H2 meter

[xxalexx at ix.netcom.com]

> Date:          Thu, 3 Sep 1998 11:04:43 -0500 (CDT)
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> 
> > > > > 3) H2 concentrations are about 1/2 CO concentrations, at all 
> > > > > mixtures.
> > > > > 
> > > > > CO can be detected using IR spectrometry, but H20 has an 
> > > > > overlapping range, so exhaust gas must be dried to get an 
> > > > > accurate reading. This is obviously impractical for a view as you 
> > > > > drive type guage.  
> > > > > 
> > > > Modern instrument gradeCO NDIR analyzers are not sensitive to water 
> > > > vapor, typically less than 0.1% of FS using a CO2 water bubbler.
> > > > They are not designed for watervapor to condense in the cell, this
> > > > will create noise of up to +-10% FS
> > > > If you have a CO meter that is senstive to water vapor the standard
> > > > practice is to use a calcium carbonate desicant, a correction formula
> > > > is in 40 CFR 86.
> > > > There are also FTIR analyzers in use which can use
> > > > software correction for most interference conditions.
> > > > I have also tried mass spectrometry but there is a huge CO2 
> > > > overlap, so you must use special cryo trapping.  Horibia
> > > > just came out with a commercial  MS  system, but I have not reviewed 
> > > > it.  For exhaust sample water elimination at least 2 filters or 
> > > > needed Balston makes several grades of coaelesing filters for 
> > > > automotive use.
> > > > > But the question is, is H2 spectrometry doable in this case?
> > > > >  
> > > > This method was standard practice for many moon's, probably
> > > > since 30's? I used a Baily combustable A/F meter untill 77 at Carter
> > > > Carb. we then went to 5 gas analysis and in 78 to Horibia A/F meter
> > > > for faster response.
> > > > The Bailey unit burned 100% H2 gas and has I recall was not very
> > > > good  above 14.7.  Handheld portable H2 are widely used in chemistry
> > > > industry for flammable gas safety. very sensitive, we could detect
> > > > H2 gas from can of soda.  I was looking into the sensors about 10 yrs
> > > > ago, the price varies alot, handhelds under $200?, I did remember 
> > > > finding just sensor for about $30 somewhere.
> > > > alex  
> 
> 
>