Analog CO/Combustible gas sensor (MQ9)

MQ-9 gas sensor has high a sensitivity to Carbon Monoxide, Methane and LPG. The sensor can be used to detect different gases containing CO and combustible gases.
In stock

VEX Robotics parts ship from Texas

US Schools/School Districts can order by Purchase Order

It is low cost and suitable for different applications.

Sensitive material of MQ-9 gas sensor is SnO2, which has a lower conductivity in clean air. It makes detection by cycling high and low temperature, and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. With high temperature (heated by 5.0V), it detects Methane, Propane etc combustible gas and cleans the other gases adsorbed under low temperature.

Domestic gas leakage detector.
Industrial gas detector.
Portable gas detector.


Analog CO/Combustible gas sensor(MQ9) 1 unit.

More Information
Data Sheets
  • Power supply needs: 5V.
  • Interface type: Analog.
  • Pin Definition: 1-Output 2-GND 3-VCC.
  • Sensor Type: Semiconductor.
  • Size: 40x20mm.
  • Long life and low cost.
  • 10-1000ppm CO.
  • 100-10000ppm combustible gas.
  • Good sensitivity to CO/Combustible gas.
  • High sensitivity to Methane, Propane and CO.