The gas sensing material used in the MQ-7 gas sensor is tin dioxide (SnO2), which has low conductivity in clean air. When carbon monoxide gas exists in the environment where the sensor is located, the conductivity of the sensor increases with the increase of carbon monoxide gas concentration in the air.

Features:

Sensitive for carbon monoxide
Output voltage boosts along with the concentration of the measured gases increases
Fast response and recovery
Adjustable sensitivity
Signal output indicator

Specification:

Power: 2.5V ~ 5.0V
Dimension: 40.0mm * 21.0mm
Mounting holes size: 2.0mm