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Bruce - you can analyze for helium: put in the helium and oxygen, then analyze that for oxygen. You then know for sure what your helium is . Now add the air and analyze for oxygen again. Now you can calculate the helium percent exactly. The problem is that those who teach this stuff are absolute morons, or would have explained that to you a long time ago. THIS is another thing that is wrong in tech diving today. C. Bruce Jones wrote: > > Hi George, > > At the risk of throwing another log on the deep air fire, I have a question. > Each time I get a EANx fill, whether it be 32, 36, or the dreaded 80, I > sign a log which says that I have tested the mix and I write down the test > percentage along with a C-card #. As nearly as I can recall, I have never > been asked to analyze a trimix fill...but I do anyway (BTW ... wisely > suggested by my trimix instructor). While we cannot test the He %, the O2 > % should indicate whether the right mix has been achieved. > > Could it be that the missing WPB divers had the wrong mix which may have > been a contributing factor to the accident? Do we know which gases they > were carrying ( probably too early to tell)? Sadly, we may never know the > real cause unless their gear is recovered...and maybe not then, if > cylinders are empty. > > Bruce Jones -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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