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How do you know it's air?
Originally Posted by Jim Wyatt
I've wanted to do the same thing. Actually, I want one with air and one with 100% O2 since analyzers should actually be calibrated at the low end and at the high end. Problem is I haven't gone by any shop that doesn't fill anything but air. And I won't trust a calibration tank to be filled at a shop that fills both, especially when they use the same whips and just bleed them down to switch between air and nitrox.
I just remembered a time when I borrowed a couple of tanks that the last time they went out were filled with trimix. No one had bled them out, so I got topped off mix. Fortunately, since I dive mix, my analyzer also analyzes for helium. Also fortunate was the last person to dive those tanks was a hoover so the helium content wasn't that high (I didn't analyze until I was at the dive site...d'oh). There was no problem adjusted my deco for the mix. That taught me to analyze borrowed tanks before getting them filled, though. And to not rely on an O2 only sensor at shops where you can get trimix. It makes me wonder how many people have done trimix dive inadvertantly...
Originally Posted by saturation
Our shop ran a trip to the panhandle several years ago and I blended eight AL80s of 32%. The next week the shop owner berated me for mixing high, something like 33.5% consistently.
I asked what they calibrated the analyzer to, and he said, "20.9, of course."
At 90° and 80% relative humidity, the analyzer should be calibrated to 20.1%. That's why they got high readings.
In my trailer I have a digital temperature/humidity meter on the wall. I don't think I've ever calibrated to higher than 20.7% outdoors.
Whoever said money can't buy love never bought a puppy.
Ginnie : )
Originally Posted by RN
ah ha, the olde scuba tank, what a novel idea. why didnt I think of that. calibrating your analizer from of all things..a scuba tank. brilliant.
Last edited by Slüdge; 05-14-2008 at 03:53 PM.