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At 12.43 95-09-27, William E. Sadler wrote:
>
>> Have you run any head to head comparisons between the two types? - Tony
>Not personally.  But I have spec sheets from both sensor types, and the
>electrochemical ones are not ones that I'd choose for a life critical
>application.
>
>They don't even have repeatability within 1%, its +/- 2% for the sensors that
>come with the mini-ox units.  The electrochemical sensors with repeatability
>of +/- 0.25% cost almost $400 a unit.  The paramagnetic units are repeatable
>to +/1 0.1%, accurate to within 0.25% full scale, and linear from 0-100% O2,
>have neglegible histeresis (sp?), and never have to be replaced.  (Calibrated
>once every 5 years or so).
>

Have anyone seen the new? Draeger sensor. It is supposed to be a twin cell with
built in redundancy, when the two parts give different readings the instrument
warns you. However my guess is that this unit has the same drawbacks as other
electrochemical cells.

Have anyone though about lambda cells? They are used in car engines to measure
the FO2 in the exhaust to optimise the mix for the catalythic converter.

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