Posted by AADIVER on March 21, 2001 at 22:39:59:

In Reply to: Re: tri mix cert. posted by MHK on March 21, 2001 at 15:37:14:

Remember, Mike, I'm basically a formula and mathematical idiot, and of course topping off a trimix tank(s) with air after a trimix fill won't result in exactly 79% nitrogen, somewhat less. But how much less? What table(s) are used? Is there such a thing as a trimix computer? What percent He is ideal for a max depth of 100 fsw and how do you stay within NDL at various depths with such a mix? And when you finish the first dive and have, say, 1100 psi tri left and fill back up to 3000 with air what calculations and/or table do you use to figure NDL depth and time for subsequent dives? Or can these questions only be answered by taking a trimix course?