MQ-4 Methane Gas Sensor

Product Code: 0739
Availability: In Stock

10 or more $5.69CAD
100 or more $5.39CAD
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The MQ-4 Sensor is highly sensitive to methane and natural gas and also has a small sensitivity to alcohol and smoke. This sensor has both analog and digital output and a potentiometer for setting the trigger threshold.


  • 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


  • The gas sensing material used in the MQ-4 gas sensor is tin dioxide (SnO2) with low conductivity in clean air
  • When there is a flammable gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of flammable gas in the air increases
  • A simple circuit can be used to convert the change in conductivity into an output signal corresponding to the gas concentration
  • The MQ-4 gas sensor has high sensitivity to butane, propane and methane, and has a good balance between methane and propane
  • This sensor detects a wide range of flammable gases, especially natural gas, and is a low cost sensor for a variety of applications
  • Suitable for monitoring equipment for liquefied gases, natural gas and gas in the home or industry. Excellent resistance to ethanol and smoke

Technical Details:

  • Detection of Gas: Natural gas/Methane
  • Detection of Concentration: 300-10000ppm
  • 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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