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Matt, it occurred to me that another way to see if the flow was affecting the reading is to shut off the flow and see if the numbers change. If they don't change for 2-3 seconds, then the pressure is not having an effect on the sensor. So far it looks like at pressures of 2-4 lpm or thereabouts there is no difference due to pressure. However, I was told that as sensors age this may no longer be true, I don't know. I've gotten the unit to work properly, even though I'd still like a flow meter that has the correct range. At least I have something to measure my mixes now. I'm not sure what the advantage of the plastic bag would be...but it would be nice to get one of those squeeze bulbs for calibrating the analyzer. Cheers. Matthias Voss wrote: ~ >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. -- Paul B. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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