Typical safety standards require that a gas detection unit give warnings at 10 – 20% of the LEL. Do not confuse the alarm level with the volume of gas required to reach the LEL. For example: Methane has an LEL of 5% by volume in air. For a gas detector to give an alarm at 10% of the LEL, it must trigger when it detects 0.5% by volume.
[email protected]Gas detector tubes can be used to detect flammable gases, toxic gases and oxygen. The detector tubes consist of a sealed glass tube containing reactive chemicals coated onto inert support particles. Many gas sampling pumps contain a tube tip cutter.
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Get PriceNow, if the sensor for carbon monoxide also responded to propane, this would not be desirable, as the propane would represent an interference, and cause errors in the CO measurement.
Get PriceWater correction automatically reports dry gas mole fractions; Precision at 2 seconds, 10 seconds, and 5 minutes is 1.2, 0.6, and 0.1 parts-per-billion (ppb) for H 2 CO and 20, 10, and 2 ppb for CH 4. H 2 CO rise time (10 – 90%) and fall time (90 – 10%) is less than 1 minute, 0 – 20 ppb. Drift at standard temperature and pressure (STP ...
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Get PriceThe minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air is defined as the Lower Explosive Limit (LEL) for that gas. Below this level, the mixture is too "lean" to burn. The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit (UEL).
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