{"product_id":"norlab-4-gas-calibration-gas-mix","title":"Norlab 4-Gas Calibration Gas Mix (H2S, CO, Methane LEL, O2) — 29 Liter","description":"\u003c!-- PRODUCT B011T9OKRE | tag gas-detection-accessory | 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 Norlab 4-gas calibration gas is one of the instruments we curate in our \u003ca href=\"\/collections\/gas-detector-calibration-accessories\" title=\"Gas Detector Calibration \u0026amp; Accessories\"\u003eGas Detector Calibration \u0026amp; Accessories\u003c\/a\u003e buyer’s hub. Compare it with the \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"Fixed-Flow Cal Gas Regulator\"\u003eFixed-Flow Cal Gas Regulator\u003c\/a\u003e below before you order.\u003c\/div\u003e\n\n\u003ch2 id=\"top\"\u003eNorlab 4-Gas Calibration Gas Mix — Bump-Test \u0026amp; Calibrate Your Monitor\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eNorlab 4-gas calibration gas\u003c\/strong\u003e mix is the consumable behind every reliable \u003ca href=\"\/collections\/portable-gas-detectors\" title=\"portable gas detector\"\u003eportable gas detector\u003c\/a\u003e — 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% O2 in a 29-liter cylinder for bump-testing and calibrating any standard 4-gas monitor.\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\u003eNorlab 4-Gas Calibration Gas is a 29-liter cylinder of 25 ppm H2S, 100 ppm CO, 50% LEL methane and 18% oxygen for bump-testing and calibrating standard four-gas monitors.\u003c\/p\u003e\n\n\u003ch3 id=\"features\"\u003eKey features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eFour-gas mix for bump-testing and calibrating O2\/LEL\/CO\/H2S monitors\u003c\/li\u003e\n\u003cli\u003eStandard concentrations: 25 ppm H2S, 100 ppm CO, 50% LEL methane, 18% O2, balance nitrogen\u003c\/li\u003e\n\u003cli\u003e29-liter cylinder for many bump tests per bottle\u003c\/li\u003e\n\u003cli\u003eWorks with any standard 4-gas monitor and a compatible regulator\u003c\/li\u003e\n\u003cli\u003eThe consumable every gas-detection program needs\u003c\/li\u003e\n\u003cli\u003eFrom Norlab by Norco, a recognized calibration-gas supplier\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\u003eStandard 4-gas mix for any O2\/LEL\/CO\/H2S monitor\u003c\/li\u003e\n\u003cli\u003e29 L = many bump tests\u003c\/li\u003e\n\u003cli\u003eRecognized supplier (Norlab\/Norco)\u003c\/li\u003e\n\u003cli\u003eEssential for daily bump testing\u003c\/li\u003e\n\u003cli\u003eDocumented concentrations\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\u003eRequires a compatible regulator (sold separately)\u003c\/li\u003e\n\u003cli\u003eDisposable cylinder (consumable)\u003c\/li\u003e\n\u003cli\u003eHas a shelf-life\/expiry\u003c\/li\u003e\n\u003cli\u003eShips ground-only (compressed gas)\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;\"\u003eContents\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e25 ppm H2S, 100 ppm CO, 2.5% (50% LEL) methane, 18% O2, balance nitrogen\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;\"\u003eCylinder size\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003e29 liter\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;\"\u003eUse\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eBump testing \u0026amp; calibration\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;\"\u003eCompatible\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eStandard 4-gas (O2\/LEL\/CO\/H2S) monitors\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;\"\u003eForm\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eDisposable cylinder\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;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"color:#e0e0e0;padding:8px 10px;border:1px solid #3a3a3a;\"\u003eNorlab by Norco\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eWhere the Norlab 4-Gas Calibration Gas Mix fits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eDaily bump testing before