Shopper To calibrate this unit, do you need a tank of regular air or does it just use atmospheric air?
JAMES S Atmospheric air...adjust according to humidity unit comes with a chart
WILLIAM H I always use compressed air from a tank to calibrate the anlayzer prior to measuring the nitrox mix. You need to purge the passage fully to get an accurate reading.
I also recommend buying the option plug to seal off the sensor when not in use. This will greatly extend the life of the sensor element which is expensive to replace.
I hope this helps!
DALELYNN S As is indicated in the documentation and the little chart that comes with it you can use ambient air. That said if the relative humidity and temperature are high you need to compensate for the difference. A difference that can push the reading to another percentage level, therefore an important step. As compressed SCUBA air from a good shop is dry it suggest that if the relative humidity and temperature are high then use the dry scuba air to help mitigate errors
LISA S All you need to calibrate is regular atmospheric air. Don't need a tank. Hope this helps!
PAVEL M just the air
there is a spheric cap on oxygen sensor,do not remove when testing,
just stick it into valve and open valve barely.
unit stays on for 80 sec.,then shuts off automaticly.
O2 sensor will last about 3 y., $100 @ L-pro
9v battery lasts about 1 y.
over all very good analyzer
MARC M It is ideal to use a tank of air, but you can use ambient air as well. On trips that I have been on, often there is a tank of air in the nitrox station for you to use to calibarate. The manual says that you can use either a known air source or ambient air. There is slight variablity in more humid air, but not so much that your mix will be skewed.
SUSAN S I always use a tank of air to calibrate this unit. It comes with a chart to calibrate without an air tank however, you have to know the air temperature and the humidity. I find if you you use the tank of air to calibrate each time, you get very accurate readings with this unit. I take this with me around the world.
PAUL B Atmospheric air. You also need to know the relative humidity, but that's not as critical. The unit will stabilize within a few seconds, and you adjust the tenth of a percent with the calibration wheel on the side, next to the display.
It works well. The blends I've tested were accurate, and therefore my dive computer settings were accurate.