... 5 year sensor life Product Overview: KQ500 series fixed gas detector(also gas transmitter): with 6 years experience in designing and ... producing detector, we develop our new product with electrochemical sensor. It can ... ,CO,HCN,NO2,SO2,NH3,HCL,CL2,H2 etc. The device adopts intrinsic safety type channel design, standard 4~20mA two ...