The WSP7110 type hydrogen sulfide sensor adopts advanced plane production technology to form heater and metal oxide semiconductor gas sensor material on a micro Al2O3 ceramic substrate, which is led out by electrode leads and packaged in metal tube base and tube cap. When the detected gas exists, the higher the concentration of the gas in the air, the higher the conductivity of the gas sensor. This change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit.