Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-09-30
1996-07-30
Williams, Hezron E.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386111, G01L 100
Patent
active
055401031
ABSTRACT:
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.
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Biegel Ronald L.
Endress+Hauser Flowtec AG
Williams Hezron E.
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