Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2011-07-05
2011-07-05
Thompson, Jewel (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
Reexamination Certificate
active
07971493
ABSTRACT:
The disclosure relates to a method for operation of a flow measurement device, and to a flow measurement device itself. In order in this case to record the conductivity of the medium or faults resulting from deposits by means of a measurement tube configuration in a technically simple manner, a total of at least 4 electrodes are arranged distributed on the circumference of the measurement tube, in the measurement tube. When a signal is fed in at one of the electrodes or at an electrode pair, an electric current is measured between one electrode pair, while an electrical voltage is measured between another electrode pair. An impedance value is determined from the two measured values, from which impedance value a conductivity of the medium is determined and/or in comparison of different conductivities or in comparison with historical values, it is deduced that there is a covering layer on the electrodes.
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patent: 2003/0051557 (2003-03-01), Ishikawa et al.
patent: 2005/0115334 (2005-06-01), Brockhaus et al.
patent: 10243748 (2003-04-01), None
German Examination Report dated Oct. 20, 2008.
Hencken Kai
Schrag Daniel
Wray Troy
ABB AG
Buchanan & Ingersoll & Rooney PC
Thompson Jewel
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