Quote: (Originally Posted by
dave t)
Ok thanks for the explanation but all that does is show you are good at maths
A cells output is in milivolts, the computer or controller converts it to a po2 reading, so if you take a reading and youir maths dont add up how do you know where the error is? is it the A-D converter or is the o2 content not what you think it is!
sorry but in realtime I cant see any value in that, and anyway what we should be worrying about is current limiting, a much more hazardous situation in my humble opinion.
best
Dave
The value of mV readings is when you are prepping/checking/calibrating your cells with the unit on the bench. AFAIC, there is no value in real time, and never said there was.
Two point calibrations mitigate cell non-linearity somewhat, but by checking the mV readings (at surface), you can get an indication of impending non-linearity (the main cell failure mode), before going in the water.
If the cell mV responds as expected at the surface, it thus worthwhile to go in the water and check them there (using PO2). If this all checks then your ok to go.