Thanks for you reply Andy,
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Andy: Hr, hrm. My Rebreather usually has three cells in it but they all get validated even when they all agree. The real question is why your new RAT does not have it if your BOB had it? Did you have any reason not to have it inthe RAT?
I built the BOB for one purpose (To do the deep cave Sra Keow - we had planned on max depth 280m) so was aware that flushing at depth to validate cells would quickly kill off my dil supply. It was a relaively untested bit of kit* I was using an unfamilar ppo2 display and an unfamilar (untested) VR3 display so wanted the option to validate at depth at intervals (assuming Id bailed to it) if displays started to show variance or not (10 hours is a long time to be breathing the wrong ppo2). On the RAT I am using familar componenst and well tested (plus not taking it to 280m) so just thought Id make do with normal dil flush method.
I think your idea makes good sense- I like the idea of using a tiny amount of dil to do a very quick validation with the press of a button. The faster, easier the validation and the less dil it uses - the more sense it makes..hmmm I feel a mod coming on. Of course this would only work easily on a mCCR - but I do like it.
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So, can we kiss and be freinds now?

did we stop being friends?
* Which is why I had full OC bail out as well .