I guess this doesn't make sense to me.  If gas is flowing, how can 
the pressure be ambient?  What is the error induced by having a 
higher PP due to a flow over the element versus a resing pressure. 
It seems to me that if the flow is off by 10% you'd get a 10% reading 
error, although in practice this doesn't seem to bear out.  Sorry if 
these are stupid questions, but I'd rather ask some of those than tox 
on o2.

Thanks.

Chris Elmore wrote:
~
>Paul,
>      For flow rate, get a needle valve from the brass fittings 
>section at Lowes and use a flow meter to calibrate it. Once it's 
>calibrated epoxy the adjustment shaft and you're set to go- total 
>cost: about $5. You can even oxygen clean it if that makes you 
>happy. Flow rate doesn't really matter as long as you have enough to 
>purge the lines and move the gas over the sensor but not enough to 
>produce back pressure. Sensors measure partial pressure so you have 
>to keep the pressure at ambient. If you can hear gas flowing that's 
>enough.
>C.
-- 
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