Patent ID: 6847901

Claim:
An electromagnetic flowmeter comprising: a coil which applies a magnetic field to a fluid flowing in a pipe line; exciting means for supplying an exciting current to said coil; and arithmetic processing means for calculating a measurement flow rate on the basis of a measurement signal detected from the excited fluid, said arithmetic processing means including measurement flow rate calculation means for, in calculating a measurement flow rate from the measurement signal, correcting the flow rate calculated from the measurement signal on the basis of one of adjustment coefficients set, in advance in correspondence with current values of exciting currents, which corresponds to a current value of an exciting current by which the measurement signal is obtained, wherein said arithmetic processing means comprises exciting current switching control means for switching/selecting in accordance with a calculated flow rate one of a plurality of current values prepared in advance as current values of exciting currents, wherein said arithmetic processing means comprises adjustment coefficient setting means for calculating an adjustment coefficient for correcting a flow rate for each exciting current switched by said exciting current switching control means.