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>Michel Therrien writes: >>Mike Cochran <mcochran@ne*.co*> writes: >>As background information, the NEMESIS II Nitrox will perform a blend >>switch (patent pending) if the Breathing Parameter (SAC) goes to zero. >>Since the computer does not actually "know" when a switch occurs, it >>monitors the primary cylinder and assumes the diver has switched to blend >>two when it is detected that breathing has stopped on that cylinder. > > >Does this mean that: > >If I'm deep in a cave, let's say 3000 feet from the exit, swimming (so, >quite a bit of time from the exit), if I have an equipment malfunction that >forces me to take my buddy's long hose regulator (either from his mouth, >under his chin or from his back pocket;), the Nemesis II will just assume >that I'm coming back on my deco mix instead of on my bottom mix (EAN 34 for >example)? If this is the case, it does not sound like a safe ride for me... I had this happen to me last December, and yes it is true. I had a valve down on my primary reg at 80 feet while begining decompression at the end of a 60 minute dive. When my reg started to shut down I grabbed one of my partner's backups (air) and we began our ascent. My computer switched to 100% O2 decompression and I didn't notice until we hit our 30' stop (which is when I got my valve turned back on and switched to my own main supply). At 20' I went on O2, but the computer had already cleared me for a direct ascent. >Isn't that possible just to put a manual switch on a dive computer for that >purpose? I wouldn't bother. I think it's a darned good reason to plan and execute your dive on tables. I use my computer as a backup in emergencies (i.e. unplanned excursions beyond the calculated decompression profiles). BTW, I have several dives on this machine and like it *very* much. I would no longer consider making a technical dive without it. Regards, Scott.
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