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-- [ From: Mike Sandler * EMC.Ver #2.5.02 ] -- Just looking for an opinion or two (not neccessarily analytical, or quotes from CGA standards) just a general 'whats your feeling'. It would seem to me that a 2% discrepency in a nitrox mix is virtually irrelevant for practical intents and purposes. Considering the shallow depths nitrox dives are conducted and the variances between individuals with respect to their individual tolerances to increased O2 partial pressures, I personally won't worry about it. For example, If I take a nitrox tank ( i know the gases have diffused very quickly and my mixture is homogeneous ) get a reading of "somewhere" between 30% and 35% O2 and... heck I'm going diving. My max depth will be consistant with the "standard" EANx mixtures, but I won't be splitting hairs (read counting exact fsw). I will perform my usual conservative deco, but again not counting the seconds with respect to any one given gas mixture. I do recognize that 2% becomes important on say a trimix or heliox dive to 400 fsw or maybe even when the nitrox is used as a deco gas after a long and deep exposures at increased ppO2's, but thats not the type of diving I understand from reading this thread. mike -------- REPLY, Original message follows -------- <snip> From filling a lot of nitrox tanks, I am also inclined to believe that partial pressure mixing does not produce an instantaneous homogenous mix. I have found you can get a change of up to about 2% if you test a cylinder straight off the whip to a few hours later. <snip> -------- REPLY, End of original message --------
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