Influence of Zero Point and Damping Coefficient on Measurement of Mass Flow Meter

The influence of zero point and damping coefficient on mass flowmeter measurement Like other mechanical and electrical systems, Coriolis mass flowmeters also have zero point adjustment problems. The flow range given by the Coriolis mass flowmeter manufacturer generally starts from zero flow, and the user determines the small and large flow according to his own needs. For some flowmeters, the small flow may be lower. At this time, the influence of the zero offset on the accuracy larger. Therefore, it is stipulated in the inspection regulations“Run the flowmeter at 50% of the maximum verified flow rate that can be achieved for a period of time, generally not less than 10 minutes, and then adjust the zero point according to the requirements of the manual”. Due to different manufacturers, the method of zero adjustment is also different, but there are some points that must be paid attention to: before zero adjustment, it must be closed“small signal excision”Function; the flowmeter is filled with medium and the upstream and downstream valves are closed, etc. Influence of damping coefficient: Coriolis mass flowmeters have different basic measuring objects compared with turbine, vortex street and positive displacement flowmeters. Measuring object of Coriolis mass flowmeter --- Measuring object of turbine etc. --- continuous pulse (inherent) In this way, Coriolis mass flowmeter involves the problem of sampling and reading update rate. This update rate also affects its output. The dynamic response speed of the Coriolis mass flowmeter is extremely fast, and the fluid fluctuation and fluid noise can be reflected by the Coriolis mass flowmeter, while the turbine and positive displacement flowmeter are sensitive to small fluid fluctuation and noise due to their mechanical inertia. Has a smoothing effect. Therefore, in order to make the reading more stable, the Coriolis mass flowmeter generally adds the setting of damping coefficient to smooth fluctuation and noise. The update rate of readings and output is related to the natural frequency of the measuring tube and the damping coefficient set by the software. If you use a spherical volume tube and a small volume tube during calibration, pay attention to setting the damping coefficient to a low value to avoid the situation shown in the figure above.

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