Flow meter and method for detecting a cable fault in a cabling of the flow meter
First Claim
1. A meter electronics (20) for detecting a cable fault in a cabling (205) of a flow meter (5), with the meter electronics (20) including first and second pickoff sensors (201a and 201b) and the cabling (205) coupled to the first and second pickoff sensors (201a, 201b) and including one or more first pickoff wires and one or more second pickoff wires, with the meter electronics (20) being characterized by:
- a signal injection device (203) coupled to the cabling (205), with the signal injection device (203) being configured to generate an injection signal and communicate the injection signal into the cabling (205) and to the first and second pickoff sensors (201a, 201b); and
a signal conditioning circuit (202) coupled to the cabling (205), with the signal conditioning circuit (202) being configured to receive at least one response signal from at least one of the first and second pickoff sensors (201a, 201b) in response to the injection signal and determine one or more of a pickoff open wire fault and a pickoff connection orientation fault in one or both of the one or more first pickoff wires and the one or more second pickoff wires of the cabling (205).
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Accused Products
Abstract
A method for detecting a cable fault in a cabling of a flow meter is provided according to an embodiment of the invention. The method includes testing one or more first pickoff wires and one or more second pickoff wires of the cabling for pickoff open wire faults. The method further includes testing the first pickoff wires and the second pickoff wires for pickoff connection orientation faults if no pickoff open wire faults are determined in the first pickoff wires and the second pickoff wires. The method further includes testing one or more driver wires of the cabling for driver open wire faults. The method further includes testing the driver wires for a driver connection orientation fault if no driver open wire faults are determined in the driver wires.
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Citations
11 Claims
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1. A meter electronics (20) for detecting a cable fault in a cabling (205) of a flow meter (5), with the meter electronics (20) including first and second pickoff sensors (201a and 201b) and the cabling (205) coupled to the first and second pickoff sensors (201a, 201b) and including one or more first pickoff wires and one or more second pickoff wires, with the meter electronics (20) being characterized by:
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a signal injection device (203) coupled to the cabling (205), with the signal injection device (203) being configured to generate an injection signal and communicate the injection signal into the cabling (205) and to the first and second pickoff sensors (201a, 201b); and a signal conditioning circuit (202) coupled to the cabling (205), with the signal conditioning circuit (202) being configured to receive at least one response signal from at least one of the first and second pickoff sensors (201a, 201b) in response to the injection signal and determine one or more of a pickoff open wire fault and a pickoff connection orientation fault in one or both of the one or more first pickoff wires and the one or more second pickoff wires of the cabling (205). - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting a cable fault in a cabling of a flow meter, the method being characterized by:
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in a meter electronics, comparing an injection signal component of a response signal received in the meter electronics from at least one of a first pickoff sensor and a second pickoff sensor to a predetermined pickoff amplitude threshold; and in the meter electronics, determining a pickoff open wire fault in a corresponding one or more first pickoff wires or in a corresponding one or more second pickoff wires if the injection signal component does not exceed the predetermined pickoff amplitude threshold. - View Dependent Claims (7, 8)
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9. A method for detecting a cable fault in a cabling of a flow meter, the method being characterized by:
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in a meter electronics, comparing a phase difference between a first pickoff response phase of a first pickoff response signal and a second pickoff response phase of a second pickoff response signal to a predetermined pickoff phase difference threshold, with the first pickoff response signal and the second pickoff response signal being received in the meter electronics from the first pickoff sensor and the second pickoff sensor via the cabling; and in the meter electronics, determining a pickoff connection orientation fault if the phase difference exceeds the predetermined pickoff phase difference threshold. - View Dependent Claims (10, 11)
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Specification