CALIBRATION METHOD AND CALIBRATION SYSTEM OF ELECTROMAGNETIC FLOWMETER

摘要

PROBLEM TO BE SOLVED: To realize calibration of a detector of an electromagnetic flowmeter without making water flow into the electromagnetic flowmeter at a low cost.;SOLUTION: A calibration method of an electromagnetic flowmeter includes: a measurement step (S1) for measuring a cross-section area of a measurement tube and a distance between electrodes; a measurement step (S2) for measuring density of a magnetic flux at a center of the measurement tube and density of a magnetic flux in the vicinity of the electrodes; a parabolic distribution function calculation step (S3, S4) for multiplying the density of a magnetic flux by a weight function indicating contribution to electromotive force generation, of a flow rate of fluid flowing in the measurement tube, and determining a parabolic distribution function showing a relation between a position where the density of a magnetic flux is measured and the calculated multiplication value; a parameter calculation step (S5) for integrating a formula of the parabolic distribution function from a position of one electrode to a position of the other electrode so as to calculate an electromotive force parameter which is proportional to electromotive force generated by the fluid flowing on a straight line connecting the electrodes; and a correction coefficient calculation step (S6) for calculating a correction coefficient on the basis of the electromotive force parameter and the cross-section area of the measurement tube.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2016,JPO&INPIT