Quote: (Originally Posted by
webhead)
I can confirm that on the Apec 1 and the ISC/Shearwater heads, there are power switches on the head that end up inside the canister body when assembled for diving. The A1 has a timeout that turns off the display (still fires the solenoid) and the ISC/SW can be turned off from the handset in software (display and solenoid off). Both will turn on in the water - A1 has pressure sensor (actually displays depth and dive time) and the ISC/SW has a wet switch.
So if you do a proper pre-breath, unless you open the unit or the batteries die, the unit will self activate when you start the dive.
Thanks for the info...
It would seem that the Inspiration and Evolution then are in the minority of production eCCRs (don't know about the Prism) in that if you jump in with handsets off they will not come back on again due to a pressure / water switch.
Given that there must be power running to the handsets to allow the "soft" switches to work I wonder why APD went down and have subsequently stayed on this path?
I personally would prefer to see the handset switching on automatically... and other than maybe it burning through batteries faster is there any other reason why they might not have provided this function?
Steve