{"product_id":"forsensal-4-gas-detector-with-pump","title":"Forsensal 4 Gas Detector with Pump (CO, EX\/LEL, O2, H2S, Calibration Kit)","description":"\u003c!-- PRODUCT B0D72WZYSX | tag portable-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 Forsensal 4 gas detector with pump is one of the portable instruments we curate in our \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e buyer’s hub. Compare it head-to-head with the \u003ca href=\"\/products\/forensics-detectors-4-gas-meter-confined-space\" title=\"Forensics Detectors 4 Gas Meter\"\u003eForensics Detectors 4 Gas Meter\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eForsensal 4 Gas Detector with Pump — Sample-Draw CO, EX, O2 \u0026amp; H2S\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eForsensal 4 gas detector with pump\u003c\/strong\u003e brings sample-draw testing to a budget price — a \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"portable gas detector\"\u003eportable gas detector\u003c\/a\u003e that pumps a remote sample of oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) and ships with a calibration kit and a 3000mAh battery, aimed at crews who need a pump without the premium-instrument cost.\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 Forsensal 4 Gas Detector with Pump is a rechargeable electrochemical four-gas instrument (CO, EX\/LEL, O2, H2S) with a built-in sample-draw pump and an included calibration kit, built for confined-space pre-entry testing.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eBuilt-in pump for sample-draw testing of sewers, tanks and confined spaces\u003c\/li\u003e\n\u003cli\u003eReads oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) — written CO, EX, O2 and H2S on the unit\u003c\/li\u003e\n\u003cli\u003eLarge 3000mAh rechargeable battery for extended runtime\u003c\/li\u003e\n\u003cli\u003eIncludes a calibration kit so you can verify accuracy out of the box\u003c\/li\u003e\n\u003cli\u003eAudible, visual and vibration alarms\u003c\/li\u003e\n\u003cli\u003eLCD display with belt clip for portable use\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\u003ePump-equipped at a low price point\u003c\/li\u003e\n\u003cli\u003eCalibration kit included\u003c\/li\u003e\n\u003cli\u003eLarge 3000mAh battery\u003c\/li\u003e\n\u003cli\u003eTriple alarm modes\u003c\/li\u003e\n\u003cli\u003eBelt-clip portability\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\u003eValue brand with a smaller track record\u003c\/li\u003e\n\u003cli\u003ePump and probe need cleaning\/maintenance\u003c\/li\u003e\n\u003cli\u003eElectrochemical sensors need periodic replacement\u003c\/li\u003e\n\u003cli\u003eNo NIST certificate as standard\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, EX (LEL), O2, H2S\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;\"\u003eSampling\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eBuilt-in pump (sample-draw)\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;\"\u003eSensor type\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eElectrochemical\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;\"\u003eBattery\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e3000 mAh rechargeable\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;\"\u003eIncluded\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eCalibration kit\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;\"\u003eAlarms\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eAudible, visual \u0026amp; vibration\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;\"\u003eDisplay\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eLCD with clip\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;\"\u003e11.2 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Forsensal 4 Gas Detector with Pump fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eSewer and drain gas sampling\u003c\/li\u003e\n\u003cli\u003eConfined-space pre-entry testing on a budget\u003c\/li\u003e\n\u003cli\u003eTank and vault checks\u003c\/li\u003e\n\u003cli\u003eMaintenance and utility work\u003c\/li\u003e\n\u003cli\u003eBackup pump unit for a tool crib\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Forsensal 4 Gas Detector with Pump detects (and what it doesn’t)\u003c\/h2\u003e\n\n\u003cp\u003eIt detects oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) and uses a built-in pump to draw remote samples — handy for sewers, drains and tanks. It does not read VOCs, CO2 or single toxics like chlorine or ammonia; those need a PID or dedicated sensor. The included calibration kit lets you verify accuracy; still bump-test before use. For a NIST-certified pump alternative, compare the \u003ca href=\"\/products\/forensics-detectors-4-gas-monitor-with-pump\" title=\"Forensics Detectors 4 Gas Monitor with Pump\"\u003eForensics Detectors 4 Gas Monitor with Pump\u003c\/a\u003e. For single-worker wear, add a clip from \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e hub alongside the \u003ca href=\"\/products\/forensics-detectors-4-gas-meter-confined-space\" title=\"Forensics Detectors 4 Gas Meter\"\u003eForensics Detectors 4 Gas Meter\u003c\/a\u003e, \u003ca href=\"\/products\/forensics-detectors-4-gas-monitor-usb-rechargeable\" title=\"Forensics Detectors USB 4 Gas Monitor\"\u003eForensics Detectors USB 4 Gas Monitor\u003c\/a\u003e, \u003ca href=\"\/products\/toptes-guard-863pro-4-gas-monitor\" title=\"TopTes Guard-863Pro\"\u003eTopTes Guard-863Pro\u003c\/a\u003e, \u003ca href=\"\/products\/toptes-guard-101-4-gas-detector\" title=\"TopTes Guard-101\"\u003eTopTes Guard-101\u003c\/a\u003e. If one worker needs all-shift wear instead of a carried meter, see \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e; for a fixed install or a job-site perimeter, see \u003ca href=\"\/collections\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\u003c\/a\u003e and \u003ca href=\"\/collections\/area-gas-monitors\" title=\"Area \u0026amp; Transportable Gas Monitors\"\u003eArea \u0026amp; Transportable Gas Monitors\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2 id=\"comparison\"\u003eHow the Forsensal pump detector compares\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;\"\u003ePortable pump (sample-draw) options we stock\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;\"\u003eSampling\u003c\/th\u003e\n\u003cth style=\"color:#ffb74d;padding:9px;border:1px solid #3a3a3a;text-align:left;\"\u003eExtras\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 style=\"background:#2a2520;\"\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e\u003cstrong\u003e\u003ca href=\"\/products\/forsensal-4-gas-detector-with-pump\" title=\"Forsensal 4 Gas + Pump\"\u003eForsensal 4 Gas + Pump\u003c\/a\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eBuilt-in pump\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eCalibration kit, 3000mAh\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$140\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-detectors-4-gas-monitor-with-pump\" title=\"Forensics 4 Gas + Pump\"\u003eForensics 4 Gas + Pump\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eMotorized pump + probe\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003eNIST certificate, USB\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:9px;border:1px solid #3a3a3a;\"\u003e~$299\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\u003eForsensal 4 Gas + Pump\u003c\/strong\u003e for the lowest-cost way to get sample-draw plus an included calibration kit.\u003c\/li\u003e\n\u003cli\u003eStep up to the \u003ca href=\"\/products\/forensics-detectors-4-gas-monitor-with-pump\" title=\"Forensics Detectors 4 Gas Monitor with Pump\"\u003eForensics Detectors 4 Gas Monitor with Pump\u003c\/a\u003e if you need a NIST certificate and probe for formal permit programs.\u003c\/li\u003e\n\u003cli\u003eIf you do not need a pump at all, the diffusion \u003ca href=\"\/products\/toptes-guard-101-4-gas-detector\" title=\"TopTes Guard-101\"\u003eTopTes Guard-101\u003c\/a\u003e costs less.\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 Forsensal 4 gas detector with pump detect?\u003c\/h3\u003e\u003cp\u003eIt reads oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) (labelled CO, EX, O2 and H2S on the unit). For VOCs you need a separate PID; see the \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e hub.\u003c\/p\u003e\n\u003ch3\u003eDoes the Forsensal come with a calibration kit?\u003c\/h3\u003e\u003cp\u003eYes — it includes a calibration kit so you can verify accuracy out of the box. You should still bump-test before each use with four-gas calibration gas.