Description this is a simple-to-use compressed natural gas (cng) sensor, suitable for sensing natural gas (composed of mostly methane [ch4]) concentrations in the air. The mq-4 can detect natural gas concentrations anywhere from 200 to 10000ppm. This sensor has a high sensitivity and fast response time. The sensor and apos; s output is an analog resistance. Good sensitivity to combustible gas in wide range high sensitivity to natural gas long life and low cost simple drive circuit 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. This sensor comes in a package similar to our mq-3 alcohol sensor. Technical parameters: Ambient temperature: -20 ~ + 55 humidity: <=95 percent measure the voltage <=24v characteristics of gas: 5000 ppmm methane.

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