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Originally Posted by MaxxxRacer
I am looking into building a test rig for WB reviews and I was wondering of the accuracy I could get with a pressure gauge that would measure from 0 to 7 psi.. This is about the range that we see in WC loops. 10PSI is for md30 and above.
So my question is will the psi rating work correctly with the corelation to the pq curve of the pump so that I can get flow ratings. Or is there another factor that I am not accounting for with this idea.
Any input would be great.
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Depends.
For a start it would have to be a differential pressure gauge, ie you are measuring inlet to outlet.
Secondly how are you planning to adjust the flow? If it is with a valve this might work but if you adjust the pump speed the curve is different. I don't think it will be very accurate but is maybe worth trying.
A better way would be to measure pressure drop across a known restriction. This is how many flowmeters work. The problem is that the restriction itself might be undesirable. If it is low the pressure drop will be very small and you will need a much more sensitive pressure gauge, e.g. 1psi FS. If it was high enough to measure accurately with a 7psi FS pressure gauge the restriction would be massive.
I am thinking a lot about this myself. Been considering doing just this actually but I don't like the restriction problem.