We contrast three well-known gas detectors.
1. Characteristics of semiconductor sensors examined
Gas detectors with semiconductor sensors are created using resistance changes. An alcohol sensor is created based on the idea that when tin dioxide comes into contact with alcohol gas at a high temperature, its resistance would rapidly drop. This sensor is ideal for detecting civil gas because of its inexpensive cost and other features. On semiconductor sensor gas detectors, environmental conditions have a considerable impact, causing unstable detection results. This type of gas detector is also unsuitable for locations where precise measurement is required because the output parameters cannot be determined.
2. Evaluation of combustion sensor properties
On the platinum resistor's surface, the combustion sensor creates a high-temperature-resistant catalyst layer. The flammable gas will catalyze and burn once the temperature is right. The platinum resistor's temperature will rise due to burning, which will also cause the resistance to reflect the flammable gas concentration. The catalytic combustion sensor gas detector can only detect combustible gases; if the gas cannot be burned, the sensor will not respond. The catalytic combustion gas detector has a long service life and responds precisely and rapidly.
3. Analysis of the types of electrochemical sensors
A considerable part of its flammable, toxic and harmful gases are electrochemically active and can be electrochemically oxidized or reduced. The principle of the original battery type gas sensor is roughly the same as that of the dry battery. At present, the detection of toxic and harmful gases mainly relies on constant potential electrolytic cell type gas sensors. Concentration battery type gas sensor can form concentration electromotive force related to gas concentration and detect gas concentration, such as oxygen sensor for automobiles.
