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Just caught a thread on cell life. As people have correctly pointed
out the micro-fuel cell oxygen sensor produces a voltage as a
product of a chemical reaction which is oxygen dependant.
It should therefore follow that if you eliminate the oxygen from
the gas the cell is in it will extend it's life. We messed around with
various seal-top bags and boxes and caps - you name it - we tried it!
We don't bother now. The main supplier of analisers in the UK use
Telydyne cells. We have used one of their long life cells for about 12 months
now. The life is 4 years in air (sorry Eanx 21!). With this kind of longevity
it is (to our mind anyway) not worth the hassle of helium filled bags etc. We
prefer to change the cells after a couple of years for that extra piece of mind.
They also supply a small gizmo for checking the electronic calibration
independant
of the cell. What it basically does is 'instruct' the electronics what it
should be
measuring when the cell is in 21% O2 + 100% O2 - pretty useful if you have a
cell
that may be coming to the end of it's useful life and has a falling output.
Regards
Chris
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Chris Hellas EMail:- chris@de*.de*.co*.uk*
10422,2334@co*.co*
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