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Scott, In regards to your suggestions that would possibly take care of hypoxia but what of hyperoxia concerns with the unit? Dave >At 10:33 AM 7/18/95, Dennis Pierce wrote: >>..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... > >I think a simpler mechanism would be a mechanical flow sensor that just >closed an electrical connection when gas stoped flowing from the reducer. >There's no reason to add a consumable O2 sensor to the rig unless you >want to monitor partial pressure. If all you want to protect against >is injection failure, all you need to know is that gas is flowing from >the O2 bottle into the bag. > >Scott. > > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'.
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