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| Originally Posted by MATTBIN CCR - how do you work it out given that the pp02 stays constant at whatever the set point is, in theory anyway. |
In essence you use constant ppO2 tables rather than constant FO2 tables.
Most of your deco software will cut them (click the CCR box) and I printed a set of DDplan tables for my favourite mix and laminated them and stuff them in a pocket for the dreadful day when the computer packs up and my buddy is on a very different mix.
Deco software resolves the fractions of inert gases into partial pressures to do it's sums anyway so we are actually making things easier. I don't use a loop sensor on a VR3 as I prefer it to run on what I tell it I'm using and get the three cells voting rather than base everything on one other cell that might just want to go do its own thing for the afternoon.
Before I had the VR3 I set the Aladin Pro Nitrox to whatever my 1.3bar ppO2 worked out as at the bottom and took a slight penalty on deco stops where it though I was on a much weaker mix. However overstaying a stop on CCR is boring but doesn't burn significant extra gas.
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I doubt very much I'll go CCR I'd like to know none the less?
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Questions are the first symptom, then denial. You will be assimilated in time. Don't worry.