Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2011-04-12
2011-04-12
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
C073S861120
Reexamination Certificate
active
07921736
ABSTRACT:
The invention relates to a magneto-inductive flow measuring device (1), including: A measuring tube (2), through which a medium (11) flows essentially in a direction of a measuring tube axis (16); a magnet arrangement (6, 7), which produces a magnetic field (H) passing through the measuring tube (2) and extending essentially perpendicularly to the measuring tube axis (16); a first measuring electrode (3) and a second measuring electrode (4); wherein the measuring electrodes (3, 4) are positioned in the measuring tube (2) on a connecting line, which is directed essentially perpendicularly to the measuring tube axis (16) and to the magnetic field (H); and an evaluation/control unit (12), which ascertains, on the basis of a measurement voltage tapped on the measuring electrodes (3, 4), the volume- and/or mass-flow of the medium (11) through the measuring tube (2).In order to increase the measuring accuracy of the multi-parameter flow measuring device (1), the first measuring electrode (3) is made of a first material (A) and the second measuring electrode (4) is made of a second material (C) different from the first material (A); the control/evaluation unit (12) ascertains the direct voltage portion (UD) of the voltages (U3, U4) tapped on the two measuring electrodes (3, 4) relative to a reference potential (ΦR), and makes available, on the basis of the direct voltage portion (UD), medium-specific information.
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Bacon & Thomas PLLC
Endress & Hauser Flowtec AG
Patel Harshad
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