Magnetic flow meter with reference electrode
First Claim
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1. A magnetic flow meter comprising:
- measurement circuitry;
a flowtube;
at least first and second electrodes disposed within the flowtube and coupled to the measurement circuitry;
at least a reference electrode operably coupled to the measurement circuitry and disposed to electrically couple to process fluid within the flowtube; and
a current limiter coupled to the reference electrode and adapted to couple to the measurement circuitry, the current limiter configured to reduce corrosion of the reference electrode.
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Abstract
An magnetic flow meter is provided which includes a reference electrode configured to electrically couple process fluid flowing within a flowtube of the flow meter. The reference electrode is adapted to measure potential of the process fluid. A current limiter is configured to limit current flow through the reference electrode and thereby reduce corrosion of the reference electrode.
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Citations
19 Claims
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1. A magnetic flow meter comprising:
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measurement circuitry;
a flowtube;
at least first and second electrodes disposed within the flowtube and coupled to the measurement circuitry;
at least a reference electrode operably coupled to the measurement circuitry and disposed to electrically couple to process fluid within the flowtube; and
a current limiter coupled to the reference electrode and adapted to couple to the measurement circuitry, the current limiter configured to reduce corrosion of the reference electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A flowtube for a magnetic flow meter, the flowtube comprising:
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a conductive tube having a non-conductive inner surface;
first and second electrodes disposed on an inner surface and being adapted to contact process fluid;
a reference electrode mounted to the conductive tube, and electrically isolated therefrom, the reference electrode being disposed to electrically couple to process fluid; and
a current limiter configured electrically coupled to the reference electrode and being adapted to couple in series to a measurement circuitry. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of reducing corrosion of a reference electrode configured to sense a potential of process fluid in a magnetic flow meter, comprising:
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disposing at least first and second electrodes within a flowtube and coupled to flow measurement circuitry;
obtaining a current limiter; and
placing the current limiter electrically in series with the reference electrode and flow measurement circuitry, the current limiter configured to reduce corrosion of the reference electrode. - View Dependent Claims (17, 18, 19)
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Specification