Patent ID: 6853928

Claim:
A two-wire electromagnetic flowmeter comprising: an exciting coil which generates a magnetic field in a direction perpendicular to a flowing direction of a fluid that flows through a measurement tube; a flow measuring output circuit which adjusts an output current that flows to a pair of power supply lines to which an external power is supplied, in accordance with a flow measurement value obtained on the basis of a signal electromotive force which is generated in a direction perpendicular to the flowing direction of the fluid that flows through the measurement tube and the direction of the magnetic field generated from said exciting coil; and an exciting circuit which is connected in series with said flow measuring output circuit between the pair of power supply lines and supplies part of the output current to said exciting coil as an exciting current, wherein said exciting circuit comprises an exciting voltage circuit which generates an exciting voltage between first and second lines, an exciting current adjustment circuit which adjusts a value of the exciting current in accordance with a magnitude of the output current adjusted by said flow measuring output circuit, and a capacitor which is connected in parallel with said exciting voltage circuit between the first and second lines.