Mailing List Archive Mailing List Archive
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.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]