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> 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. I was one of the first beta testers of Abyss. The only criticism I've had about his product (since the beginning) that Chris hasn't addressed already is the over-emphasis on precision for things where the accuracy is orders of magnitude lower resolution. Ask Chris about my "Titanium Doorstop" analogy, or my constant restating of one of my favorite quotes (from my wife): "It is better to be vaugely correct than precisely wrong." But in Chris's defense, the excessive precision doesn't hurt any as long as it is clear to all users that our chaotic bodies in no way approach this level of precision. (And I think Chris does a good job of that with his product). The over-emphasis on precision can be instructional to people, if for no other reason than to underscore that incredible complexity of the variables they play with on a day-to-day basis. Furthermore, when you have to make trimix or heliox other than the blends you've used many times before, it can help reduce the guesswork in the helium over-pressurization. Aloha, Rich
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