Hot wire alcohol sensor adopts the principle that the gas is adsorbed on the surface of the metal oxide semiconductor to generate a change in thermal conduction and electrical conduction. The concentration of the gas is measured by the change in the resistance of the platinum coil. The hot wire alcohol sensor is composed of two arms of the bridge, which are paired with the detection element and the compensation element. The resistance of the detection element decreases when the alcohol is encountered, and the output voltage of the bridge changes. For reference and temperature compensation.
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