Addition of O2

All constant mass flow mCCRs (rEvo, KISS, COPIS Meg, etc.) work under the same principle, the O2 flow rate from the orifice depends on the IP pressure of the Ambient Pressure Regulator, higher IP = higher O2 flow.

Your metabolic O2 demand while diving a specific unit is determined by breathing on that unit at rest on the surface and watching what happens to the pO2. Once you have matched the flow rate to your metabolic O2 demand on that unit the need to add O2 is constant regardless if you are using a rEvo, KISS, COPIS, or any other mCCR.

For example if you have a unit with a low work of breathing and you set the O2 flow rate to .78 l/min and then were on a unit that had a higher WOB you might need to set the O2 flow rate to .82 l/min because the increased WOB will cause you to use more O2 at rest due to the higher level of exertion during respiration at rest.

Hope that clarifies things.
Rob

Indeed it cleared things up, thank you Rob

Can't wait to get back to a "real" job and earn "real" money so i can buy a rebreather, X1, stages and and...

As I student you have lots of free time, but no money to spend during all the free-time.

As a pay-slave, you have a lot more money, but no time to use it in :-(

Nicolai

Never, the Hammerhead does the injection for me.

*GASP* You don't even verify what the Hammer is doing


If i can afford it i would like to buy the rEvo with the Hammerhead as well, run it as a backup if i should forget to add gas myself.
But hey, i might change my mind

More like rEvo changed it's mind.... the HH and Shearwater controllers were tested and the Shearwater was selected as the control system for the rEvo. The Shearwater/rEvo is the factory option.

Back to your question: If you have 'x' flow rate of 02 into a mCCR then you will have "y" additions needed to maintain PP02 at "z" workrate. None of it is rig dependant.

I have perhaps... depending on what's put together on any one day... half dozen mCCR's here. They all act the same way. rEvo, Kiss, modified LAR-V, Modified IDA-71, Modified P-96, etc.... the chassis is irrelevent. None are hard to use and 02 injections take place less frequently than PP02 checks, and that's all that really counts.

Do you have any idea who Dave T is?

I use an orifice and fixed IP. I have set the unit for my at rest VO2. There are dives which I never have to touch it. (I do check it on a regular basis)
Mine is set to 0,9 lpm. I never change the drive IP unless I dive warm water. It doesn't happen around here.
Everyone's base VO2 is different. You have to know yours. Then, depending on on which school you belong the flow is set to that rate or slightly lower. Lower requires you to monitor PO2 more religiously.
Dale