Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2007-03-27
2007-03-27
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
Reexamination Certificate
active
11213576
ABSTRACT:
A magnetoinductive flowmeter and a method for operating same utilizing a measuring tube through which flows an electrically conductive medium, as well as two measuring electrodes and a magnet with two field coils positioned parallel to each other on mutually opposite sides of the measuring tube. The measuring electrodes are so positioned that their connecting line extends along an essentially perpendicular vector relative to the direction of flow and to the magnetic field as well as through the cross-sectional center of the measuring tube. For normal flow-measuring operation, the two field coils are so energized that an essentially homogeneous magnetic field is generated, permeating the medium flowing through the measuring tube, while for determining the flow rate the voltage present between the two measuring electrodes is collected at one or both measuring electrodes and measured against a reference potential. The normal flow-measuring operation is intermittently interrupted and the two field coils are energized in a manner as to generate an inhomogeneous magnetic field that permeates the medium flowing through the measuring tube, and the voltage present between the two measuring electrodes is collected. This permits a diagnosis of the flowmeter.
REFERENCES:
patent: 4410926 (1983-10-01), Hafner et al.
patent: 5369999 (1994-12-01), Yoshida
patent: 5493914 (1996-02-01), Schafer
patent: 5646353 (1997-07-01), Mesch et al.
patent: 6634238 (2003-10-01), Budmiger
Brockhaus Helmut
Florin Wilhelm
Poortmann Boudewijn Jozef
van Willigen Arnould Leendert
Cesari & McKenna LLP
Krohne Messtechnik GmbH & Co. KG
Patel Harshad
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