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Paul,
you might want to try if you can verify -any- difference in measuring
you mix O2 when not using the flow meter, but a plastic bag instead.
Sqeeze it out , let the mix flush it sufficiently with the sensor
inside, and watch. 
This method was recommended to me as their own standard by a manufaturer
of medical analyses instruments. To the moment, I have yet to met
circumstances where this method fails.
-Matthias

Paul Braunbehrens schrieb:
> 
> I just got the OMS oxygen analyzer.  The flow meter was so filthy
> inside that I'd have to crank the gas to get it moving and then go
> back down.  In addition, the flow meter is a 15 lpm type, which means
> that calibrating for 2 lpm you need to use the very first line on the
> flowmeter, the very bottom of the range.  It's hard to tell if you've
> got it or if the ball is still resting on the bottom stop.
> 
> I like these analyzers because I like seeing the flowrate (my
> paranoia I guess).  But I'm really sick of dealing with OMS.  The
> last time I bought something from them it was missing a couple of
> parts...good thing I checked it before jumping in the water.
--
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