As an o2 sensor ages it looses capacity or its ability to achieve peak output.Got a somewhat related question for those using their own analyzer. Since O2 sensors eventually need replacing, what happens to cue you in on that? Is it age, # of tanks analyzed, does the analyzer display an alert, or do you get suspicious when the reading is much different from what the tank is supposed to be, so you check against another analyzer?
Richard.
All an analyzer dose is express the sensors milivolt output as a percentage.
Let's say 54 mv is represents 100 percent o2 and 0 mv = 0 percent o2. Plus or minus 10 mv that's why we have to calibrate.
As the sensor ages its ability to read in air is not affected but its ability to reach to max mv or 100 percent will be apparent.
Only way to validate the proper function of an analyzer is 2 point calabration.
This means calabrating in air then checking against a known 100 percent source. You may also have to factor in altitude and some analyzers come with an altitude calibration chart . If the analyzer cant achieve 100 percent or the factored value then the sensor is current limited and needs to be replaced.
Any one diving nitrox should have their own analyzer. Any shop providing nitrox should be asking all coustomers to analyze and sign an fill log prior to the dive.