MQ-3B

The gas sensor used in MQ-3B gas sensor is tin dioxide with low conductivity in clean air. When there is alcohol vapor in the environment where the sensor is located, the conductivity of the sensor increases with the increase in the concentration of air alcohol vapor, Use a simple circuit to convert the change of conductivity into an output signal corresponding to the gas concentration.

MQ-3B gas sensor has high sensitivity to alcohol and can resist the interference of gasoline, smoke and water vapor. This sensor can detect alcohol atmospheres of various concentrations and is a low-cost transmitter suitable for various applications.