Error detection circuit and error detection method of electromagnetic flowmeter and electromagnetic flowmeter

摘要

An electromagnetic flow meter comprises a detector having a measurement tube, a magnetic excitation coil, and a pair of detecting electrodes; a magnetic excitation circuit; a flow rate calculation circuit that calculates the flow rate of a fluid flowing through the measurement tube; and an error detection circuit comprising a differential noise measurement circuit configured to measure a level of a magnetic flux differential noise based on an electromotive force generated between the pair of detecting electrodes disposed in the measurement tube and an index calculation circuit configured to calculate an index indicating an error in the flow rate calculated by the flow rate calculation circuit based on the level of the magnetic flux differential noise measured by the differential noise measurement circuit.