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According to hazards, we classify poisonous and harmful gases into combustible gases and toxic gases. Because of their different nature and hazards, their detection methods are also different.
In China, due to historical and cognitive reasons, there are still many problems in the selection of various types of gas detectors, which are embodied in: 1) The detection of combustible gases is more important than the detection of toxic gases. 2) The detection of gases that may cause acute poisoning is more important than the detection of gases that may cause chronic poisoning.
The lessons learned from the explosion of many combustible gas leaks have made people attach great importance to combustible gas detectors. It can be said that any petrochemical and chemical plant and most hazardous gas detectors are LEL detectors. But only with the LEL detector is still not enough to truly protect the safety and health of workers.
Select the appropriate poisonous and harmful gas detector to be sure to confirm the type and concentration range of the gas to be detected: The gas types encountered by each production department are different. When selecting a gas detector, all possible conditions must be taken into consideration. If methane and other less toxic alkanes are present, selecting the LEL detector is undoubtedly the most appropriate.
It is undeniable that most of the volatile hazardous gases are combustible gases. However, the catalytic combustion combustible gas detector (LEL) is not the best choice for all flammable gas detection. It is designed specifically for the detection of methane, and its detection performance for other substances is poor. Therefore, they can detect lower concentrations of combustible gases other than methane that are much higher than their allowable concentrations.
The choice of poisonous and harmful gas detector
At present, our understanding of toxic and harmful gases is still more focused on combustible gas, gases that can cause acute poisoning (hydrogen sulfide, hydrogen cyanide, etc.), and some common toxic gas (carbon monoxide), oxygen, and other detectors.