On Tue, Jul 04, 2006 at 12:59:11AM +1200, Russell McMahon wrote:
> I wish to build a Capnograph.
> Don't know what that is?
> I didn't either until yesterday - even though I wanted one.
> It's an instrument to measure exhaled CO2 content.
> Exhaled CO2 content is typically in the range 2% - 10.%
> Y.CO2.M.V.

Russell, could you use the quantitative lab method? Pass the exhaled air
through concentrated sulfuric acid, to remove the H20, and then through dry
NaOH. Then measure the before and after  mass difference of the NaOH
container. Is this method used any longer? Is there a better method to use
to make this measurement?

Take care.

Matthew

-- 
Necessity is the plea for every infringement of human freedom. It is the
argument of tyrants; it is the creed of slaves.
                                                  -- William Pitt, 1783
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