Rosemount mass flow meter error

It’s not fixed properly. Check if the tube is shaking. How is the levelness?

If everything is fine above, please send over the process instrument parameters and I’ll help you do the calculations.

If everything is fine after the calculation, there’s no other choice but to turn to the manufacturer for a solution.

Check whether the pipeline is vibrating and if there is any electromagnetic interference....

If it is confirmed that the selection and installation are correct, then the focus should shift to examining external factors, such as pipeline vibrations and signal interference as mentioned above. It is also necessary to check the process control, ensure that the medium pressure is stable, that the pipes are fully filled, and that the conditions for measurement are met. Additionally, the service life of the instrument, its maintenance status, and the condition of its circuit board must all be taken into consideration. If there are any graphs available, it is best to analyze them as well

1 Try reducing the instrument sensitivity a bit (if such an option is available). 2 What is the medium used in the process? If a liquid is measured, it may contain an excessive amount of gas. 3 Check whether the wiring from the sensor to the gauge head is loose, and whether there are any poor connections at the joints. 4 Check whether there are still fluctuations in the readings without using a medium

Thank you! These flow meters are used for loading purposes; there is no flow when they’re not in use. The issue is that during loading, sometimes more and sometimes less volume is delivered – 1 ton when more is loaded, and around 600 Kg when less is loaded. The pipes vibrate normally, and the pressure difference between the front and back is also within a reasonable range

　 1 Tag Number FT-9301 General Description 2 Purpose SERVICE X-9301 Feed Flow Accumulation Indication & Regulation CONTROL GENERAL 3 Line No. AA-93001 4 |P&ID No. PID-9301 5 Pipe Size PIPING SIZE 4” 6 Class CLASS AS1J 7 Pipe Material PIPING MATERIAL S.S. 8 9 Fluid Name FLUID NAME Acrylic 10 State STATE Liquid Process Conditions 11 Flow Maximum MAX 50640 12 FLOW Normal NOR 42200 PROCESS 13 kg/h Minimum MIN 21100 CONDITIONS 14 Design/Operating Pressure MPaG DESI/OPER. PRESS. 1/0.45 15 Design/Operating Temperature °C DESI/OPER. TEMP. 60/20 16 Operating Density kg/m3 OPER. DENSITY 1050 17 Standard Density kg/Nm3 STD. DENSITY 18 Molecular Weight M.W. 19 Kinetic Viscosity KINE. VISC. 20 Dynamic Viscosity CP(mPa.s) DYN. VISC. 1.2 21 Adiabatic Index Cp/Cv 22 Compression Factor COMP. FACTOR 23 Humidity HUMIDITY 24 Vacuum Possibility VACUUM POSSIBILITY 25 Solid Mass Content SOLID MASS CONTENT 26 Conductivity CONDUCTIVITY 27 Maximum Allowable Pressure Drop MPa MAX. ALLOW. PRESS. DROP 0.05 28 29 Tag No. FT-9301 Flow Meter 30 Type TYPE Integrated METER UNIT 31 Nominal Diameter DN Confirmed by manufacturer 32 Pressure Rating PRESS. RATING 150LB 33 Flow Measurement Range FLOW MEAS. RANGE 0~60000kg/h 34 Density Measurement Range DENSITY MEAS. RANGE 35 Accuracy ACCURACY ±0.2% 36 Calculated Pressure Drop CALCULATED PRESS. DROP 37 Connection Type CONN. TYPE Flanged connection HG/T20615-2009 RF 38 Size SIZE 39 Flow Direction FLOW DIRECTION 40 Meter Pipe Material METER PIPING MATERIAL 316LSS 41 Flange Material FLANGED MATERIAL 304 SS 42 Electrical Connection ELEC. CONN. 1/2”NPT(F) 43 Connection Cable CONN. CABLE 44 Length LENGTH 45 Protection Level ENCLOSURE PROTECTION IP65 46 Explosion Proof Rating EXPLOSION PROOF Ex dIIBT4 47 48 Tag No. Converter 49 Output Signal OUTPUT SIGNAL 4~20mA, HART protocol CONVERTOR 50 Power Supply POWER SUPPLY 24V DC (external power) 51 Mounting Position MOUNT POSITION 52 Electrical Connection ELEC. CONN. 1/2”NPT(F)x2 53 Protection Level ENCLOSURE PROTECTION IP65 54 Explosion Proof Rating EXPLOSION PROOF Ex dIIBT4 56 Accessories 57 ACCESSORIES 58 59 60 Manufacturer MANUFACTURER 61 Supplier SUPPLIER Model and Quantity 62 Flow Meter Model FLOWMETER MODEL 63 Quantity QTY’S 1 MODEL&QTY’S 64 Converter Model CONV. MODEL 65 Quantity QTY’S 1 Notes: NOTES: 　 　 　 　 　 　 　 　 　

Here is the flow meter data sheet for your review

Check whether the pipeline is vibrating, whether the instrument enclosure is grounded, and whether the shielding of the signal wires is properly grounded. I guess selecting the appropriate model in a design institute is not a problem; if the inspections show no issues, then it’s necessary to check whether the pump’s performance is stable. Is it possible for the medium to have two Liu values? In case that doesn’t work, in case there’s a problem, the damping time can be increased a bit, but it is recommended not to use this method.