1. Characteristics of semiconductor sensors examined
Gas detectors using semiconductor-type sensors are created based on changes in resistance. Tin dioxide's resistance will rapidly reduce when it comes into contact with alcohol gas at a high temperature, and an alcohol sensor is created employing this idea. This sensor is particularly effective at detecting domestic gas and has low cost qualities. Semiconductor gas detectors are susceptible to environmental variables, which causes unreliable detection findings. Additionally, it is impossible to ascertain the output parameters of this gas detector, making it unsuitable for locations where precise measurement is necessary.
Second, the combustion sensor analysis's features
The platinum resistor's surface must have a high temperature resistant catalyst layer created by the combustion sensor. The combustible gas will be catalyzed and burned when the temperature is high enough. The combustion will raise the platinum resistor's temperature, and the concentration of the flammable gas will be reflected through the resistance. The catalytic combustion sensor gas detector can only detect combustible gases; if the gas cannot burn the sensor, it will not respond. Catalytic combustion gas detectors have a long working life and are precise and quick to react.
Three, a study of electrochemical sensor types
Its flammable, poisonous, and hazardous gases can be electrochemically oxidized or reduced, making up a sizeable portion of them. The dry cell and the galvanic cell type gas sensor operate on approximately the same principles. Constant potential electrolytic cell type gas sensors are now the primary method for the detection of poisonous and dangerous gases. The concentration cell type gas sensor, like the oxygen sensor for autos, may create a concentration electromotive force corresponding to the gas concentration and detect the gas concentration.
