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Cheap & effective manometer


Posted by Will on August 24, 2000 at 15:17:55:

Hi All,

Being new to CPAP, (1 week), I have all sorts of ignorance to overcome. One of those things was the feeling that the CPAP preasure was slowly reducing on a night-to-night basis.
Was this me getting used to CPAP, or was the machine really going bad on me?

After reviewing my old textbook, "Physics for the Health Sciences", and some internet research I hit upon a solution to my question. I have the F&P HC100 humidifier which uses the HC300/325 water chamber. This chamber has 2 ports, one for the CPAP machine & one for the hose that runs to my mask. I took a clear straw about 1' long, and made a mark about 1" from the end, then using my metric ruler I made another mark 13cm from the first mark. I placed a cork on the end with the mark 1" from the end, such that the 1" mark was about 1" below the cork. Then the cork and straw was inserted into one of the ports of the HC300 then I added water into the chamber until the 1" mark was right at the water line. Next I hooked up the CPAP to the other port and turned it on.

Guess what? The water rose up the straw to the 13cm mark. Since my perscription is 13cm/h2o, I was pretty pleased.

Total cost of my manometer, $0.50. Cost of my peace of mind, priceless!

BTW, the diameter of the straw is not important, as long as it doesn't pull water up by capillary action.

Will

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