use\u003c\/li\u003e\n\u003cli\u003ePeriodic full calibration\u003c\/li\u003e\n\u003cli\u003eConfined-space program compliance\u003c\/li\u003e\n\u003cli\u003eVerifying alarm response\u003c\/li\u003e\n\u003cli\u003eFleet calibration of 4-gas monitors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat the Norlab 4-Gas Calibration Gas works with\u003c\/h2\u003e\n\n\u003cp\u003eThis mix works with \u003cstrong\u003eany standard 4-gas (O2\/LEL\/CO\/H2S) monitor\u003c\/strong\u003e — the \u003ca href=\"\/products\/\/products\/forensics-detectors-4-gas-meter-confined-space\" title=\"Forensics 4 Gas Meter\"\u003eForensics 4 Gas Meter\u003c\/a\u003e, \u003ca href=\"\/products\/\/products\/toptes-guard-101-4-gas-detector\" title=\"TopTes Guard-101\"\u003eTopTes Guard-101\u003c\/a\u003e, BW and others. It requires a compatible \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"calibration gas regulator\"\u003ecalibration gas regulator\u003c\/a\u003e (sold separately) to control flow. It does not fit single-gas-only programs needing a different gas; for those, order the matching single-gas calibration gas. Check the cylinder expiry before use.\u003c\/p\u003e\n\n\u003cp\u003eCross-shopping? This unit sits in our \u003ca href=\"\/collections\/gas-detector-calibration-accessories\" title=\"Gas Detector Calibration \u0026amp; Accessories\"\u003eGas Detector Calibration \u0026amp; Accessories\u003c\/a\u003e hub alongside \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"Fixed-Flow Cal Gas Regulator\"\u003eFixed-Flow Cal Gas Regulator\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\/fixed-gas-detection-systems\" title=\"Fixed Gas Detection Systems\"\u003eFixed Gas Detection Systems\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\"\u003eBuilding a bump-test kit\u003c\/h2\u003e\n\n\u003cp\u003eA complete bump-test kit pairs this 4-gas mix with a flow regulator. Add the \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"fixed-flow calibration gas regulator\"\u003efixed-flow calibration gas regulator\u003c\/a\u003e (0.25 LPM) to control the gas flow to your monitor during bump tests and calibration.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eOrder this \u003cstrong\u003e4-gas mix\u003c\/strong\u003e as the core consumable for any O2\/LEL\/CO\/H2S monitor program.\u003c\/li\u003e\n\u003cli\u003ePair it with the \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"fixed-flow regulator\"\u003efixed-flow regulator\u003c\/a\u003e to complete a bump-test kit.\u003c\/li\u003e\n\u003cli\u003eApply it to monitors across the \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 hubs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 id=\"faq\"\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is in the Norlab 4-gas calibration mix?\u003c\/h3\u003e\u003cp\u003e25 ppm hydrogen sulfide (H2S), 100 ppm carbon monoxide (CO), 2.5% methane (50% LEL), 18% oxygen (O2) and balance nitrogen — the standard bump-test mix for 4-gas monitors.\u003c\/p\u003e\n\u003ch3\u003eWhat monitors does it work with?\u003c\/h3\u003e\u003cp\u003eAny standard 4-gas (O2\/LEL\/CO\/H2S) monitor, including the \u003ca href=\"\/products\/\/products\/forensics-detectors-4-gas-meter-confined-space\" title=\"Forensics 4 Gas Meter\"\u003eForensics 4 Gas Meter\u003c\/a\u003e, \u003ca href=\"\/products\/\/products\/toptes-guard-101-4-gas-detector\" title=\"TopTes Guard-101\"\u003eTopTes Guard-101\u003c\/a\u003e, BW and others.\u003c\/p\u003e\n\u003ch3\u003eDo I need a regulator too?\u003c\/h3\u003e\u003cp\u003eYes — calibration gas needs a compatible \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"flow regulator\"\u003eflow regulator\u003c\/a\u003e (sold separately) to control flow to the monitor during a bump test or calibration.\u003c\/p\u003e\n\u003ch3\u003eWhat is a bump test?\u003c\/h3\u003e\u003cp\u003eA bump test exposes the monitor to a known gas to confirm the sensors and alarms respond. It should be done before each day of use; full calibration adjusts the readings to the gas concentration.