Question NITROX (in less than 40 foot of water)

[EFX]

Exactly, you are trusting the design and calibration of the analyzer, you are trusting your instruction on how to use it, etc.

If you didn't design the analyzer yourself, how do you know that it really does what it claims? /s

Compare it to another analyzer known to be accurate.

 

[CT-Rich]

Compare it to another analyzer known to be accurate.

If you MUST compare it too another sensor to believe it is correct, I would recommend owning three. If you have two and one is off, you have no definitive way of saying which one is correct. That way, you can pull out your trusty THIRD analyzer and declare definitively which one is correct.... all for the low, low price of $900.

Or.... you could compare it to a known reference sample with each use. Coincidentally, Air is pretty reliably 21% Oxygen pretty much everywhere... if you can't get it to calibrate against that.... you need a new sensor.

 

[J-Vo]

To truly no if your sensor has failed it has to test in air and O2. Mine get tossed when they won't read > 98.9% after calibrating in air. If they go up to 99% they are inside of 1% accuracy.

Just calibrating to air gives you no idea if the cell is current limited @ 30/40/50/>100%.