Research of Electromagnetic Flowmeter with Grounding Electrode

Grounding electrode electromagnetic flowmeter can reduce the loss of the measurement signal,and the conductivity lower medium can be measured if the area of the grounding electrode was increased. However, if the grounding electrode area is increased, the measurement signal will be reduced. The weight function theory of electromagnetic flow meter shows that the reason is the distribution of electromagnetic flow meter weight functions is changed by the grounding electrode, lead to the induced electromotive force every point of media in the pipeline contribution to the measuring electrode is changed. the weight function of the electromagnetic flowmeter which possesses one or two grounding electrodes was analyzed respectively, get the law of electromagnetic flowmeter output signal decreases with the increase of the grounding electrode area. Finally, the relationship of the electromagnetic flowmeter output signal and the ground electrode diameter accounted for measuring the ratio of the pipe been demonstrated. This theory and method has a certain significance to research and development grounding electrode electromagnetic flowmeter.