Safety guides · 40 guides on gas detection
Gas detection guides
Plain words first, the standard cited under it, and the products that carry the rating with live prices. 40 guides, each with the question people type as its heading. Bayshore Safety, industrial safety and PPE supplier since 2017.
Ammonia exposure limits and detectionOSHA’s legal limit for ammonia is 50 ppm averaged over 8 hours.29 CFR 1910.1000 Table Z-1 (current e-CFR); NIOSH Pocket Guide to Chemical Hazards, ammoniBump test vs calibration: what each does and how oftenA bump test proves the monitor still works: you hit the sensors with a known gas and watch for the alarms.OSHA Safety and Health Information Bulletin, Calibrating and Testing Direct-Reading PortabChlorine exposure limits and detectionChlorine is regulated by ceilings, not averages, because it hurts fast.29 CFR 1910.1000 Table Z-1 (current e-CFR); NIOSH Pocket Guide to Chemical Hazards, chloriCombustible gas: what is LEL and UEL by gas (methane, propane, hydrogen)Every flammable gas burns only inside a band of concentrations in air.NIOSH Pocket Guide to Chemical Hazards (current online edition); NIOSH IC 9486 Handbook foDetector tubes vs electronic monitors: when each is usedA detector tube is a sealed glass tube of reagent that changes color when a known volume of air is pulled through it with a hand pump; the length of the stain is read against a scale printed on the tube.Manufacturer published data (Draeger, Gastec, Honeywell RAE Systems); 29 CFR 1910.146 (curDo Draeger tubes expire? Shelf life, the date on the box and how to store themYes.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.13, Draeger MicroTubes vs short-term tubes: the ppb system and when the handbook describes eachA Draeger short-term tube is read by eye: a fixed number of pump strokes, a stain, a printed scale, a result in ppm or vol.-% within a stated standard deviation.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), chapter 3 (pp.Draeger tubes and confined space entry: what the OSHA standard asks for and where a tube fitsOSHA’s permit-required confined space standard requires the atmosphere to be tested before entry with a calibrated direct-reading instrument, in the order oxygen, then flammable gases and vapors, then toxic air contamina29 CFR 1910.146(b), (c)(5)(ii)(C), (d)(5) and Appendix B (current e-CFR); Dräger-Tubes &amDraeger tubes by gas and range: all 183 tubes for 98 gases on one pageDraeger names a tube by the substance it is calibrated to and the bottom of its measuring range, so finding the tube for a job is two steps: the gas, then the range the reading has to fall in.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), sections 2.3 aDraeger tubes in heat, cold, humidity and at altitude: what the handbook says to correctDraeger tubes are calibrated at about 20 °C, 1,013 hPa and normal humidity.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.6, UDraeger X-act 5000 and X-act 7000: two different instruments, and what each one readsThey are not two sizes of the same thing.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.3 (pGas detection for confined space entry: what to test and the orderBefore anyone enters a permit space, the air inside is tested from outside with a calibrated direct-reading instrument, and OSHA fixes the order: oxygen first, then combustible gases and vapors, then toxic gases and vapo29 CFR 1910.146(b), (c)(5)(ii)(C), (d)(5) and Appendix B; 29 CFR 1926.1204(e) (current e-CGas detection records: what to log, who signs it, and how long to keep itFour records, from four places in the rules.29 CFR 1910.146 and 1910.1020 (current e-CFR); OSHA Safety and Health Information BulletinGas detector docking stations: what they do, what OSHA says about bump tests and calibration, and when a dock pays offA docking station is a cradle that a gas detector sits in at the end of the shift.OSHA Safety and Health Information Bulletin 11-26-2024, Calibrating and Testing Direct-ReaGas detector for landfills and wastewater: methane, H2S and oxygen, and which monitors fit the workLandfills and wastewater plants share the same three gas problems: methane that can burn, hydrogen sulfide that can kill in one breath, and air with too little oxygen.29 CFR 1910.146 (current e-CFR); 29 CFR 1910.1000 Table Z-2 (hydrogen sulfide); NIOSH PockGas detector sensor life: when to replace sensorsA gas sensor is a consumable.Manufacturer published data (Honeywell BW, MSA, RKI Instruments, Industrial Scientific); 2Gas monitors for welding and hot work: what to measureHot work has two gas problems, and a monitor has to cover both.29 CFR 1910.252 and 29 CFR 1910.146 (current e-CFR); 29 CFR 1910.1000 Table Z-1; OSHA FactH2S exposure limits and ppm chart: OSHA, NIOSH and ACGIHHydrogen sulfide has four sets of numbers, and they differ a lot.29 CFR 1910.1000 Table Z-2 and 1926.55 (current e-CFR); NIOSH Pocket Guide to Chemical HazHow many pump strokes does a Draeger tube take, and how long does a reading take?The number of strokes is set per tube and per scale and is printed on the tube next to that scale; it ranges from 1 stroke (Ammonia 5/a, high range) to 100 strokes (Formaldehyde 0.2/a with the activation tube).Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.3 (pHow to read a Draeger tube: the stain, the scale and the three cases the handbook describesThe concentration is the length of the discoloration read against the scale printed on the tube, after the full number of strokes for that scale.