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MQ4-Gas Sensor

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Product Description

This is a simple-to-use compressed natural gas (CNG) sensor, suitable for sensing  natural gas (composed of mostly Methane and Propane) concentrations in the air. The MQ-4 can detect natural gas concentrations anywhere from 300 to 10000 ppm. 


  • Digital output signal which can be directly connected to a microcontroller or relay module.
  • Analog output signal, the higher the concentration, the higher the voltage.
  • Four screw holes for positioning; 
  • Dimensions: L:32mm x W:20mm x H:22mm. 
  • Input voltage: 5 Vdc
  • Special reminder: This sensor needs to preheat around 20 seconds, the sensor generates heat under normal operating conditions due to the internal electric heating wire.


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