MQ-9 Carbon Monoxide and Flammable Gas Sensor

Product Code: 0744
Availability: In Stock

10 or more $6.69CAD
100 or more $6.29CAD
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This MQ-9 gas sensor detects the presence of Carbon Monoxide at concentrations from 10 to 1,000 ppm and combustible gas from 100 to 10,000 ppm. The sensor’s simple analog voltage interface requires only one analog input pin from your microcontroller.


  • MQ-9 high gas sensor for carbon monoxide, methane, liquefied petroleum gas sensitivity, the sensor can detect a variety of gases containing carbon monoxide and flammable, is a low-cost sensors for a variety of applications
  • Simple circuit can be used to change the conductivity, concentration of the gas is converted to the corresponding output signal
  • Detection method using low temperature cycling (1.5V heating) to detect carbon monoxide, conductivity sensors with carbon monoxide in the air increased with increasing gas concentration, spurious adsorption at high temperatures (5.0V heating) detection of combustible gases methane, propane and cryogenic cleaning gases
  • Sensitive material MQ-9 gas sensor is used to clean the air in the lower conductivity of tin dioxide (SnO2)


  • It adopts high quality double panel design with power indication and TTL signal output indication
  • It has DO switch signal (TTL) output and AO analog signal output
  • The TTL output valid signal is low. (When the output is low, the signal light is on, it can be directly connected to the MCU or relay module)
  • The voltage of the analog output, the higher the concentration, the higher the voltage
  • It has good sensitivity to gas and natural gas detection
  • There are four screw holes for easy positioning
  • Has a long service life and reliable stability
  • Fast response recovery characteristics

Technical Details:

  • Detection of Gas: Carbon monoxide flammable gas
  • Detection of Concentration: 10-1000ppm(CO); 100-10000(Gas) ppm
  • Input Voltage: DC5V
  • Power Consumption (current): 150mA
  • DO Output: TTL digital quantities 0 and 1 (0.1 and 5V)
  • AO Output: 0.1-0.3V (relatively non-polluting), the highest concentration voltage is about 4V
  • Using the Chip: AT89S52
  • Crystal: 11.0592MHZ
  • Baud Rate: 9600

Note: After the sensor is energized, it needs to be preheated for about 20S, and the measured data is stable. The heating of the sensor is a normal phenomenon, because there is a heating wire inside, if it is hot, it is not normal.

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