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Chris P.,
You seem to be making a bigger deal out of mixing gas than it needs
to be. You can do all the research, crunching data, talk to all the
math whiz kids you want, when the mixing is being done by the average
or non-average diver you cannot count for differences in everyones
gauges, eye-balling the needle, filling at different rates, or even
the true contents in the average fill of O2 or He you get from the
local gas supplier. All the mixer really needs to know is the normal
gas laws we've used for years. They just need to make sure the O2% is
not more than they wanted, it will not make much differencon deco if
the O2% is 2% low, check a few tables. When I mix 14/45 for Wakulla I
need 1620 He and about 140 O2. I will overfill the He to 1700 or 1750
cause I don't want to be narced, which causes the final O2% to be
between 13 and 13.5%, I also don't want to tox. I don't know how much
mixing you do, but I go through about 1500 cubic feet of He a month
alone. I'm sure all the other guys here on WKPP would tell you the
same thing. Try the Hogarth approch to gas mixing, KEEP IT SIMPLE.
Barry
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