E+H mass flow meter
Thread Content
The resin production area in the factory is equipped with a feed tank line for which maleic anhydride is used as the medium. An E+H mass flow meter is employed there, but it exhibits significant errors. However, once the meter is removed and calibrated, it functions properly; calibration by the local metrology authority also shows no issues. Yet, once maleic anhydride starts flowing through the system, errors reappear. I would appreciate it if experienced colleagues could help analyze what might be causing this phenomenon
Personally, I think it’s a problem with the selection of the appropriate model. The detection principle of E+H mass flow meters is based on the Coriolis force; these flow meters vibrate during operation. Your medium – which is described as colorless needle-shaped or flake-shaped crystals belonging to the orthorhombic crystal system (as found online) – seems to be some kind of crystalline substance, and its presence can affect the detection process when it passes through the flow meter； For reference only
The parameters you provided are far from enough – temperature, pressure, installation photos. All of this will affect accuracy
There are probably very few metrology bureaus that can calibrate this device. How do you calculate the error? And why do you think it’s the fault of the mass flow meter?
Is there a problem with the installation? The elbow part of the gauge should be perpendicular to the ground, or it may be necessary to reset it to zero after installation. Also, check the density of the medium to see if it is close to the theoretical value; if there is a large deviation, it’s possible that the pipe isn’t filled properly or that there is a gas-liquid mixture present!
Calibration definitely isn’t done using actual physical samples; this indicates that it’s still a problem related to the medium and operating conditions at the site
Mass flow meters have quite high requirements regarding installation; they must be positioned with their inlet side facing upward. This helps to minimize the impact of any crystals or particles on the mass measurement. Additionally, it is necessary to compare the density indicated on the meter with the design density, which enables a more accurate assessment
What’s the temperature? Will the medium crystallize or cause deposits? Has a flow meter model with a thermal insulation jacket been selected? Is the medium homogeneous?
What’s the temperature? Will the medium crystallize or cause deposits? Has a flow meter model with a thermal insulation jacket been selected? Is the medium homogeneous?