Electromagnetic flow measuring arrangement

Details Electromagnetic flow measuring arrangement Electromagnetic flow measuring arrangement

1988-09-29

1990-06-12

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 158

Patent

active

049322680

ABSTRACT:
In an electromagnetic flow measuring arrangement an electrically conductive fluid flows through a measuring tube in which a magnetic field is generated transversely of the flow direction, whereby a voltage is induced which is proportional to the flow velocity. This voltage is tapped by means of two electrodes. The cavity of the measuring tube has an elliptical cross-section with two major axes, the first major axis coinciding with the connecting line of the two electrodes, and the second major axis coinciding with the direction of the magnetic field. The flow to be measured is proportional to the product of the measured flow velocity and the cross-section area of the cavity of the measuring tube. The flow measuring arrangement is constructed so that on changes of the cavity cross-section caused by external influences the cross-section retains substantially the profile of an ellipse and the length of the second major axis remains substantially constant. In this way external influences, such as pressure and temperature, that change the cross-section of the cavity of the measuring tube, do not affect the measuring result.

REFERENCES:
patent: 2896451 (1959-07-01), Rinia
patent: 4281552 (1981-08-01), Nissen et al.
patent: 4635486 (1987-01-01), Jacobsen et al.
patent: 4715233 (1987-12-01), Neven et al.

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