Quote: (Originally Posted by
jmurba)
hem....
why a big nitrox bank ?
I only usualy blend 200 litres of trimix .
as for the air contamination as a matter of fact I think I will have to pay attention to this...it is maybye worth to install an o2 analyzer in the expansion bag on on the hose going from the bag to the intake of the stick...well I see thing clearer now tanks of all replies...
regards
jean mi
I replied a bit too quickly (on company time). What I mean is that if you are topping up Rebreather tanks with only Helium, and/or a certain nitrox (that never changes as a result of topping up/remixing the nitrox only storage tank). You can always determine your He and N2 concentration by measuring only the O2. You would need a special reference table (the one above is valid for Heliair only).
In order for this to work, you have to be very strict about always having the same Nitrox.
If you are ok with hypoxic Heliair mixes (as I am), it is more practical. Providing your compressor is sucking clean air, it'll always be 20.9%.
G