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Development of Coriolis mass flowmeter with digital drive and signal processing technology
Qi-Li Hou1, Ke-Jun Xu, Min Fang
1School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China. hqili@163.com
ISA Transactions
|June 1, 2013
Summary
This study introduces a digital Coriolis mass flowmeter (CMF) drive and signal processing method. The new digital CMF maintains flowtube oscillation even in challenging two-phase flow conditions, reducing startup time.
Area of Science:
- Engineering
- Instrumentation
- Fluid Dynamics
Background:
- Coriolis mass flowmeters (CMFs) face challenges with two-phase flow, potentially leading to flowtube stalling.
- Existing methods may struggle to maintain accurate measurements under these conditions.
Purpose of the Study:
- To develop and implement a novel digital drive and signal processing method for CMFs.
- To overcome the limitations of CMFs in two-phase flow scenarios.
Main Methods:
- A digital drive method using a positive-negative step signal to initiate flowtube oscillation.
- A digital zero-crossing detection method with Lagrange interpolation for frequency and phase difference calculation.
- Implementation using a multiplying digital-to-analog converter (MDAC), direct digital synthesizer (DDS), and digital signal processor (DSP).
Main Results:
- The developed digital Coriolis mass flow transmitter demonstrated shorter start-up times.
- The transmitter successfully maintained flowtube oscillation during gas-liquid two-phase flowrate experiments.
Conclusions:
- The digital drive and signal processing approach enhances CMF performance in two-phase flows.
- The new method ensures reliable operation and measurement accuracy under challenging flow conditions.
Keywords:
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