3;font-size:0.92em;\"\u003e\n  \u003cstrong style=\"color:#ffb74d;\"\u003eDisclosure.\u003c\/strong\u003e WC Safety participates in the Amazon Associates Program and earns commissions on qualifying purchases through outbound links on this page (tag wcsafety04-20). We are not sponsored by any instrument manufacturer. This page is buyer guidance, not medical, legal or regulatory advice — confirm gas-detection requirements for your site against the applicable OSHA standard and, for commercial monitoring programs, a Certified Industrial Hygienist (CIH).\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"@id\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller#product\", \"name\": \"Macurco GBC-24-2 Gas Detection Controller (2 Relays)\", \"description\": \"Macurco GBC-24-2 gas detection controller with 2 relay outputs — drives ventilation and alarms from connected fixed gas detectors. Order at WC Safety.\", \"sku\": \"B0GHSGJMNW\", \"mpn\": \"GBC-24-2\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/macurco-gbc-24-2-gas-detection-controller.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Macurco\"}, \"category\": \"Fixed Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems#collection\", \"name\": \"Fixed Gas Detection Systems\", \"url\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics EX LEL Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics Hydrogen Gas Detector (Wall-Mount)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-hydrogen-gas-detector-wall-mount\"}, {\"@type\": \"Product\", \"name\": \"Forensics 4 Gas Wall-Mount Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-4-gas-wall-mount-monitor\"}, {\"@type\": \"Product\", \"name\": \"Macurco PM100-CO Fixed CO Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-pm100-co-fixed-carbon-monoxide-monitor\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller\", \"priceCurrency\": \"USD\", \"price\": \"888.10\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/macurco-gbc-24-2-gas-detection-controller#breadcrumb\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/wcsafety.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Fixed Gas Detection Systems\", \"item\": \"https:\/\/wcsafety.com\/collections\/fixed-gas-detection-systems\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Macurco GBC-24-2 Gas Detection Controller (2 Relays)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the Macurco GBC-24-2 do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is a gas-detection controller — it takes signals from connected detector heads and drives ventilation and alarms through two relay outputs. It is not itself a gas sensor.\"}}, {\"@type\": \"Question\", \"name\": \"What are the two relays for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Staged response — for example, energise ventilation at a low gas level on one relay, then trigger shutdown or a full alarm at a higher level on the other.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need detector heads with it?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — the controller coordinates heads. Pair it with fixed detectors such as the Macurco PM100-CO or a Forensics EX LEL Detector.\"}}, {\"@type\": \"Question\", \"name\": \"Where is the GBC-24-2 used?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Boiler and mechanical rooms, parking-garage CO ventilation control, and any plant space where several fixed detectors need coordinated relays from one panel.\"}}, {\"@type\": \"Question\", \"name\": \"Can it control building ventilation?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — driving exhaust ventilation is a primary function; the relays energise fans or shutdown circuits based on the connected detectors' readings.\"}}, {\"@type\": \"Question\", \"name\": \"Is it a standalone gas detector?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — it is a controller. 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