MQ7 Gas sensor carbon monoxide (CO)

MQ-7 semiconductor sensor for carbon monoxide (CO). The sensitive material in the MQ-7 gas sensor is SnO2, which has low conductivity in clean air. When the target gas is present, the sensor’s conductivity increases with the gas concentration. A simple electronic circuit can be used to convert this change in conductivity into a corresponding output signal representing the gas concentration.

Specifications:

• High sensitivity to carbon monoxide (CO)
• Supply voltage: 5 V
• Power: 900 mW (the sensor becomes hot during operation)
• Detection range: 10–500 ppm
• Dimensions: Ø14.5 × 16.5 mm (with pins)

Applications:

• Gas detector for incomplete combustion, e.g. from wood stoves, LPG heaters, and vehicle exhaust gases
• Industrial detector, e.g. for garages
• Portable gas detector
• Popular sensor – many available examples for different platforms