A Validated Model for the Zero Drift Due to Transformer Signals in Electromagnetic Flowmeters Operating With Electrolytic Conductors

摘要

In this paper, the author investigates theoretically the magnitudes of the zero offsets and the zero drifts originating from magnetic-flux linkage between the coils of the electromagnet and the loop formed by the electrode cables in an electromagnetic flowmeter for electrolytic conductors. The dependence of such zero offsets on the liquid properties, frequency of operation, etc., is explained. This dependence is used to predict the zero offsets expected in metering this liquid using phase-sensitive detection with the flowmeter tube described in this paper. Precautions needed in flowmeter design to minimize instrument offsets and zero drifts are explained. In the end, the proposed model was validated against the experimental data