mass flow meter drifting from actual reading
mass flow meter drifting from actual reading
(OP)
Have you all met this problem of a coriolis mass flow meter shows that there is a flow of 300 liters per hour while there actually has no flow in the flow meter. Futhermore, the reading keeps increasing over the time and the trend of the flow increment is pretty steady.What reasons could possibly contribute to this? Is it because of external vibration? or air bubble inside the flow meter? Thanks.





RE: mass flow meter drifting from actual reading
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: mass flow meter drifting from actual reading
The scale is 0 ~ 16000 liter per hour, with an accuracy of plus minus 0.15%.
Or is this a transmitter problem?
Thanks.
teoaj.
RE: mass flow meter drifting from actual reading
RE: mass flow meter drifting from actual reading
My process fluid is just a normal solvent, ethanol.
However, after we repack the line, the meter became to be ok.
RE: mass flow meter drifting from actual reading
Not sure if it is valve passing or is due to the coriolis meter.
RE: mass flow meter drifting from actual reading
RE: mass flow meter drifting from actual reading
We had several lines (tubing) supplied by only one general(mother) line (tube), and each (daugther) line was connected to the mother by TEEs. So, when we were measuring in one line, the liquid was coming up from the mother and, each daugther line which were not measuring in the same time had the liquid movement reverse by "venture force" (decreasing the pressure) , and after the stop off all, the liquid move positive again (reincreasing the pressure), with no end line valvs opened.
The solution were separate the lines or exchange the TEEs for small vessels.
Hope could be clear.
RE: mass flow meter drifting from actual reading