Capacitance type electromagnetic flowmeter

Details Capacitance type electromagnetic flowmeter Capacitance type electromagnetic flowmeter

1993-08-30

1995-06-06

Chilcot, Jr., Richard F.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

7386108, G01F 153

Patent

active

054212103

ABSTRACT:
A capacitance type electromagnetic flowmeter which is capable of measuring flow rates of fluid without being affected by the flow velocity distribution. When the flow tube of the flowmeter is an open conduit, the measurement is made without being affected by variations in the liquid level. The flowmeter comprises a flow tube insulated at least on an inner surface thereof; an exciting means for applying a magnetic field to the fluid, and a pair of detecting electrodes disposed in the flow tube, which are electrically insulated from the fluid and extend at right angles to the flow tube axis and magnetic field. The length of the electrodes is proportional to the cosine of an angle between a line normal to the wall of the flow tube and an axis perpendicular to both axes of the flow tube and magnetic field. Where a conduit is used, the liquid has a free surface, and currents produced from the detecting electrodes are converted by a current-to-voltage converter into voltage signals.

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patent: 4434666 (1984-03-01), Hemp et al.
patent: 4631969 (1986-12-01), Schmoock
patent: 4658652 (1987-04-01), Picone et al.
patent: 4953408 (1990-09-01), Appel et al.
patent: 5271280 (1993-12-01), Nissen
patent: 5325724 (1994-07-01), Kiene et al.

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