Bruce, before you even get to that kind of thing, the fact is that with most
of these ccr's, which are all copies of each other which are copies of the
Navy's MK19, the sensors are downstream of the scrubber. This means they
load up pretty fast. In the Cis Lunar, there is a scheme to blow dilluent
over the sensors and then check them when in doubt as to the reading ( I
have a Cis manual ) , but as Mike Bruic can tell you, this becomes a full
time job after a short while.

 In the MK19, the sensors are not where they are in any of these copy units.
In the Navy's MK16, the are indeed effectively downstream of the scrubber,
but are in a ring in the center of a well-designed double insulated scrubber
that tends to hold the temp of both the sensors and the gas fairly constant
to each other, so you do not get the condensation that you get in the
copies. That scrubber is extremely expensive and a complex design, but it is
the only one that allows the downstream positioning. The rest are bullshit,
cheap ass Rube Goldberg designs with all kinds of silliness .

I personally hate rebreathers, but use them for cave exploration where the
depth is extreme and the bottom times long , mostly for ease of setup and
the thermal considerations. Mine is mechanical, and in most failure modes I
just can not breathe and am forced to go to open circuit with no harm done.
In only one failure mode, it acts like a ccr with no gas coming in or
leaving. I have to spot that failure by no longer hearing the machine adding
gas, which it does on every third breath or so when functioning properly.

 The Desperation rebreather is an inexpensive machine and as such is in wide
use. The problems with it are not well admitted or understood . The
"training" ( pause while I regain my composure ) is the usual tec agency
quickie bullshit in my opinion. My training in learning rebreathers lasted
months, and my track record and the track record of the WKPP in rebreather
diving reflects it. Also, we were forced to train on other machines and deal
with several trainers and situations - after than, you could not get me on a
Desperation  unless I had full blown aids and of course Alzheimer's.



-----Original Message-----
From: Bruce Stewart <bruce@tr*.co*>
To: Paul Braunbehrens <Bakalite@ba*.co*>; techdiver@aquanaut.com
<techdiver@aquanaut.com>
Date: Saturday, June 17, 2000 2:22 AM
Subject: Re:Inspiration death AGAIN!


>Paul,
>
>its not for lack of trying, sometime ago I mailed the
>company that manufacture the unit and suggested that they
>place a flow restricting orifice in the O2 addition line so
>you couldn't very quickly flood the thing with 100% O2
>at depth which is probably a likely cause of a few deaths.
>I suggested a few other things as well.
>
>I heard nothing.
>
>The unit works but its not idiot proof, (nor is any breather
>for that matter) but when you look at the ratio of units sold to
>deaths in the period its been available its up there with
>very high altitude mountaineering!! I don't know how
>many have gone out the factory door but a death rate of
>1 in 100 might not be unreasonable over the period its been
>offered.
>
>I think E Kalayci nailed it when he mentioned "Training" in
>a recent post, the courses are probably too short and the
>people who buy them are not seriously challenged whether
>they have the "right stuff" or not to dive a breather.
>
>I'm not trained to use the unit or any other
>breather for that matter but I've had a long time interest
>in them and I wouldn't dive it unless it was modified.
>
>Whats next? well more people will die and lots more units will
>be sold but a time will come when governments will step in
>and say enough and definitely no more diving them outside
>your bath tub.
>
>B
>
>
>
>At 09:29 15/06/00 -0700, Paul Braunbehrens wrote:
>>Ingemar Lundgren wrote:
>>~
>>>Another diver, Ian Swift died diving an Inspiation yesterday off of
Weymoth
>>>UK.
>>>This is the second death this week.  What is the death count up to now?
>>
>>What is "inspiration", a rebreather?  If so many people are dying
>>with it, why isn't anyone sueing the company and putting out a recall?
>>--
>>Paul Braunbehrens mailto:Bakalite@ba*.co*
>>http://www.daw-mac.com Mailing list for digital audio on the mac
>>--
>>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>
>Bruce Stewart
>Triton Diving Equipment
>www.triton-dive.com
>
>Lights, Backplates, Harnesses
>Dry Suits, Bags, Rebreather Parts
>Custom manufacturing
>Available only on the Net
>
>
>
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

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