Plain-language explanations of the measurements, sensors and numbers behind environmental monitoring.
PPM is parts per million: gas molecules per million molecules of air. 10,000 ppm is 1 percent by volume, and 50,000 ppm of methane is its explosive limit.
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A single-gas monitor watches one known hazard; a four-gas monitor watches O2, LEL, CO and H2S in unassessed spaces. Confined-space entry needs four-gas.
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Refrigerant detectors sense halogenated refrigerants; combustible gas detectors sense methane and propane. Only a dual-chemistry unit like the DRX3 does both.
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Both are heated-diode units. The DR58 states 0.03 oz/yr, a 300 hour sensor and 18 hour battery; the DRX3 adds A3, combustible gas and a replaceable sensor.
Read Article→The DRX3 covers A3, A2L and A1 refrigerants plus combustible gases on a replaceable heated-diode sensor. The DR82 is infrared with a stated 10-year sensor.
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The PT520A adds a 17-inch gooseneck, a 50 to 10,000 ppm range, a mute and a case. The PT199 is pocket-sized, tops out at 1,000 ppm and costs less shelf space.
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Both cover 50 to 10,000 ppm of methane on a gooseneck. The ET120 wins on volume and two switchable ranges; the PT520A on mute, auto power-off and finer bars.
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A laundry room with a gas dryer gets its own alarm, high for natural gas or low for propane, clear of exhaust, lint and steam. Sweep the connector after moves.
Read Article→A room with a gas fireplace gets its own gas alarm, high on a side wall for natural gas or low for propane, never on the mantel, plus a CO alarm per its manual.
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A plug-in gas alarm needs no permission or drilling and leaves with you. Put it in the kitchen outlet farthest from the stove; add a pocket sniffer for move-in.
Read Article→For any home with gas piped in and people sleeping there, yes. A fixed alarm covers the hours your nose is off duty; a sniffer finds the bad connector.
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Any gas that burns: methane, propane, butane, LPG, hydrogen, alcohol and solvent vapors. Not carbon monoxide, carbon dioxide, refrigerants or smoke.
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