... year sensor life Product Overview: KQ500 series fixed gas detector(also gas transmitter): with 6 years experience in designing and producing ... , petrol, petrifaction, chemistry, light industry, coking, municipal administration, gas, pharmacy, sewage dealing and many other special industries and fields ... various gases such as flammable gas, O2,H2S,CO,HCN,NO2,SO2,NH3,HCL,CL2,H2 etc. The device adopts ...