MQ-7 Gas Sensor

Sensitive the material of the MQ-7 gas sensor is SnO2, which with lower conductivity in clean air. It makes detection by method of cycle high and low temperature and detect CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When the high temperature (heated by 5.0V), it cleans the other gases adsorbed under low temperatures. Please use simple electro-circuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-7 gas sensor has a high sensitivity to Carbon Monoxide. The sensor could be used to detect different gases contains CO, it is at low cost and suitable for different application.