\u003c\/p\u003e\n\u003ch3\u003eWhat is the pump for?\u003c\/h3\u003e\u003cp\u003eThe built-in pump draws a remote sample so you can test a sewer, drain, tank or confined space before anyone enters, rather than relying on diffusion of the air around the unit.\u003c\/p\u003e\n\u003ch3\u003eHow big is the battery?\u003c\/h3\u003e\u003cp\u003eIt uses a 3000mAh rechargeable battery for extended runtime across long shifts and pump operation.\u003c\/p\u003e\n\u003ch3\u003eHow does it compare to the Forensics pump monitor?\u003c\/h3\u003e\u003cp\u003eThe Forsensal is lower cost and includes a calibration kit; the \u003ca href=\"\/products\/forensics-detectors-4-gas-monitor-with-pump\" title=\"Forensics 4 Gas Monitor with Pump\"\u003eForensics 4 Gas Monitor with Pump\u003c\/a\u003e adds a NIST certificate and probe, which formal permit programs often require.\u003c\/p\u003e\n\u003ch3\u003eCan I use it for confined-space entry?\u003c\/h3\u003e\u003cp\u003eYes — its sample-draw pump and O2\/CO\/H2S\/LEL set suit pre-entry testing. Follow the standard sequence: oxygen first, then combustibles, then toxics.\u003c\/p\u003e\n\u003ch3\u003eIs it NIST calibrated?\u003c\/h3\u003e\u003cp\u003eIt includes a calibration kit but is not sold with a NIST certificate as standard. If you need documented NIST calibration, choose the \u003ca href=\"\/products\/forensics-detectors-4-gas-monitor-with-pump\" title=\"Forensics pump monitor\"\u003eForensics pump monitor\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eDoes the pump need maintenance?\u003c\/h3\u003e\u003cp\u003eYes — keep the pump path and probe clean and free of moisture and debris so samples draw correctly, and check flow per the instructions.\u003c\/p\u003e\n\u003ch3\u003eWhat alarms does it have?\u003c\/h3\u003e\u003cp\u003eAudible, visual and vibration alarms trigger when any monitored gas exceeds its set point.\u003c\/p\u003e\n\u003ch3\u003eWhat does it not detect?\u003c\/h3\u003e\u003cp\u003eNo VOCs, CO2 or gas-specific toxics like ammonia or chlorine. For VOC work, use a PID — see the \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\u003c\/a\u003e hub.\u003c\/p\u003e\n\u003ch3\u003eIs it in stock and how does it ship?\u003c\/h3\u003e\u003cp\u003eUse the Amazon buy button for live availability and delivery timing through our fulfillment partner.\u003c\/p\u003e\n\u003ch3\u003eDo I still need a personal monitor?\u003c\/h3\u003e\u003cp\u003eFor per-worker exposure, yes — pair it with a wearable clip from \u003ca href=\"\/collections\/personal-gas-detectors\" title=\"Personal \u0026amp; Wearable Gas Detectors\"\u003ePersonal \u0026amp; Wearable Gas Detectors\u003c\/a\u003e; the pump unit handles pre-entry and shared testing.\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\u003eForsensal 4 gas detector with pump\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\/portable-gas-detectors\" title=\"Portable Gas Detectors\"\u003ePortable Gas Detectors\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\/B0D72WZYSX?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 Forsensal page?\u003c\/strong\u003e WC Safety is an independent industrial safety-equipment retailer serving safety managers, procurement teams and field supervisors. The specifications on this page are taken from the manufacturer’s published listing for Forsensal 4 Gas Detector with Pump 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 for confined-space atmospheric testing. Disclosed: WC Safety earns Amazon affiliate commissions on outbound clicks; that does not influence the specs shown or where this unit sits in 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: portable atmospheric monitoring, confined-space 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 (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, 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\/forsensal-4-gas-detector-with-pump#product\", \"name\": \"Forsensal 4 Gas Detector with Pump (CO, EX\/LEL, O2, H2S, Calibration Kit)\", \"description\": \"Forsensal 4 gas detector with pump — CO, EX\/LEL, O2 \u0026 H2S with sample-draw, 3000mAh battery and calibration kit. Confined-space monitor at WC Safety.\", \"sku\": \"B0D72WZYSX\", \"mpn\": \"Forsensal-4GP\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/forsensal-4-gas-detector-with-pump.