The actual value of the flow meter deviates significantly from the set value
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For the nitrogen flow meter, the actual value is much higher than the set value, and the performance is inconsistent from time to time. What could be the cause? Is there a blockage in the three-valve assembly? If it is a blockage in the three-valve assembly, can the discharge valves on the left and right sides be opened for discharge and purging without shutting off the positive, negative, and pressure valves on those sides? I hope the expert can provide an answer. Thank you! !
Differential pressure is a flow meter; just open the balance valve and do whatever you want. . .
I don’t think it has much to do with the transmitter; why isn’t it set to automatic mode?
Leak detection of pressure tapping pipes in air separation unit; drainage and purging of three sets of valves
It’s not that you’re thinking wrong; it’s just that there was an issue I checked that day. The process team kept saying that the field transmitters were inaccurate, so the numbers transmitted were wrong. Since the instruments themselves were fine, I checked the current output to see if the zero point was set correctly. After examining it further, no problems were found, but when I looked at the calculation logic, I discovered that there was an issue with it. . . The gauge is working fine; they go ahead and mess with the transmitter just because the process indicates that the gauge is inaccurate, even though there’s nothing wrong with the gauge itself
It’s normal for there to be issues with the calculation logic in such a process, right?
If the pressure isn’t high, it’s possible to drain the fluid to check; it’s not necessarily blocked. It’s best to take out the entire gauge and send it back to the factory for inspection. 13371984667, Luo
1. For differential flow measurement, it is generally sufficient to check that the zero point is normal; it is also necessary to determine whether the squaring is done at the meter itself or by the DCS system. The configuration should be checked to ensure that the flow rate is accurate. The 2 circuits are currently in manual mode; the SP value has no effect, and it is not related to the PID parameters either. To achieve manual stabilization, adjust the SP value and tweak the PID. 3 SR connects two control valves; is this used for split-range control? The term ‘chain of images’ should be changed to ‘interlocking’