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Date: Mon, 13 Jan 1997 08:29:29 +0000
To: George Irvine <gmiiii@in*.co*>
Cc: cavers@ge*.co*, techdiver@terra.net
From: Chris Hellas <chris@de*.de*.co*.uk*>
Subject: Re: D.E.M.A. SHOW
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*

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