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Forsensal\"}, \"category\": \"Portable Gas Detector\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/portable-gas-detectors#collection\", \"name\": \"Portable Gas Detectors\", \"url\": \"https:\/\/wcsafety.com\/collections\/portable-gas-detectors\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Forensics Detectors 4 Gas Meter for Confined Space\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-detectors-4-gas-meter-confined-space\"}, {\"@type\": \"Product\", \"name\": \"Forensics Detectors 4 Gas Monitor (USB Rechargeable)\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-detectors-4-gas-monitor-usb-rechargeable\"}, {\"@type\": \"Product\", \"name\": \"TopTes Guard-863Pro 4 Gas Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-guard-863pro-4-gas-monitor\"}, {\"@type\": \"Product\", \"name\": \"TopTes Guard-101 4 Gas Detector\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-guard-101-4-gas-detector\"}, {\"@type\": \"Product\", \"name\": \"TopTes Guard-156 4 Gas Monitor\", \"url\": \"https:\/\/wcsafety.com\/products\/toptes-guard-156-4-gas-monitor\"}, {\"@type\": \"Product\", \"name\": \"Forensics Detectors 4 Gas Monitor with Pump\", \"url\": \"https:\/\/wcsafety.com\/products\/forensics-detectors-4-gas-monitor-with-pump\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/forsensal-4-gas-detector-with-pump\", \"priceCurrency\": \"USD\", \"price\": \"139.99\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/forsensal-4-gas-detector-with-pump#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\": \"Portable Gas Detectors\", \"item\": \"https:\/\/wcsafety.com\/collections\/portable-gas-detectors\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Forsensal 4 Gas Detector with Pump (CO, EX\/LEL, O2, H2S, Calibration Kit)\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What gases does the Forsensal 4 gas detector with pump detect?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It reads oxygen (O2), combustible gas (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S) (labelled CO, EX, O2 and H2S on the unit). For VOCs you need a separate PID; see the Portable Gas Detectors hub.\"}}, {\"@type\": \"Question\", \"name\": \"Does the Forsensal come with a calibration kit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — it includes a calibration kit so you can verify accuracy out of the box. You should still bump-test before each use with four-gas calibration gas.\"}}, {\"@type\": \"Question\", \"name\": \"What is the pump for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The built-in pump draws a remote sample so you can test a sewer, drain, tank or confined space before anyone enters, rather than relying on diffusion of the air around the unit.\"}}, {\"@type\": \"Question\", \"name\": \"How big is the battery?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It uses a 3000mAh rechargeable battery for extended runtime across long shifts and pump operation.\"}}, {\"@type\": \"Question\", \"name\": \"How does it compare to the Forensics pump monitor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Forsensal is lower cost and includes a calibration kit; the Forensics 4 Gas Monitor with Pump adds a NIST certificate and probe, which formal permit programs often require.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use it for confined-space entry?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — its sample-draw pump and O2\/CO\/H2S\/LEL set suit pre-entry testing. 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If you need documented NIST calibration, choose the Forensics pump monitor.\"}}, {\"@type\": \"Question\", \"name\": \"Does the pump need maintenance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — keep the pump path and probe clean and free of moisture and debris so samples draw correctly, and check flow per the instructions.\"}}, {\"@type\": \"Question\", \"name\": \"What alarms does it have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Audible, visual and vibration alarms trigger when any monitored gas exceeds its set point.\"}}, {\"@type\": \"Question\", \"name\": \"What does it not detect?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No VOCs, CO2 or gas-specific toxics like ammonia or chlorine. 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