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jd950
January 13th, 2012, 07:00 PM
According to Aqualung, their Supreme regs are "Specially adjusted to resist freezing." I have found some reference to this being a change in the MP adjustment, but I do not understand how this impacts freezing or "performance" of the regulator. Also, could one not simply make this adjustment on a non-supreme reg and accomplish the same thing? I gather there is some reason one would not want a regulator adjusted this way if not diving in cold water.

Any help?

Fishpie
January 13th, 2012, 07:13 PM
I sure there will be better and more detailed explanations to follow but in a nutshell if the Intermediate Pressure is reduced cooling and possible ice formation is also reduced. The downside is that gas flow is also diminished a bit, theoretically reducing performance.

Six2Life
January 14th, 2012, 01:34 AM
I asked basically the same question here (http://www.scubaboard.com/forums/repairing-your-own-gear/403838-unsealed-conshelf-supreme-ip-spec.html). What I gathered from that thread is that the Supreme is somewhat detuned to help reduce the chances of freezing, along with the secondary seal. Detuning an unsealed conshelf (XIV, XXI, XXII, etc) should improve it's cold water performance, as detuning any reg would.

j2s
January 14th, 2012, 11:24 AM
I sure there will be better and more detailed explanations to follow but in a nutshell if the Intermediate Pressure is reduced cooling and possible ice formation is also reduced. The downside is that gas flow is also diminished a bit, theoretically reducing performance.
So if I hook my IP gauge up and adjust the MP pressure on the 1st stage to the lower end of specs [factory/manual recommends btx 9-10] this will lessen possibility of icing ???.....

EODiver
January 14th, 2012, 11:53 AM
So if I hook my IP gauge up and adjust the MP pressure on the 1st stage to the lower end of specs [factory/manual recommends btx 9-10] this will lessen possibility of icing ???.....
Basically, yes. Air flow is decreased, and doesn't get as cold. I don't have my manuals in front of me, they are in the dive locker at work, but I believe a Conshelf is set about 10-15 psi (1 bar) higher than a Conshelf Supreme. Then you have the enviro seal that keeps everything away from the internals, except for your liquid buffer.

jd950
January 14th, 2012, 11:55 AM
I should have searched, I see this has been answered before, at least in part. At least on the "older" legend regs the specs called for an MP setting of 1377 psi (standard) and 1237 psi (supreme).

So a standard can simply be adjusted down to match the supreme.

That leads me to wonder if this difference in IP would be be noticeable to a diver. If using a Supreme for warm water is it worth adjusting up to 135 or so?

EODiver
January 14th, 2012, 12:06 PM
Yes, you can adjust it to a lower IP, but you don't have the additional enviro seal. I can't tell any difference between my Conshelfs and my Conshelf Supreme, but I like my Supreme better. Most of my diving is 35' or less and visibility measured in inches not feet. So I feel like it's giving me some additional protection for the internals.

EODiver
January 14th, 2012, 12:09 PM
I reread your post and realized what you were asking... Yes, you can tune it to the higher IP, you can't tell the difference.

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