blending question

[jeepster0000]

Is it really necessary to analyze the He in a mix. I mean if you did your calculations right and your O2 comes out fine, is there a need to analyze He. The reason I ask is because purchasing a He analyzer is very expensive. I am thinking about making one, but the output from the sensor is not liiear.

I just mixed up some normoxic mix. I analyzed the O2 and I was .8% off. I figured if i was .8% off my mark, I would be okay to dive the mix. My END is 100ft so even if I have less He than plan my END could not go more than 120ft. If I have more He, then there is no problem.

Let me know.
ADAM

 

[MikeFerrara]

I like many do not have an He analyzer and I get by. The O2 content is the most important since a mistake there can be very unforgiving. I wouldn't think anything at all of diving a mix with the O2 within a percent of target especially if it's on the low side.

 

[Scuba_Vixen]

run the numbers on your planning software for 10% over and 10%under the intended He percentage. If there's enough difference to to consider, go with the more conservative times.

Mix isn't known for being forgiving, best to be safe


Darlene

 

[BigJetDriver]

MikeFerrara once bubbled...
I like many do not have an He analyzer and I get by. The O2 content is the most important since a mistake there can be very unforgiving. I wouldn't think anything at all of diving a mix with the O2 within a percent of target especially if it's on the low side.

Good point, Mike! There is SOME flexibility, but as you say, not a heck of a lot. I finally got an Atomox to use alongside my OxyCheq O2 meter, and boy-oh-boy does it make life easier!