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An electromagnetic flowmeter includes a yoke of a solenoid unit, which is accommodated in the interior of a body. The yoke is U-shaped in cross section, with a pipe unit including a measurement conduit being arranged in the interior of the yoke. One end portion and another end portion of the measure

An electromagnetic flowmeter includes a yoke of a solenoid unit, which is accommodated in the interior of a body. The yoke is U-shaped in cross section, with a pipe unit including a measurement conduit being arranged in the interior of the yoke. One end portion and another end portion of the measurement conduit are formed with true circular shapes in cross section, whereas an intermediate portion thereof between the one end portion and the other end portion is formed with an oval shape in cross section. On the measurement conduit, cross-sectional straight line portions thereof, which are formed in the intermediate portion, are arranged in a vertical direction. Coils of the solenoid unit and excitation plates are arranged in facing relation to the cross-sectional straight line portions.

대표청구항 ▼

1. An electromagnetic flowmeter including a body having an upstream side port and a downstream side port connected by a fluid passage, a measurement conduit disposed between the upstream side port and the downstream side port in an interior of the body, and a pair of coils and a pair of electrodes,

1. An electromagnetic flowmeter including a body having an upstream side port and a downstream side port connected by a fluid passage, a measurement conduit disposed between the upstream side port and the downstream side port in an interior of the body, and a pair of coils and a pair of electrodes, each pair being arranged in confronting relation to each other on an outer circumferential side of the measurement conduit, wherein the measurement conduit is formed integrally from a resin material, one end portion and another end portion thereof along an axial direction, which are connected to the upstream side port and the downstream side port, are formed with true circular shapes in cross section, an intermediate portion thereof between the one end portion and the other end portion is formed with an oval shape in cross section, the coils are arranged in confronting relation to cross-sectional straight line portions formed on an outer circumferential surface of the intermediate portion, and the electrodes are arranged perpendicularly with respect to the coils. 2. The electromagnetic flowmeter according to claim 1, wherein the coils are retained on a yoke formed with a U-shape in cross section, the measurement conduit being disposed in an interior of the yoke. 3. The electromagnetic flowmeter according to claim 1, wherein a cover member, which is mounted on the body and made from a metal material, is disposed at a position isolated from ground potential. 4. The electromagnetic flowmeter according to claim 1, wherein the intermediate portion is formed with an oval shape in cross section, which is elongated toward circuit boards disposed in the body. 5. The electromagnetic flowmeter according to claim 1, wherein the electrodes are disposed on an outer circumferential surface of the measurement conduit, with foam sheets being mounted thereon covering the electrodes. 6. The electromagnetic flowmeter according to claim 3, wherein the ground potential is constituted from a pair of attachments, which are disposed on opposite ends in the axial direction of the body, and the attachments include the upstream side port and the downstream side port respectively therein.