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Vol. 174, Issue 7, July 2014, pp. 193-198




A Self-diagnostic Method for the Electrode Adhesion of an Electromagnetic Flow-meter

Wen-Hua Cui, * Bin Li, Xue-Jing Li, Song Gao

School of Mechatronic Engineering and Automation, Shanghai University, 149, Yanchang Road, Shanghai 200072, P.R. China
Tel.: +86 021 56331637, fax: +86 021 36033235

E-mail: sulibin@shu.edu.cn, cuiwhlib@gmail.com


Received: 16 May 2014 /Accepted: 30 June 2014 /Published: 31 July 2014

Digital Sensors and Sensor Sysstems


Abstract: Electrodes of electromagnetic flow-meter are subject to contamination in sewage measurement. In this paper, the relationship between the internal resistance of the flow-induced voltage and the electrode contamination is analyzed on the basis of numerical analysis. A new self- diagnostic method for electrode adhesion with additional excitation based on photovoltaic cell is proposed, in which magnetic excitation for flow-rate measurement and electric excitation for electrode self-diagnosis is divided in both time domain and frequency domain. A dual-excited electromagnetic flow-meter with electrode self-diagnosis was designed and validated. Simulation experiments based on the change of the internal resistance of the flow-induced voltage were carried out. And the experimental results fully show that this new method is feasible and promising.


Keywords: Electrode adhesion self-diagnosis, Electromagnetic flow-meter, Dual excitation, Photovoltaic cell.


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