Fluid flow meters
AssigneeNational Research Development Corporation
InventorsJohn Hemp, Derek Gerald Wyatt
Life of this patent
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Abstract
An electromagnetic flowmeter comprises an iron tube surrounding a non-magnetic electrically insulating tube through which the fluid flows. Windings formed by printed circuit conductors are located on the inner surface of the iron tube and produce a main magnetic field in one direction in the electrode plane and subsidiary magnetic fields in the opposite direction upstream and downstream of the electrode plane.
Claims5
An electromagnetic flowmeter for measuring the rate of fluid flow in a duct of circular cross-section, comprising a pair of electrodes disposed at diametrically opposed positions on the duct, main winding means for producing a main magnetic field in the duct extending transversely between the electrodes to establish a signal across the electrodes, and first, second, third and fourth subsidiary winding means spaced around the main winding means for producing respective subsidiary magnetic fields having components parallel to but in the opposite direction to the main magnetic field in the duct, the first and second subsidiary (magnetic fields) winding means each being disposed adjacent to a respective electrode upstream thereof and the third and fourth subsidiary (magnetic fields) winding means each being disposed adjacent to a respective electrode downstream thereof.
Dependencies are inferred from the claim text.