Electromagnetic flow rate measurement system and calibrator therefor

摘要

One embodiment of an electromagnetic flow rate measurement system includes electromagnetic flowmeters arranged at intervals from one another in the peripheral direction of an annular flow passage 1 in which an electric conductive fluid flows. Each of the electromagnetic flowmeters comprises: an excitation member that has magnets arranged at intervals from one another in the outer peripheral surface of the annular flow passage so as to form a magnetic field in the direction perpendicular to the outer peripheral surface of the annular flow passage; and electrodes that are provided between the magnets of the excitation member and between the magnets of the excitation member so as to measure voltage generated when the electric conductive fluid crosses the magnetic field. The polarities of the magnets at the end portions of the closest excitation members of the adjacent electromagnetic flowmeters are opposed to each other.

主权项

1. A calibrator for an electromagnetic flow rate measurement system including a plurality of electromagnetic flowmeters arranged at intervals from one another in a peripheral direction of an annular flow passage in which an electric conductive fluid flows, the calibrator comprising:
a flow passage for calibration corresponding to a part of the annular flow passage obtained by segmenting the annular flow passage in the peripheral direction; and an electromagnetic flowmeter for calibration provided in the flow passage for calibration, the electromagnetic flowmeter having:
an excitation member for calibration that has a plurality of magnets for calibration arranged at intervals from one another along an outer peripheral surface of the annular flow passage in which the electric conductive fluid flows so as to form a magnetic field in a direction perpendicular to the outer peripheral surface of the annular flow passage; anda plurality of electrodes for calibration that are provided between the magnets of the excitation member so as to measure voltage generated when the electric conductive fluid crosses the magnetic field, wherein the calibrator is configured to calculate a relationship between voltage measured by the electromagnetic flowmeter for calibration and an amount of fluid flowing in the flow passage for calibration.