\u003c\/p\u003e\n\u003ch3\u003eHow many bump tests per cylinder?\u003c\/h3\u003e\u003cp\u003eA 29-liter cylinder provides many bump tests; the exact count depends on flow rate and test duration. Larger fleets may prefer larger cylinders.\u003c\/p\u003e\n\u003ch3\u003eDoes calibration gas expire?\u003c\/h3\u003e\u003cp\u003eYes — calibration gas has a shelf life printed on the cylinder. Use it before the expiry date for accurate results.\u003c\/p\u003e\n\u003ch3\u003eHow is calibration gas shipped?\u003c\/h3\u003e\u003cp\u003eAs a compressed-gas product it typically ships ground-only; use the Amazon buy button for current availability and shipping details.\u003c\/p\u003e\n\u003ch3\u003eCan I use it for single-gas monitors?\u003c\/h3\u003e\u003cp\u003eThis is a four-gas mix. Single-gas-only programs needing a specific gas should order the matching single-gas calibration gas.\u003c\/p\u003e\n\u003ch3\u003eHow often should I calibrate?\u003c\/h3\u003e\u003cp\u003eBump-test before each day of use and perform a full calibration on the manufacturer's schedule or after any failed bump test.\u003c\/p\u003e\n\u003ch3\u003eIs Norlab a reputable supplier?\u003c\/h3\u003e\u003cp\u003eYes — Norlab by Norco is a recognized calibration-gas supplier, and this is a standard documented 4-gas mix.\u003c\/p\u003e\n\u003ch3\u003eDoes it work with pumped and diffusion monitors?\u003c\/h3\u003e\u003cp\u003eYes, with the right regulator — a fixed-flow regulator suits diffusion monitors; pumped monitors use a demand-flow regulator. See the \u003ca href=\"\/products\/fixed-flow-calibration-gas-regulator\" title=\"regulator\"\u003eregulator\u003c\/a\u003e listing for compatibility.\u003c\/p\u003e\n\u003ch3\u003eWhat gases does it verify?\u003c\/h3\u003e\u003cp\u003eIt verifies the four standard channels — oxygen, combustible LEL (methane), carbon monoxide and hydrogen sulfide — on a 4-gas monitor.\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\u003eNorlab 4-gas calibration gas\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\/gas-detector-calibration-accessories\" title=\"Gas Detector Calibration \u0026amp; Accessories\"\u003eGas Detector Calibration \u0026amp; Accessories\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\/B011T9OKRE?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 Norlab 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 Norlab 4-Gas Calibration Gas Mix 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\/norlab-4-gas-calibration-gas-mix#product\", \"name\": \"Norlab 4-Gas Calibration Gas Mix (H2S, CO, Methane LEL, O2) — 29 Liter\", \"description\": \"Norlab 4-gas calibration gas mix — 25 ppm H2S, 100 ppm CO, 50% LEL methane, 18% O2, balance nitrogen, 29 L. Bump-test and calibrate any 4-gas monitor.\", \"sku\": \"B011T9OKRE\", \"mpn\": \"Norlab-4Gas-29L\", \"image\": [\"https:\/\/wcsafety.com\/cdn\/shop\/products\/norlab-4-gas-calibration-gas-mix.jpg\"], \"brand\": {\"@type\": \"Brand\", \"name\": \"Norlab\"}, \"category\": \"Gas Detection Accessory\", \"isPartOf\": {\"@type\": \"CollectionPage\", \"@id\": \"https:\/\/wcsafety.com\/collections\/gas-detector-calibration-accessories#collection\", \"name\": \"Gas Detector Calibration \u0026 Accessories\", \"url\": \"https:\/\/wcsafety.com\/collections\/gas-detector-calibration-accessories\"}, \"isRelatedTo\": [{\"@type\": \"Product\", \"name\": \"Fixed-Flow Calibration Gas Regulator\", \"url\": \"https:\/\/wcsafety.com\/products\/fixed-flow-calibration-gas-regulator\"}], \"offers\": {\"@type\": \"Offer\", \"url\": \"https:\/\/wcsafety.com\/products\/norlab-4-gas-calibration-gas-mix\", \"priceCurrency\": \"USD\", \"price\": \"165.00\", \"availability\": \"https:\/\/schema.org\/InStock\", \"seller\": {\"@type\": \"Organization\", \"name\": \"WC Safety\"}}}, {\"@type\": \"BreadcrumbList\", \"@id\": \"https:\/\/wcsafety.com\/products\/norlab-4-gas-calibration-gas-mix#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\": \"Gas Detector Calibration \u0026 Accessories\", \"item\": \"https:\/\/wcsafety.com\/collections\/gas-detector-calibration-accessories\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Norlab 4-Gas Calibration Gas Mix (H2S, CO, Methane LEL, O2) — 29 Liter\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is in the Norlab 4-gas calibration mix?