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.5, EHow to read a gas monitor alarm: low, high, TWA and STELA personal gas monitor has two kinds of alarm.29 CFR 1910.1000 Tables Z-1 and Z-2 and 1910.146(b) (current e-CFR); NIOSH Pocket Guide; mIntrinsically safe gas detectors: what Class I Div 1 and Div 2 meanAn intrinsically safe gas detector is one whose circuits cannot store or release enough electrical or thermal energy to ignite a flammable gas mixture, even when the detector fails.29 CFR 1910.307 and 1910.399 (current e-CFR); NFPA 70, National Electrical Code, Article 5Is H2S heavier than air, and where does it collect?Yes.NIOSH Pocket Guide to Chemical Hazards, hydrogen sulfide (current online edition); OSHA SaNitrogen dioxide and diesel exhaust: the exposure limits, what is in the exhaust, and the NO2 monitors we carryNitrogen dioxide is the reddish-brown, sharp-smelling gas in diesel and other engine exhaust, and OSHA treats it as a ceiling: 5 parts per million, never to be exceeded, in general industry and construction.29 CFR 1910.1000 Table Z-1 and 1926.55 (current e-CFR); NIOSH Pocket Guide to Chemical HazSingle-gas vs multi-gas detectors: which does the job need?A single-gas detector watches one gas, usually H2S, CO or oxygen, and is the right tool when the hazard is known and there is only one: a worker around sour gas, a mechanic in a garage, a lab with a nitrogen line.29 CFR 1910.146(b), (c)(5)(ii)(C) and (d)(5) (current e-CFR); manufacturer published produSulfur dioxide exposure limits and detection: the OSHA, NIOSH and ACGIH numbers and the SO2 monitors we carryOSHA’s legal limit for sulfur dioxide is 5 parts per million averaged over 8 hours, in general industry and construction alike.29 CFR 1910.1000 Table Z-1 and 1926.55 (current e-CFR); NIOSH Pocket Guide to Chemical HazThe Draeger accuro pump: how it works, the leak check, strokes and the kitsThe Draeger accuro is a manually operated bellows pump for short-term Draeger tubes: single-handed, 100 mL (± 5 %) per stroke, 1 to 50 strokes and higher, approx.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 2.3, TVOC detection with a PID: what a photoionization detector measuresA photoionization detector shines ultraviolet light on the air sample.NIOSH Pocket Guide to Chemical Hazards (ionization potentials and limits, current online eWhat do Draeger tube names mean? 0.2/a, 5/b, 100/a-P, 20/a-D and the part numberA Draeger tube name is the substance plus a type designation of numbers and letters.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 6.1.1 What do Draeger tubes measure? The gases, the ranges and what the number on the tube meansA Draeger tube measures the momentary concentration of one gas or vapor in air.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), sections 2.4, What does a 4-gas monitor measure, and why those four?A 4-gas monitor measures oxygen (as a percentage of air), combustible gas (as a percentage of the lower explosive limit), hydrogen sulfide (ppm) and carbon monoxide (ppm).29 CFR 1910.146 and 1910.1000 Tables Z-1 and Z-2 (current e-CFR); NIOSH Pocket Guide (H2S,What is a detector tube, and how does a Draeger tube work?A detector tube is a sealed glass tube packed with a chemical that changes color when a specific gas passes through it.Draeger, Gastec and RAE Systems published tube and pump data; 29 CFR 1910.146(c)(5)(ii)(C)What is calibration gas, and how to choose the right cylinderCalibration gas is a cylinder of air with a known amount of a test gas in it, made for one job: proving that a gas monitor reads correctly.29 CFR 1910.146 (current e-CFR); manufacturer published data for the cylinders and regulatWhat is cross-sensitivity on a Draeger tube, and how is it listed?A Draeger tube is calibrated to one substance.Dräger-Tubes & MicroTubes Handbook, 22nd edition (order no. 90 92 086), section 6.1.1 What is H2S (hydrogen sulfide), and why does it kill?H2S is hydrogen sulfide, a colorless gas that smells like rotten eggs at tiny concentrations and then stops smelling like anything at the concentrations that kill.29 CFR 1910.1000 Table Z-2; NIOSH Pocket GuideWhat is LEL, and what does 10 percent LEL mean on a gas monitor?LEL is the lower explosive limit: the smallest concentration of a flammable gas in air that will burn or explode if it finds a spark.29 CFR 1910.146(b); NIOSH Pocket Guide; NFPA 325 / NFPA 497What is oxygen deficiency and enrichment? The 19.5 and 23.5 percent limitsNormal air is 20.9 percent oxygen.29 CFR 1910.146(b) and 1910.134(b), (d)(2)(iii) and Table II (current e-CFR); OSHA letter What is the carbon monoxide exposure limit at work? OSHA, NIOSH and the ppm numbersOSHA’s legal limit for carbon monoxide is 50 parts per million averaged over 8 hours, in general industry, construction and maritime alike.29 CFR 1910.1000 Table Z-1 and 1926.55 Appendix A (current e-CFR); NIOSH Pocket Guide to CWhat is TWA, STEL and ceiling on an exposure limit?An exposure limit comes in three shapes.29 CFR 1910.1000(a) through (d) and Tables Z-1 and Z-2 (current e-CFR); NIOSH Pocket GuideWhich Draeger tube range covers the OSHA PEL or the IDLH? Reading the limits next to the rangesA Draeger tube only reads inside its measuring range, so the question for any gas is where the exposure limit sits relative to the ranges on offer.NIOSH Pocket Guide to Chemical Hazards (current online edition) for PEL, REL and IDLH as l