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Description: This is a simple-to-use liquefied petroleum gas (LPG) sensor, suitable for sensing  LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm.

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.

This sensor comes in a package similar to our MQ-3 alcohol sensor, and can be used with the breakout board below.

Documents:

Comments 16 comments

  • could you please tell me the working principle of MQ6?

  • so is there a way to get this sensor to detect a higher ppm. i need a sensor to tell me when propane gets to 42000 ppm also can this detect Mapp/pro gas

  • Does anyone know if this can detect gasoline fumes as well? Or is there another sensor on sparkfun that can?

  • please help me,in which terminals of MQ-6 gas sensor we have to connect Vcc,output,ground?

  • @zv470 so we can connect any pin 2 5v

  • Would it work if I had a fan sucking in air (at a very low flow rate) to an enclosure with this inside? Or does this need to be exposed directly outside of an enclosure?

    • If it is in the inside of the device, does the device emit any kind of gases or temperatures that may interfere with its operation. I suggest being catious and either leaving it all or mostly external to the device or at least partitioning the gas sensing area from the rest of the device.

  • Friends,
    I have few doubts regarding this sensor.
    I would like to know,
    1. the distance within which the sensor can detect the gas.
    ie., the distance b/w gas source and sensor
    2. Average lifetime of the sensor
    these details are not provided in the datasheet.
    can anyone provide me the answer.

    • The distance measured is probably 0 units of measurement from the interior of the sensor! It does not use radiated or reflected spectral analysis. The wind screen is a good indicator that it needs gases to calmly waft by its “nose” to give accurate and steady measurements. This is all just intuited but I would also say that the fact that the pins are designed like transitor tubes of old, they have limited lifetimes and are meant to be easily replaced.

    • The distance it can detect the gas at is not easy to determine, it has a range of 200 to 10000ppm. It depends of a few variables, I.E. Gas source, leakage rate, room size, air currents, and sensor placement, not the sensor itself as the gas has to accumulate to above 200ppm and physically reach the sensor.
      As for the lifetime I do not know.

  • Has anybody an Arduino example code for the GAS SENSOR MQ-6, taking into account the dependence on temperature and humidity.

  • does anyone ever try this sensor ?
    I’ve bought one,n i try it once but it doesn’t work yet ?
    I suspect the problem from “preheat 48 hour ” ..
    does it mean I have to heat that sensor for 48 hour and never plug out the power for every I use ? or preheat ,it just only for first usage only n for the second one it doesn’t need to be heated 48 hours ??
    thank you

  • @Sency hi, it doesn’t matter which way as u can hookup A to B or B to A, :) Have a look at the datasheet. ;)

  • Does anybody know how to identify the PIN Number 1? (or lets say PIN A1). Both side of the module looking same. I’m confused. :)
    -KUSHAN-


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