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Description: This is a simple-to-use hydrogen gas sensor, suitable for sensing hydrogen concentrations in the air. The MQ-8 can detect hydrogen gas concentrations anywhere from 100-10000ppm.

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 8 comments

  • i made an adapter that might be useful for this to ¼" hose http://www.thingiverse.com/thing:137312

  • Will this detect an isotope of hydrogen such as deuterium?

  • I’m curious about the detection of Carbon Dioxide? I’ve seen a bunch of the MQ for a variety of different gasses, but none for CO2. Is this just really difficult to make at a consumer price?

  • Shit, I got some of these and some of the Methane sensors (http://www.sparkfun.com/products/9404) in the same shipment, and can’t figure out which is which!

    • That’s a predicament. I looked at the data sheet, and they appear to be exactly the same electronically and dimensionally. However, the Load Resistance and Heater Resistance is a little varied. Maybe try hooking it up and measuring these variables.

      Or, (and I’m almost completely serious) you could fart on them and see which one reacts more ;)

  • Just noticed this on the data sheet: “Preheat time: Over 24 hour”. The other gas sensors SFE sells also seem to have such pre-heat times.
    This seems suitable for an always-on gas monitoring station, but not much use for a portable quick/brief-use type instrument. I guess it might work if you kept the instrument in hot-standby on a charging cradle…

    • That time refers to how long you have to keep it on when you first get it to “bake” the electronics properly. After that first 24 hour break-in period, you can, and should, use it with a lot shorter warm up time of a minute or so. Keeping it warmed up all the time will make it a lot less sensitive.

    • That’s for when you want to reflow solder it ;)


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