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In message <UPMAIL08.199701142029550223@ms*.co*>, Steve Merenkov
<Steve_Merenkov@ms*.co*> writes
SNIP.......
>Now, getting to my question, there's been alot of discussion about placing O2
>sensors in humid breathing gas environments such as the inhalation bag of any
>rebreather regardless of design. Cochran has come out with this new device
>called the "Lifegaurd", basically designed to be placed in a rebreather
>inhalation bag.
>
>They state that it uses a 'Water Tolerant O2 sensor' and can supply PO2
>information with a Nemesis IIa Nitrox, type of device.
Steve,
O2 sensors (i.e micro fuel cells) will work in high humidity
conditions. What causes the problems is the formation of water/moisture
on the sensor face which interupts the diffusion of oxygen through the
membrane. Without this turning into a Cochran bashing session, I refer
to my earlier post re:- Drager's comments that at present they were
unable to come up with a suitably moisture tolerant system for them to
use it in an oxygen control system. Notwithstanding that there are ways
to reduce the formation of moisture on the sensing membrane, without
seeing Cochran's product I would reserve any comments.
> They also state that
>it can be plumbed into a semi-closed unit like the Drager Atlantis One.
How would it 'plumb in'. This would have to mean modifying the
inhalation bag.
> This
>solves one of the most basic problems associated with the use of the Atlantis,
>NOT KNOWING what your breathing.
Why do you not know what you are breathing?. You have an analised gas in
the cylinder, you have a figure for a worst case scenario of oxygen
metabolism, a scrubber of known remaining duration, a means of flow
checking the system prior to the dive, a means to check it's still
flowing during the dive.
> Can any of you techno weenies comment on
>this combination. Please don't flame me just for mentinoning, the Atlantis
>and Cochran, I'm concerned more with the theory, then the manufactures
>reputations.
>
>Thanks, Steve Merenkov
Regards
Chris Hellas e-mail - chris@de*.de*.co*.uk*
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