Propane Sensor Module

Propane sensor module generally has semiconductor type and catalytic combustion types. The semiconductor propane sensor uses tin oxide, which has a low conductivity in clean air, as the gas-sensitive material. In clean air, the oxygen adsorbed on the surface of the tin oxide will bind the electrons in the tin oxide, resulting in a state where it is difficult for the electrons to flow. In a leaking gas (reducing gas) environment, the oxygen on the surface reacts with the reducing gas and disappears, and the electrons in the tin oxide regain their freedom, by which the electrons flow freely. The conductivity of the sensor increases with the concentration of combustible gases in the air. The change in conductivity can be converted into an output signal corresponding to the concentration of that gas using a simple circuit.

Catalytic combustion type propane sensor works according to the principle of catalytic combustion effect, by the detection element and compensation element paired composition of the bridge arm, when encountered with flammable gas detection element resistance rises, the bridge output voltage changes, the voltage change with the gas concentration increases into a proportional increase, compensation element to play a parametric and temperature and humidity compensation role.