Analyzing Nitrox..Do You

[terrasmak]

Folks,

You had better be certain that you know what the mix is, or you may find yourself "doing the chicken dance" (technical term) at depth! :11:

Exactly , i always check for myself too , doing the "kickin chicken" is not very high on my to do list

 

[Scubar]

Where I get my nitrox filled they do not even indicate the %EAN until analyse you own tank at the shop. They verify the %EAN and fill out the EAN sticker % and MOD. You also sign for you nitrox and show cert before you leave.

 

[my1ocean]

Every time. No exceptions. I take no ones word for an analysis.

As posted above, the shop I work at requires divers to watch calibration, analyze their tanks, sign a log at the shop, and fill out (and initial) a sticker on the tank. It avoids any confusion.

Even nitrox fills have to analyze and sign the shops log.

 

[Notso_Ken]

The heat / cold and the movement of the tanks can change the mix.

The ONLY way the mix can change is if new air/O2/N2 or something ENTERS or LEAVES the tank. Heat, cold and movement do NOT change the mix, however, they may help mix it up better.

Ken

 

[ScubaCo]

Always be there and see the testing of the gas when you don't have your own analyzer. First test the analyzer on air 21% and then test the Nitrox!
Analyzers are expensive, but can save your life..

 

[Bob_B]

The ONLY way the mix can change is if new air/O2/N2 or something ENTERS or LEAVES the tank. Heat, cold and movement do NOT change the mix, however, they may help mix it up better.

Ken

That is true but I have had the mix "move" as much a 1% after riding in the truck for a few hours. I guess the mixing is the factor? or the the way the doubles are filled? Either way I always recheck both tanks after a long ride or after setting a day or 2.

 

[neil]

That is true but I have had the mix "move" as much a 1% after riding in the truck for a few hours. I guess the mixing is the factor? or the the way the doubles are filled? Either way I always recheck both tanks after a long ride or after setting a day or 2.

The mix didn't change. It was some combination of testing technique and some inherent variation of the analyser/environment that caused the different reading. Testing a nitrox mix with the gear we have out in the open isn't exactly NASA lab conditions, which is probably what you'd need to get EXACTLY the same results each time.

 

[DeputyDan]

I have never done a nitrox dive (except 21%) and not rechecked the mix.

 

[H2Andy]

I have never done a nitrox dive (except 21%) and not rechecked the mix.

here's a question (and i had thought of it before, Dan... not picking on you =)


why not check 21%? what if someone screwed up and gave you 36% Nitrox instead???

wouldn't it make sense to sample every tank you use?

 

[WyCal]

In God we trust, everything else we check.