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2240 - Portable Hydrogen Leak Detector

What is the effect of ammonia on the H2 sensor?
My department just bought one of your handheld hydrogen detectors, model 2240. I need to know at what liter per minute to flow the calibration gases and is it the same for all gases (ex: zero air, 20,000ppm, 1000ppm)? Also, is there any preference concerning the tubing material used to deliver the hydrogen? With other gas sensing monitors we own I have to use certain tubing because the calibration gas will degrade other materials.


What is the effect of ammonia on the H2 sensor?

NH4, or ammonia, could have an effect on the sensor.There is the concern that NH4 would break down on the surface, "potentially" causing a false H2 reading. While this is not proven, we simply don't have much testing with ammonia in relation to our sensor technology.

Another area of concern is that ammonia in combination with any moisture would become corrosive and begin to break down the housing of our unit which is aluminum.

We are looking into this issue, but at this time more testing needs to be done.


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My department just bought one of your handheld hydrogen detectors, model 2240. I need to know at what liter per minute to flow the calibration gases and is it the same for all gases (ex: zero air, 20,000ppm, 1000ppm)? Also, is there any preference concerning the tubing material used to deliver the hydrogen? With other gas sensing monitors we own I have to use certain tubing because the calibration gas will degrade other materials.

About 0.5-1.0 liter/minute would be appropriate for all gases. Hydrogen is unlikely to degrade most tubing material. If you are having issues with the model, a factory calibration is highly recommended over the field calibration.


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