Patent ID: 8127622

Claim:
An electromagnetic flowmeter comprising: a body; a measurement tube accommodated in the interior of the body and having a flow passage through which a fluid to be measured flows; a pair of electrodes disposed opposing each other on an outer circumferential side of the measurement tube and configured to detect an electromotive force generated by a flow of the fluid to be measured; and a solenoid unit disposed transversely to the electrodes on the outer circumferential side of the measurement tube, and having coils, which are each wound around a core and are excited by supplying electricity thereto and which generate a magnetic field inside the measurement tube, wherein the solenoid unit comprises a pair of yokes configured to retain the coils and the cores, the yokes being arranged opposing each other and sandwiching the measurement tube therebetween, wherein the measurement tube is disposed detachably with respect to the body, and the yokes each include a planar surface portion having four sides, and each of the four sides has a bent portion protruding therefrom which is centered about a respective one of the coils toward a side of the measurement tube, wherein at least two of the four sides are bent perpendicular to the planar surface portion to thereby provide barrier walls configured to prevent leakage of magnetic flux from the coils.