Re: [PSUBS-MAILIST] measurment of CO content.

[Brent Shaw <drydivenz@yahoo.com>]

Erik
in my design (dry ambient) i'm planning on using two
oxygen senors. one to read air content entering the
cabin from scuba tanks (pp20.9 at 1 ata) and the other
for reading cabin air content. all readings will be
PP02 
This way I will be able to see the build up of co2
Brent 

 Erik Michael Muller <emm03@uow.edu.au> wrote:
> Hi folks,
> I am new to the list, but am keen to construct a dry
> ambient
> submersible...if I can get anywhere near enough
> money together.
> Anyhow,
> After scouring the archives and the web, I have been
> unable to find
> any discussion on a way to measure the CO build up,
> real-time:
> 
> In the case of an ambient sub, I am thinking that
> for shallow depths
> where air is not consumed very quickly, especially
> considering there
> is no physical exertion, then the limit of dive time
> might be more a
> dependant on how quickly CO builds up.  I suppose
> this is in turn
> dependant on how big a volume you are breathing, but
> does anyone have
> ideas of how soon the air becomes too toxic to
> usefully stay
> awake?I.e., how many times can I realistically and
> safely breathe the
> same volume of air?
> 
> This led onto a thought of how to measure CO content
> in the air. Does
> anyone know of a simple way to do this?  My crazy
> brain went on to
> design a device where the ambient air is bubbled
> through a solution
> containing some colored pH indicator, which i
> thought would become
> redder as carbonic acid from the CO in the air built
> up, although I am
> not sure how practical this is. If anyone wants to
> try it, I would be
> very interested to find out (red cabbage is
> hideously expensive in
> Australia, and black market red cabbages are no
> good).
> 
> Anyhow, I hope I havent said anything outrageously
> silly/contraversial
> or annoying...
> Thanks!
> E.Muller


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