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--has anyone come across problems using galvanic sensors in a helium 
environment?
the reason i ask is because on a spec sheet for some cells that i saw that 
mentions the problem of graham's law. this is to do with the rate of diffusion 
of oxygen into the cell with different carrier gases than the intended
nitrogen. 
(these cells are intended for environmental monitoring up to 25% o2 but seem to 
function in the same way as for example teledyne cells).
As an example, if the carrier gas was 60% o2 and 40% n2(might be the other way 
round, the spec sheet is not to hand) then the output is 1.23 times higher .

I have done some tests today on a teledyne cell and there does not seem to be a 
problem with them.(checked against a Servomex Paramagnetic analyser).

Any ideas?

Julian Bottomer

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