Quote:
| Originally Posted by [b Quote[/b] ]It doesn't matter. you can analyse any helium/air mix and do anything you want afterwards to it and still get an accurate mix with an O2 analyser. It is a fixed relationship rather than trimix where you are introducing a third variable. |
That much is obvious - just wondering what your typical startoff heliar mix is. I'm thinking it'd have to be a pretty strong (& hypoxic) mix to make it worth doing an air top the second time round and still get the benefit of a bit of He. Presumably for two deeper dives in a row you'd do a fresh mix for each one? Or put a squirt of He in the depleted original heliar & top with air?