초록 ▼

To minimize the material consumption for coils, their pole pieces, and the magnetic return path in electromagnetic flow sensors with reduced overall length and nominal diameters between 200 mm and 700 mm, a measuring tube is provided through which flows an electrically conductive fluid to be measure

To minimize the material consumption for coils, their pole pieces, and the magnetic return path in electromagnetic flow sensors with reduced overall length and nominal diameters between 200 mm and 700 mm, a measuring tube is provided through which flows an electrically conductive fluid to be measured, and which has at least two measuring electrodes. At the measuring tube, means are provided for generating a magnetic field passing through the measuring tube which comprise: coils, coil cores, and pole stampings which are disposed diametrically opposite to each other on the outside surface of the measuring tube and extend on both sides of the respective coil in the circumferential direction, with their ends separated by a sufficient distance, and two magnetic return-path stampings each disposed on the outside surface of the measuring tube on one side of the coils and the pole stampings and completely surrounding the measuring tube and magnetically coupled via the coil cores to the pole stampings. The coils, coil cores, pole stampings, and return-path stampings are surrounded with an enclosure. For nominal diameters above 500 mm, two pairs of coil sections are provided.

대표청구항 ▼

An electromagnetic flow sensor comprising a nonferromagnetic metallic measuring tube through which flows an electrically conductive fluid to be measured and whose inside surface is lined with an insulating layer, whose nominal diameter is 200 mm to 700 mm, which has at least two measuring electrodes

An electromagnetic flow sensor comprising a nonferromagnetic metallic measuring tube through which flows an electrically conductive fluid to be measured and whose inside surface is lined with an insulating layer, whose nominal diameter is 200 mm to 700 mm, which has at least two measuring electrodes, and at which means are provided for generating a magnetic field passing through the metallic measuring tube which comprise: non-saddle-shaped coils disposed diametrically opposite to each other at the outside surface of the metallic measuring tube, coil cores, pole pieces of soft magnetic material which extend on both sides of the respective non-saddle-shaped coil in the circumferential direction and formed with ends separated by a distance, two soft magnetic return-path regions each disposed on one side of the coils and of the pole pieces and completely extending around the measuring tube, said return-path stampings or regions being respectively magnetically coupled via the coil cores to the pole pieces, and an enclosure surrounding at least one of the coils, the coil cores, the pole pieces and the return-path regions.