Rebreather that uses standard air?

wetwilly

Are there any rebreather systems that operate off of a standard tank of air rather than Nitrox, Heliox etc.? Hoe do these work to be efficient and control the ppo2 levels? Thanks for your help!

wedivebc

Any CCR can use air diluent. Nitrox is frequently used in SCR and air can be used in SCR units but should not be used in shallow water so you won't find it in a single gas rebreather. The Azimuth and other SCRs with gas switching abilities can use air for the deeper parts of the dive.

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Cheers,

Dave....

Man is the only animal burdened with the knowledge he will eventually die

RonMicjan

the problem is there is not much oxygen in air, and as soon as you start RE-breathing it, the O2 content falls to a hypoxic mix and soon after you pass out. At depth, air will last a few more minutes due to the density providing more O2 molecules to breathe, but the O2 will need to be replenished some way, either by injection (CCR) or constant flow of a nitrox mix (SCR).

You may want to read a couple articles and get a better idea of how a rebreather works so you may better comprehend why all this work as it does.

http://www.rebreatherworld.com/gener...-need-one.html

http://www.rebreatherworld.com/gener...ghtenment.html

try these two and as much as you can read in the new to Rebreather library

you are on a distinguished path grasshopper : )

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Mark Chase

On a CCR, what ever diluient you use, be it Air or Heleox (Or even pure Helium but that wouldent be very clever) needs a bottle of pure 02 or near pure 02 straped on the other side to make it work. The 02 has to be replaced as your body uses it up.

ATB

Mark Chase

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Is it supposed to make that noise ?

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gathan

Actually Mark,

Pure helium is used as a diluent on the Canadian CUMA rebreather (also see Carleton Viper) and it is a pretty cool unit . Mind you this particular Rebreather functions quite differently than your typical CCR/SCR. We've done some experimental dives using N2He mixtures as diluent last year and hope to do some more in the near future.

Andre

wetwilly

Thanks for the clarification. I did observe that oxygen consumption would decrease the ppo2 level at lower pressures but was not sure if someone addressed a means of using air instead of a specialty gas.

tflaris

The AP Evolution uses air as a diluent in one tank along with another tank with 100 percent O2. This unit is an eletronically controlled (or manual if you desire) that operates a solenoid that injects small amounts of O2 as needed to maintain the setpoint. The setpoint is iniatially set by the user before the start of the dive or change be changed during the dive. There are 2 setpoints a low and high setpoint and a depth that the unit will switch automatically or manaully if desired between. There are no sensors other than the diver monitoring the setpoint to prevent exceeding the setpoint and the breathing loop becoming hyperoxia. Hope this helps.

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"Except for this one, I have come to the conclusion that all generalizations are false" -Jim Hayes