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To: "A.APPLEYARD" <A.APPLEYARD@fs*.mt*.um*.ac*.uk*>
Subject: Re: automatic mixture rebreathers: when oh when?
From: Richard Pyle <deepreef@bi*.bi*.ha*.or*>
Cc: techdiver@opal.com
Date: Fri, 1 Jul 1994 10:22:45 +22305714 (HST)
On Fri, 1 Jul 1994, A.APPLEYARD wrote:

>   I am sorry to reiterate, but among all the flaming etc and intricate
> technical discussions has anyone any idea when we will see in the diving gear
> shops a simple plain reasonably cheap and reliable, not burdened with too much
> to go wrong, automatic mixture rebreather with bag, canister, oxygen cylinder,
> air (as diluent) cylinder, robust small ppO2 detector, a little simple
> electronics to automatically keep the ppO2 at 1.2 ats, and as little as
> possible else? (It could have a separate high-pressure air (diluent) outlet
> that he can put an aqualung-type regulator on as a baleout if he wants to.)

Geez - you don't want much, do you :-)  My impression is that a unit
meeting all of your criteria will not exist anytime soon.  However, a unit
meeting most of your criteria should be available for purchase later this
year.  The basic trade-off is capabilities v.s. cost.  At one end of the
spectrum is the Cis-Lunar unit.  25 will be built this year, all of which
(according to my understanding) have already been sold.  But it all goes
well, they'll offer more next year.  They have just about all of the
criteria you ask for, plus way more than you probably want, and cost
around $12,000-$15,000.

At the other end of the spectrum is the Prism built in the U.K.  It is
supposed to be available this year in th $4,000 - $5,000 range, but does
not have as much sophisticated electronic controling systems as the
Cis-Lunar rig.  The Prisim will be available for demo at Hal Watts' 40
Fathom grotto through the month of July.

There are a number of other units which fall somewhere in-between.

My advice is to attend tek 95 in San Francisco (January), where the
horizon on available rebreathers will be much clearer.

Aloha,

Rich

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