The isoocane c8h18 gas sensor/isoocane c8h18 gas sensor module, which is a catalyst layer prepared for high temperature at platinum resistance surfaces, at a given temperature, in which flammable gases act as catalytic combustion on their surfaces, which is a function of increased platinum resistance temperature, electrical resistance changes, and a variable value is a function of flammable gas concentration. Catalyzing gas sensors selectively detect flammable gases. Advantages: catalysing gas sensors measure accurately, respond quickly and have a long life. The output of sensors is directly related to the explosive hazard of the environment and is a dominant sensor in the field of safety detection. Disadvantages: there is no selectivity within the flammable gas range. Dark fire works, and there is a risk of causing explosions. Most elements of organic vapour are toxic to sensors。