Re: [PSUBS-MAILIST] test of CO2 safety hardware - any volunteers?

[Warren Greenway <opensourcesub@yahoo.com>]

Hey man, I design those instruments! I don't trust 
them!

Warren.

--- Gail Paleka <gailpaleka@yahoo.com> wrote:
> Erik, 
>  
> There are professionally-made devices that measure
> Carbon Dioxide.  I'm wondering how accurate and
> useful a device like the one you describe would be. 
> Also, it seems to me you'd know when there is too
> much CO2 in the air because it will become difficult
> to breathe.  I think the body's natural sensitivity
> would be more accurate than the device you're
> describing; and it would be one less mechanism to
> monitor.  Furthermore, with reliable
> professionally-made devices being available, why
> would you want to entrust something as important as
> life support to a $0.50 expedient? 
>  
> From what I've learned, CO2 levels are taken care of
> by the scrubber, and it's pretty easy to verify
> whether or not that's working.  So this home made
> CO2 sensing device doesn't sound necessary.
>  
> What does seem necessary is a way to monitor Oxygen
> in the air because if that runs low you won't know
> it, you will just pass out.  There are also
> sensitive professionally-made devices that measure
> O2.  And from what I've read, people who operate
> submarines can also do that via a barometer which
> shows the pressure-drop caused by O2 that's been
> absorbed in the body.  Speaking for myself, I think
> I'd prefer the professional instrument.  
>  
> Best, 
>  
> Gail
>  
>  
> 
> Erik Muller <emuller@naic.edu> wrote:
> Perhaps, but perhaps it is worth testing to see.
> Besides, the system can 
> be reset by putting a little bit of alkali into the
> solution. There is 
> nothing like testing a new idea, even if you are not
> convinced that it 
> is any good and you may be surprised. In fact, the
> cost for this system 
> will always be completely paltry, i.e. <$0.50 per
> use. Yes, 50c, and to 
> be honest, probably a lot less than that.
> EM.
> 
> NeophyteSG@aol.com wrote:
> 
> > In a message dated 2/13/04 8:17:13 AM Pacific
> Standard Time, 
> > opensourcesub@yahoo.com writes:
> >
> > Hmmm. True. What about using a ring of smaller
> samples
> > that are opened/closed either at specific time
> > intervals or when they change color? That way you
> > could take multiple samples to increase the
> useability
> > of the system.
> >
> > Thought about the gatling-like arrangement for
> this as well as for a 
> > CO2 scrubber system, but I still get the feeling
> that when all is said 
> > and done it still won't be better in terms of
> cost, sensitivity, 
> > accuracy and usability than an inexpensive CO2
> sensor/voltmeter 
> > arrangement.
> > 
> > *****
> >
> > "Call nothing thy own except thy soul.
> > Love not what thou art, but only what thou may
> become.
> > Do not pursue pleasure, for thou may have the
> misfortune to overtake it...
> > Live in the vision of that one for whom great
> deeds are done ..."
> >
> > Man of LaMancha, D. Wasserman
> 
> 
> 
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