Quote: (Originally Posted by
doug allen)
From my experience, the sensors will fail in one's or two's
you have been diving rebreathers since 2007?
Quote:
I suppose it is possible for two to fail "during" a dive, but I'd think that would be unlikely....the ones that have failed on me were fine the day of the dive, but failed the next am....and/or prior to the next dive...either one or two at a time....and who would dive with one or two failures prior to a dive?
O2 tox could be a culprit, but, as I've seen thus far....most ccr dive accidents lean towards diver error and not equipment failure.
Ive had 2 cells fail during a dive, Ive had (and a buddy has had) 3 cells fail during a dive (the later had a tox) in both cases cells were new
The point is cells have a known history of BATCH failures so we should never use all 3 cells from same batch - as they
could all fail (dropping output) at similar rates and time and the user wouldnt know (see 2 instances above) Cells fail as they age but you are far
less likely to get cells failing at same time if you stagger their replacement
why take the risk? Id rather have 2 from one mnf and one from another come to that.
Did you know that one way cells can fail is if the temp compensation isnt linear. That can be a batch fault and theres no way to detect it pre dive OR post dive cells look and behave fine, as the fault manifests itself only as loop warms up. User will never know unless he dil flushes during the dive. (see case above)
I bought 3 AI cells - they all failed after about 6 hours in water. They sent me 3 replacements. I fitted one of the replacements in my BOB and it just failed a few hours into my 1st dive on it.