Electrode leakage diagnostics in a magnetic flow meter
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United States of America Patent
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Aug 26, 2003
Issued Date -
N/A
app pub date -
May 23, 2000
filing date -
Dec 10, 1998
priority date (Note) -
In Force
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Abstract
A magnetic flow meter has a diagnostic circuit that indicates leakage from flowtube electrodes. The diagnostic circuit couples to the electrodes and to ground. The diagnostic circuit samples diagnostic potentials between each electrode and ground, and then generates a sum of the diagnostic potentials between a first and a second electrode that indicates the leakage. The flowtube includes an insulated tube and an electromagnet. A transmitter circuit couples to the electromagnet and electrodes, and then generates a transmitter output representing a flow rate, which can be corrected for the leakage.
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