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A semiconductor gas sensor uses a semiconductor gas sensor to contact a gas to cause a change in semiconductor properties to detect a component of a specific gas or to measure its concentration.

Semiconductor gas sensors are generally classified into two types, resistive and non-resistive. Resistive semiconductor gas-sensing sensors use gas-sensitive semiconductor materials such as tin oxide (SnO2), manganese oxide (MnO2) and other gold oxides to make sensitive components when they absorb flammable gases such as hydrogen and carbon monoxide. When alkane, ether, drunk, benzene, natural gas, etc., a reduction reaction occurs, and heat is released to increase the temperature of the element and the resistance changes. By using this kind of semiconductor material, the composition and concentration of the gas are converted into electrical signals for monitoring and alarming.

Figure 4.42 shows the resistance-density relationship of a typical gas sensor. It can be seen that the components are sensitive to different gases, such as acetic acid, ethylene glycol, hydrogen, etc., and have lower sensitivity to methane. Generally, as the concentration of the gas increases, the resistance of the element increases significantly, and within a certain range, it has a linear relationship.