Quote: (Originally Posted by
najones)
Davichin: You are correct. Dive equipment do not use depth sensors per se. They use absolute pressure sensors from which depth is inferred.
...and adding to that: for the deco-calculation-part of the electronics, it also doesn't matter, as those are also based on absolute pressures, not on meters of depth. So they'll adopt automatically to the 4% difference between salt and fresh water.
So the only thing off is your depth indicator, e.g. if you want to use it for your tables in case of a.o. OC bailout. Most manufacturers though will calibrate in the factory for fresh water, so that it indicates a slightly bigger depth than is actual while diving salt. This only adds to safety while using tables.
Most CCR's I've seen around lately do not cater anymore for a salt/fresh setting for this reason.
Ciao,
Tino.