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"25 ppm hydrogen sulfide (H2S), 100 ppm carbon monoxide (CO), 2.5% methane (50% LEL), 18% oxygen (O2) and balance nitrogen — the standard bump-test mix for 4-gas monitors.\"}}, {\"@type\": \"Question\", \"name\": \"What monitors does it work with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Any standard 4-gas (O2\/LEL\/CO\/H2S) monitor, including the Forensics 4 Gas Meter, TopTes Guard-101, BW and others.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need a regulator too?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — calibration gas needs a compatible flow regulator (sold separately) to control flow to the monitor during a bump test or calibration.\"}}, {\"@type\": \"Question\", \"name\": \"What is a bump test?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A bump test exposes the monitor to a known gas to confirm the sensors and alarms respond. It should be done before each day of use; full calibration adjusts the readings to the gas concentration.\"}}, {\"@type\": \"Question\", \"name\": \"How many bump tests per cylinder?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 29-liter cylinder provides many bump tests; the exact count depends on flow rate and test duration. Larger fleets may prefer larger cylinders.\"}}, {\"@type\": \"Question\", \"name\": \"Does calibration gas expire?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — calibration gas has a shelf life printed on the cylinder. Use it before the expiry date for accurate results.\"}}, {\"@type\": \"Question\", \"name\": \"How is calibration gas shipped?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"As a compressed-gas product it typically ships ground-only; use the Amazon buy button for current availability and shipping details.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use it for single-gas monitors?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This is a four-gas mix. Single-gas-only programs needing a specific gas should order the matching single-gas calibration gas.\"}}, {\"@type\": \"Question\", \"name\": \"How often should I calibrate?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Bump-test before each day of use and perform a full calibration on the manufacturer's schedule or after any failed bump test.\"}}, {\"@type\": \"Question\", \"name\": \"Is Norlab a reputable supplier?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — Norlab by Norco is a recognized calibration-gas supplier, and this is a standard documented 4-gas mix.\"}}, {\"@type\": \"Question\", \"name\": \"Does it work with pumped and diffusion monitors?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, with the right regulator — a fixed-flow regulator suits diffusion monitors; pumped monitors use a demand-flow regulator. See the regulator listing for compatibility.\"}}, {\"@type\": \"Question\", \"name\": \"What gases does it verify?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It verifies the four standard channels — oxygen, combustible LEL (methane), carbon monoxide and hydrogen sulfide — on a 4-gas monitor.\"}}]}, {\"@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\": \"Norlab\"}]}\n\u003c\/script\u003e","brand":"Norlab","offers":[{"title":"Default Title","offer_id":44267025465432,"sku":"B011T9OKRE","price":165.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/616Yhq5d_VL._SL1000.jpg?v=1782134767","url":"https:\/\/wcsafety.com\/products\/norlab-4-gas-calibration-gas-mix","provider":"WC Safety","version":"1.0","type":"link"}