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This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.

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7.00 JD


Sensitive material of SainSmart MQ-4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exists, The sensor's conductivity is higher along with the gas concentration rising. Please use simple electro circuit, Convert change of conductivity to the corresponding output signal of gas concentration.
SainSmart MQ-4 gas sensor has high sensitivity to Natural Gas, Methane, and could be used to detect both Methane and Propane. The sensor could be used to detect different combustible gas especially Methane, it is with low cost and suitable for different application.


  • High sensitivity to Combustible gas in wide range
  • High sensitivity to Natural gas?Methane?Coal gas?CO etc gas
  • Fast response
  • Wide detection range
  • Stable performance, long life, low cost     
  • Simple drive circuit


  • Domestic gas leakage detector
  • Industrial Combustible gas detector
  • Portable gas detector
  • Gas leak alarm, Gas detector


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