Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2011-06-21
2011-06-21
Thompson, Jewel (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
Reexamination Certificate
active
07963173
ABSTRACT:
A magnetic flowmeter for measuring flow of a flow of process fluid, includes a flow tube arranged to receive the flow of process fluid therethrough. A magnetic drive coil proximate the flow tube is arranged to apply a magnetic field to the flow in response to a drive signal. At least one electrode is arranged to sense an electrical potential of the process fluid which related to the applied magnetic field and flow rate of the process fluid. Temperature measurement circuitry is coupled to the magnetic drive coil and is configured to provide a temperature output indicative of temperature of the drive coil based upon an electrical parameter of the drive coil. Flow measurement circuitry coupled to the at least one electrode is configured to provide a flow output based upon sensed electrical potential.
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The International Search Report and Written Opinion for corresponding PCT/US2010/032484, filed Apr. 27, 2010.
Foss Scot R.
Schulz Robert K.
Rosemount Inc.
Thompson Jewel
Westman Champlin & Kelly P.A.
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