{"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","url":"https:\/\/wcsafety.com\/products\/forensics-ex-lel-gas-detector-wall-mount","provider":"WC Safety","version":"1.0","type":"link"}