Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1987-06-25
1988-10-04
Tokar, Michael J.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 158
Patent
active
047748443
ABSTRACT:
An electromagnetic flowmeter having a frame assembly formed by an octagonal metal frame within which are mounted a pair of electromagnets and a pair of electrode holders. The electromagnets are secured to one set of opposing sides of the frame along a first transverse axis which passes through the geometric center of the frame while the holders are secured to another set of opposing sides along a second tranverse axis which passes through the center at right angles to the first axis. The frame assembly is encapsulated within a generally cylindrical plastic insulating body of polymeric material having a longitudinal bore therein defining a flow conduit whose flow axis passes through the geometric center of the frame and is perpendicular both to the first and second transverse axes whereby when the fluid flows therethrough it intersects the magnetic lines of flux produced by the electromagnets. The resultant voltage induced in the fluid is a function of its flow rate and is picked up by the electrodes to provide a flow rate signal. To prevent the plastic body from cracking as a result of differences between the thermal coefficient of expansion of the metal frame and that of the polymeric material, an interfacial layer is formed therebetween having elastomeric properties.
REFERENCES:
patent: 4181018 (1980-01-01), Schmoock
patent: 4186600 (1980-02-01), Appel et al.
patent: 4281552 (1981-08-01), Nissen et al.
patent: 4358963 (1982-10-01), Schmoock
patent: 4567775 (1986-02-01), Schmoock
Bell Robert P.
Ebert Michael
Fischer & Porter Co.
Tokar Michael J.
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