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..really good question, my first comment at the "round table" after the first dive. we were told to purge the bag twice before assent to avoid low levels of o2 near the surface.. another worry for me related to the same "missing necessity".... some sort of indicator. there are acutally two ways the gas gets into the breathing loop thru the 2nd stage, the down streamvavle for compensating on decents, and the constant flow oriface (which is a ruby with a hole drilled with a lazer for accuracy), this part (the orifice) has no working parts to malfuntion (except the first stage 220psi intermidate), i guess it could get clogged with out proper maintenance... (btw, the germans call the first stage a "reducer"). STILL, i agree with devon, totally, and suggested that drager at least incorporate a ppo2 meter.. this could be ran off the o2 sensor with no battery necessary... basically no electronics... aloha, dennis On Tue, 18 Jul 1995 devon@ol*.ch* wrote: > Do these constant flow systems worry anyone else? I saw the Draeger unit > in the UK a few months ago and the first thing that hit me was that you > rely entirely on the reg that's feeding the bag with new O2. Ok, so that > isn't such a big deal. When it breaks you can switch over to a back-up > reg, right? But how do you know when it breaks? It just stops feeding gas > and the O2 in your bag gets lower and lower. Without a computer to monitor > this, you might not know that your O2 stops until it's too late. That's > one nasty (largely undetectable) single point of failure. Do others have > comments on this? > > Devon > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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