Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-10-13
1996-04-02
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386111, G01F 100
Patent
active
055030270
ABSTRACT:
An electromagnetic flowmeter with conventional orthogonal electrode and magnetic axes (x, y) intersecting the flowtube axis (z) has its electrodes constituted by two pairs (1, 2 and 3, 4) of electrodes mounted in insulating tubing (5) on each side of the flow passage through the tubing. Four conductors extend respectively from the four electrodes to enable the potential difference between the two electrodes on each side due to an axial component on each side of eddy current electric field in the liquid to be determined for self-calibration purposes in compensating automatically for any extraneous change in the magnetic field and the average potential of each pair of electrodes can also be determined to derive the velocity of flow of the liquid. One of the two pairs of electrodes can be replaced by a single electrode. The electrodes can be point electrodes or electrodes of substantial area and methods are described for mathematically adapting various types of electrodes of the required purpose and to eddy currents in parts of the assembly. The invention can also be applied to an eddy current probe for giving readings of sensitivity at a conventional flowmeter.
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Examiner's report to the Comptroller under Section 17 (The Search Report); Application No. 8921702.2; Examiner H. Collingham; Dec. 13, 1989; UK Patent Office.
Biegel Ronald
Chilcot Richard
The Foxboro Company
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