mempilot

I toss the cells when they are consistently slow during calibration. I also toss them when they won't go above 40 mV. This one cell listed above was reading just shy of 60 mV for 4 dives and then dropped to 38.x during the next calibration. I switched the cell around to make sure it wasn't a wire problem, and the cell read the same mV no matter which spot it was in.

Because of this cell behavior, I now calibrate at the beginning of every day (usually one to two dives in a day). I used to only calibrate once every few days of diving, but after seeing this cell go from strong to bad in one dive, I consider this an unneccessary risk. I'd rather not have to call too many dives or start peeling the head off the unit onboard a boat due to a bad cell noticed on the prebreathe sequence. I'd rather catch it in the calibration sequence. I know some are doing humid calibrations after a dive. I'm not sure I'd be comfortable with that either due to this reason. Granted, the cell will get voted out during a prebreath, but I'd rather know ahead of time.

__________________
Eric Stadtmueller, otherwise known as, MEM "Da Pilot"