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Water Vapour content testing
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EmissionO Offline
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Post: #1
Water Vapour content testing
As the title says really.

How do we test to see how much of our gas is made up from water vapour?

Obviously we need to get the heat out of our cells but at what point (temp of the electrolyte) does the water vapour content become no longer the primary concern.

I have read that it may not be water vapour but HHO Mist......what is this?
02-23-2012 04:22 AM
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mike Offline
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Post: #2
RE: Water Vapour content testing
There's no such thing as HHO mist at the temperatures and pressures we are dealing with. The temps needed to make hydrogen and oxygen condense into a liquid are 100s of degrees below 0, and the pressure required is orders of magnitude higher than what we are dealing with using electrolyzers (ie 1,000s of PSI).

The biggest thing that skews the results of HHO volume testing is temperature. If you get a cell running hot, then that makes the gas expand. That way the same amount of gas can take up twice the volume, and then you have "doubled" the LPM of your gas output. In actual fact the exact same gas at room temperature would take up 1/2 the volume and therefore have 1/2 the LPM. This is just an example, and an extreme example at that. But its just to get across the idea.

That's one of the reasons good researchers use a properly calibrated device such as the Alicat Scientific flow meter. It will compensate for temperature so that a gas at 120 degrees will read the same volume as if it was at 72 degrees.

As to your first question, you can eliminate the water vapor by cooling the gas before your measurement. Run the gas through a couple of bubblers, and a couple of large volume dryers or water traps, and then put your flow meter at the end of all of that. The moisture will condense as the temperature comes down to room temperature. There will always be some water vapor, but at room temperature, the amount of water vapor will be a relatively constant amount.

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02-23-2012 01:54 PM
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