ELECTROMAGNETIC FLOWMETER ERROR DETECTION CIRCUIT AND ERROR DETECTION METHOD, AND ELECTROMAGNETIC FLOWMETER

摘要

To provide an electromagnetic flowmeter with which it is possible to confirm the accuracy of a flowmeter currently in use.SOLUTION: Provided is an electromagnetic flowmeter including a detector (1) having a measuring tube (11), an exciting coil (14), and a pair of detection electrodes (12a, 12b), an excitation circuit (3), and a flowrate calculation circuit (4) for calculating the flowrate of a fluid flowing in the inside of the measuring tube. The electromagnetic flowmeter comprises: a differential noise measurement circuit (5) constituted so as to measure the level of magnetic flux differential noise from the electromotive force generated in the pair of detection electrodes (12a, 12b) arranged inside the measuring tube (11); and an index calculation circuit (6) constituted so as to calculate, on the basis of the level of the magnetic flux differential noise measured by the differential noise measurement circuit, an index that represents an error of the flowrate calculated by the flowrate calculation circuit.SELECTED DRAWING: Figure 1