Quote: (Originally Posted by
ScubaDadMiami)
Interesting! Do you notice that the cells seem to stay much closer in range to each other when you do this (meaning the high and low are pretty close throughout even longer dives)?
I'm unsure what you mean.
Do you mean the dynamic range of each cell, or the difference between the cells? If you mean the former, no.
When disparity between cells occurs (usually after some 10-20 hrs on a single calibration), then it is time to post-dive (i.e. wet) calibrate.
Cells on a wet calibration will have a high bias when dry (i.e. ~0.24 in Air, ~1.05 in O2, and ~1.7 in O2 @6m), resulting in a marginal risk of DCS. I consider this risk a good price to pay for greater confidence against ox-tox.
The ideal (I believe) would be to have occasional pressurized cell checks on the bench (to about 2 ATA), calibrated wet.