MQ-7 sensor module

MQ-7 Carbon Monoxide gas sensor, CO Gas sensor. The sensitive material of MQ-7 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by method of cycle high and low temperature, and detects CO at low temperature(heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature(heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond to the output signal of gas concentration through a simple circuit.
Detection Gas: CO, carbon monoxide
Detection Range: 10～500ppm CO
Application: domestic CO gas leakage alarm