Sensitive material of MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When H2S gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ136 gas sensor has high sensitivity to H2S gas, also can monitor organic vapor including sulfur well. It a kind of low-cost sensor for kinds of applications.
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