Gas Sensor MQ9 Sensitive Carbon Monoxide (CO) & Flammable Gas


Gas Sensor MQ9 Sensitive Carbon Monoxide (CO) & Flammable Gas


MQ9 is a semiconductor sensor which can detect the presence of Carbon Monoxide (CO) gas at concentrations from 100 to 10,000 ppm. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air.

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It’s conductivity increases as the concentration of sensing gases increases. It has also some sensitivity to flammable gas. MQ9 Carbon Monoxide  gas sensor can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc using an Analog to Digital Converter (ADC).



  • Low Cost
  • Stable and Long Life
  • High sensitivity to Carbon Monoxide (CO)
  • Small sensitivity to Flammable gas
  • Simple drive circuit
  • Analog and Digital Outputs
  • Trigger Level configuration Potentiometer



  • Circuit Voltage : 5V ±0.1 AC or DC
  • Heating Voltage : 5V ±0.1 AC or DC
  • Load Resistance : 10KΩ
  • Heater Resistance : 31Ω ±5% at Room Temperature
  • Heating Consumption : < 800mW
  • Operating Temperature : -10°C ~ 50°C
  • Detection Range : 100 ~ 10,000 ppm of Hydrogen
  • Operating Voltage: DC 5V
  • Analog Output (AO): 0~5V analog output voltage
  • Digital Outout (DO): 0V or 5V output
  • Configuration: Through Potentiometer (adjusts the output level transition)
  • Preheat Duration: 20s
  • Weight: 5g
  • Dimensions: 23 x 19 x 19 mm
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