MQ-2 sensor module

The sensitive material of the MQ-2 gas sensor is SnO2, which has lower conductivity in clean air. When the target flammable gas exist, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond to the output signal of gas concentration through a simple circuit. MQ-2 gas sensor has high sensitivity to propane and smoke and can also detect the natural gas and other flammable steam well. It is low cost and suitable for different applications of detecting kinds of flammable gases