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Capt. Jim Mims <divetek@ic*.ne*> wrote: > ... it will display the = >partial pressure equivalent of air at a given altitude. i.e.: >On a flight I made to Houston from Ft. Lauderdale in a Cessna 210 = >averaging 19,000ft altitude my mini-ox read 12.0 in the cabin. When I = >used the sensor in my O2 mask to confirm a sufficient supply of = >supplemental O2 was present it read 64.4. ... Okay, so this establishes that if you take an analyzer calibrated for sea level up to 19,000 feet, that affects your readings. It's showing you the ppO2 at the sensor rather than the FO2. However, if a passenger on that aircraft recalibrated the meter to show 20.9% in ambient air and 100% on the aircraft's O2 supply, and if a bottle of nitrox was onboard (in probable violation of FAA regulations), they should then be able to correctly analyze it with normal ground-level procedures. Just make sure you hold a steady barometric altitude during the exercise and don't throw the readings off! This would also be why flow rate at the sensor is important anytime one does an analysis; creating an above-ambient pressure on the sensor by blowing too much gas onto it will proportionately throw off the reading. -- Anthony DeBoer http://www.onramp.ca/~adb/ adb@he*.re*.or* (here) adb@ge*.co* (work) #include "std.disclaimer" -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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