Influence of Coriolis Mass Flowmeter Amplitude on Zero Point
HUANG Ya1,XU Ke-jun1,2,LIU Chen-ci1
1. School of Electrical and Automation Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
2. Engineering Technology Research Center of Industrial Automation, Anhui Province, Hefei, Anhui, 230009, China
Abstract：Aiming at the problem of the zero drift caused by the change of the Coriolis mass flowmeter amplitude, the flexural vibration equation of the flow tube is first established by simplifying the model, the displacement response of the two detection points is solved, and the linear relationship between the zero phase difference and the amplitude is obtained; Then, the amplified signals of the sensors under different amplitudes are collected, a zero-crossing detection algorithm to calculate the zero-point phase difference is written, a straight line between the zero point and the amplitude is established, and the linear relationship between the zero point and the amplitude through experiments is verified; Finally, combined the verification procedures and the zero point calculation results, the measurement error introduced the zero point drift caused by the amplitude change is analyzed qualitatively and quantitatively, the results show that the greater the amplitude change, the greater the measurement error introduced, when the flow rate is 10kg/min, the amplitude change 10mV introduces a measurement error of 0.727%.
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2023, Vol. 44 
