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Heliar is DIW. There is only one depth that the heliar mix curve matches PPO2 and END, and it's not anywhere under 200fsw. Here is a mix chart for heliar for a 3000psi tank (I think) (ftp://ftp.nwls.com/pub/kevin/mixing.xls) He psi he% n2% o2% 100 3.3% 76.4% 20.3% 200 6.7% 73.7% 19.6% 300 10.0% 71.1% 18.9% 400 13.3% 68.5% 18.2% 500 16.7% 65.8% 17.5% 600 20.0% 63.2% 16.8% 700 23.3% 60.6% 16.1% 800 26.7% 57.9% 15.4% 900 30.0% 55.3% 14.7% 1000 33.3% 52.7% 14.0% 1100 36.7% 50.0% 13.3% 1200 40.0% 47.4% 12.6% 1300 43.3% 44.8% 11.9% 1400 46.7% 42.1% 11.2% 1500 50.0% 39.5% 10.5% as you can see, none of these mixes make any sense. For example, a mix for 200fsw would be something like 18/40, and you can't get the right combination here. You could dive 12/40, but that is a little low on the O2, and unnecessarily hypoxic. At 01:26 PM 12/30/1999 -0800, you wrote: >Team: > >I am told that many members create their own mixes using personal cascade >systems. > >Because heliair would probably be the easiest introduction to this method, and >also increase the safety of ones mix (only interested in < 200fsw at this >point), I was wondering if anyone would like to share their experiences in >this >area. Pros, cons, concerns, applicability, etc. > >Thanks, >Tod > > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. ---------------------------------- Kevin Connell <kevin@nw*.co*> NW Labor Systems, Inc http://www.nwls.com ---------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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