MQ138 Semiconductor Sensor for Organic Steam Sensitive material of MQ138 gas sensor is SnO2, which with lower conductivity in clean air.
When the target Organic Steam exist, The sensor’s conductivity is more higher along with the gas concentration rising.
Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
MQ138 gas sensor has high sensitity to Toluene, Acetone, Ethanol and Formaldehyde, also to other organic steam.
The sensor could be used to detect different organic steam, it is with low cost and suitable for different application.
Character * Good sensitivity to Organic Steam * High sensitivity to Toluene, Acetone and Ethano...

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