Many explosion accidents in industrial production are caused by flammable gas or liquid leakage contact with open flames, some flammable gas is colorless and odorless, even after leakage will not be detected, so gas detector manufacturers recommend installing flammable gas detectors in the environment where there is flammable gas leakage to monitor the concentration of flammable gas. This way, once the flammable gas concentration exceeds the standard, the detector will alarm.