MST133 Semiconductor sensing series H2S Sensor gas sensor
MST133 gas-sensitive material used by the gas sensor is tin dioxide (SnO2), which has a low
conductivity in clean air. When the sensor encounters the detected gas, the resistance of the
sensor changes, and the conductivity of the sensor increases correspondingly with the increase of
the detected gas concentration. According to this characteristic, a simple test circuit can be
designed to convert the change of conductivity into a signal output corresponding to the change of
gas concentration, so as to realize the detection of gas.
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