scowens
Contributor
Anyone know the formula for how much O2 to add to a tank to get to the desired Nitrox content? Maybe, I'm just dain bread this morning from too much turkey:11:
Thanks
Steve
Thanks
Steve
Mix Question
- Thread starter scowens
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The Chairman
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Try Freebie Blender Program.
Other than that, I use a fairly unsophisticated method of estimating, calculating, re-estimating, re-calculating until I get within 1%. I discount Van der Walls forces as the gauges used in most shop are not accurate enough to worry over.
Other than that, I use a fairly unsophisticated method of estimating, calculating, re-estimating, re-calculating until I get within 1%. I discount Van der Walls forces as the gauges used in most shop are not accurate enough to worry over.
I use Nitrox Basic V. 1.3 on my PDA. It's freeware and simple to use as you just enter starting pressure and PO2 and the target pressure and desired PO2 and it will give the amount of 02 and air to add in PSI or BAR.
Using an accurate gauge on the 02, I have never had a problem getting within 1% on the first try as long as fill rates are kept suitably low.
The only significant limitation I have found is that you are limited to target pressures of 2250, 3000, 3300 and 3500 psi so some extrapolation is needed for 2400, 2475 and 2640 psi fills if you are an LP steel tank user.
The advantage of using a PDA based program is that it will always be around when you need it. And if you invest in an older tech monochrome PDA, a new PDA like a Palm 500 will cost you around $50.00 on e-bay, so it will not break your heart or bank account if it falls overboard.
Using an accurate gauge on the 02, I have never had a problem getting within 1% on the first try as long as fill rates are kept suitably low.
The only significant limitation I have found is that you are limited to target pressures of 2250, 3000, 3300 and 3500 psi so some extrapolation is needed for 2400, 2475 and 2640 psi fills if you are an LP steel tank user.
The advantage of using a PDA based program is that it will always be around when you need it. And if you invest in an older tech monochrome PDA, a new PDA like a Palm 500 will cost you around $50.00 on e-bay, so it will not break your heart or bank account if it falls overboard.
I wrote an Excel-based gas blending program for starting with any mix of air, Oxygen, and Helium and ending up with a desired pressure and mix. Send me a PM with your e-mail and I'll send it to you (don't know how to post it to the board).
scowens:
You will find the formula in the Gas Blending Text that came with your Nitrox Gas Blenders Certification course.
Andreas Hagberg wrote a nice little piece of freeware called the Gas Management Program (GMP). Downlaod it at: http://www.gmp.tech.nu/
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