Rich,
    Are you saying that they have solved all the problems and that they =
now have a waterproof O2 sensor that works. I want some of that Wonder =
Icing you have on your cake. And to think just this past weekend there =
was no solution to this fatal design flaw. The "Experts" at DEMA must be =
surprized.

Barry

----------
From: 	Richard Pyle[SMTP:deepreef@bi*.bi*.ha*.or*]
Sent: 	Monday, January 13, 1997 6:43 AM
To: 	George Irvine
Cc: 	Chris Hellas; George Irvine; cavers@ge*.co*; techdiver@terra.net
Subject: 	Re: D.E.M.A. SHOW



It seems like you think you understand everything about the unit, but =
you=20
don't.  Blowing water off the sensors is the icing on the cake.  The =
real=20
advantage is a method that, within the confidence levels of laws of=20
physics and the O2 content of your diluent, allows you to verify the=20
validity of the readings.  You might call a 10-second proceedure done=20
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=20
> in a rebreather), and Draeger recognizes this. Stone is still trying =
to come  up=20
> with various Rube Goldberg schemes to deal with this, but the problem =
he is=20
> compounding in the process is the task loading, which is what kills =
rebreather=20
> divers on closed circuit (even if the machine deos not get them) . =
Stone has=20
> added audible warnings for this, but then you have to assume all of =
this works,=20
> and all of it is getting its information from sensors that do not do =
well in=20
> humidity, so we have nothing useful for cave diving other than our =
rig, and it=20
> is quite obvious that we have proven that .
>=20
>    What really amazes me is that the other manufacturers, who are =
really just=20
> shade tree operators , keep pretending these things work. I am not =
including=20
> Stone in that category, has the mere fact that he as tried to offer a =
sytem to=20
> deal with the problem indiceates that he is firumly aware of it, while =
the=20
> others are rolling the dice. Just remember, Gavin wontl; dive one, and =
he is the=20
> EX19 and MK 16 guy , and all of us will dive mine, so what does that =
tell you.
>=20
> 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=20
> at=20
> >>solving the sensor problem (blowing dry gas over them - he used to =
heat them,=20
> >>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.=20
> >
> >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
> >
> >=20
> >Chris Hellas         e-mail - chris@de*.de*.co*.uk*
> >
> >
>=20
>=20
> 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*
>=20
>=20
> --
> Send mail for the `techdiver' mailing list to =
`techdiver@aquanaut.com'.
> Send subscription/archive requests to =
`techdiver-request@aquanaut.com'.
>=20

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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