Measuring and testing – Volume or rate of flow – System
Patent
1979-03-08
1980-12-02
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
G01F 158
Patent
active
042364116
ABSTRACT:
An electromagnetic flowmeter having a flow tube provided with a pair of diametrically-opposed electrodes, the fluid to be metered passing through the tube to intercept a magnetic field thereon, thereby inducing a signal at the electrodes which is a function of flow rate. In this arrangement, X is the axis connecting the electrodes, Z is the axis of the tube and Y is an axis mutually perpendicular to the X and Z axes. In order to minimize the adverse effect of disturbances in flow profile on the flow-induced signal, an electromagnetic field is established by an electromagnet assembly formed by two pairs of electromagnets, each pair being disposed at diametrically-opposed positions on the tube exterior to produce a magnetic field whose lines of flux are substantially parallel to the Y axis, the two paris being symmetrically disposed on either side of the X-Y electrode plane to create a combined magnetic field having a B.sub.y component whose magnitude as represented by a curve whose base line lies parallel to the Z axis, assumes a saddle formation having a trough whose midpoint is substantially coincident with this plane.
REFERENCES:
patent: 3373608 (1968-03-01), Ketelsen
patent: 3566687 (1971-03-01), Mittelmann
patent: 3589186 (1971-06-01), Bourg
Ebert Michael
Fischer & Porter Co.
Ruehl Charles A.
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