It seems like you think you understand everything about the unit, but you 
don't.  Blowing water off the sensors is the icing on the cake.  The real 
advantage is a method that, within the confidence levels of laws of 
physics and the O2 content of your diluent, allows you to verify the 
validity of the readings.  You might call a 10-second proceedure done 
once every 15-20 minutes "task loading", but I would not.

Aloha,
Rich

>   Chris - this is exactly true - the sensors do not like being in humid gas
(as 
> in a rebreather), and Draeger recognizes this. Stone is still trying to come 
up 
> with various Rube Goldberg schemes to deal with this, but the problem he is 
> compounding in the process is the task loading, which is what kills
rebreather 
> divers on closed circuit (even if the machine deos not get them) . Stone has 
> added audible warnings for this, but then you have to assume all of this
works, 
> and all of it is getting its information from sensors that do not do well in 
> humidity, so we have nothing useful for cave diving other than our rig, and
it 
> is quite obvious that we have proven that .
> 
>    What really amazes me is that the other manufacturers, who are really just 
> shade tree operators , keep pretending these things work. I am not including 
> Stone in that category, has the mere fact that he as tried to offer a sytem
to 
> deal with the problem indiceates that he is firumly aware of it, while the 
> others are rolling the dice. Just remember, Gavin wontl; dive one, and he is
the 
> EX19 and MK 16 guy , and all of us will dive mine, so what does that tell you.
> 
> On Mon, 13 Jan 1997, Chris Hellas <chris@de*.de*.co*.uk*> wrote:
> >In message <199701121822.KAA22567@m2*.in*.co*>, George Irvine
> ><gmiiii@in*.co*> writes
> >
> >Snip.....
> >
> >>
> >>   We had the only new rebreather technology, Stone had the only new
attempt 
> at 
> >>solving the sensor problem (blowing dry gas over them - he used to heat
them, 
> >>and before that he had Rosary Beads attached to them.
> >
> >G
> >
> >   Interesting that you point this out - I'm sure most people do not
> >know the problems.
> >
> >As regards the use of active oxygen control systems on closed circuit
> >rebreathers it's maybe worth remembering a conversation I had with
> >Drager in mid 1996. 
> >
> >You may or may not know that they dabbled in electronic C2 a couple of
> >years ago (SMS2000E) and decided not to persue the concept. They have a
> >100 metre semi closed self mixing gas unit (military) - the M100M. It
> >seemed a logical question as to why they never persued the electronic
> >avenue. The answer was short but interesting.......
> >
> >        "until such time that we can develop a suitably moisture
> >tolerant oxygen monitoring system we do not envisage entering the market
> >with rebreathers that have electronic control systems"
> >
> >Food for thought........
> >
> >Regards
> >
> > 
> >Chris Hellas         e-mail - chris@de*.de*.co*.uk*
> >
> >
> 
> 
> George M. Irvine III
> DIR WKPP
> Woodville Karst Plain Project
> 1400 SE 11 ST Ft Lauderdale, FL 33316
> 954-493-6655 FAX 6698
> Email gmiiii@in*.co*
> 
> 
> --
> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> Send subscription/archive requests to `techdiver-request@aquanaut.com'.
> 

Richard Pyle
Ichthyology, Bishop Museum
1525 Bernice St.
Honolulu, HI 96817-0916
PH: (808) 848-4115 / FAX: (808) 841-8968
email: deepreef@bi*.bi*.ha*.or*

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