Noise diagnosis of operating conditions for an electromagnetic flowmeter
First Claim
Patent Images
1. An analysis circuit for an electromagnetic flow tube and transmitter, comprising:
- a controller that provides diagnostic operating conditions of coil current amplitude and frequency for a coil of the flow tube;
an identification circuit that identifies one or more of the diagnostic operating conditions for which the coil current is stable during a sample interval;
a noise floor measurement circuit that measures a noise floor of a flow tube electrode voltage for the identified diagnostic operating conditions; and
a selection circuit that selects at least one of the diagnostic operating conditions as a measurement operating condition as a function of the noise floor measurements.
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Abstract
An analysis circuit in an electromagnetic flowmeter provides diagnostic operating conditions and identifies one or more of the diagnostic operating conditions for which the coil current is stable during a sample interval. A diagnostic operating condition is selected as a measurement operating condition as a function of a noise floor measurements of the electrode voltage.
24 Citations
25 Claims
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1. An analysis circuit for an electromagnetic flow tube and transmitter, comprising:
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a controller that provides diagnostic operating conditions of coil current amplitude and frequency for a coil of the flow tube; an identification circuit that identifies one or more of the diagnostic operating conditions for which the coil current is stable during a sample interval; a noise floor measurement circuit that measures a noise floor of a flow tube electrode voltage for the identified diagnostic operating conditions; and a selection circuit that selects at least one of the diagnostic operating conditions as a measurement operating condition as a function of the noise floor measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of analysis of operating conditions for an electromagnetic flowmeter, comprising:
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providing diagnostic operating conditions of coil current amplitude and frequency for a coil of the flow tube; identifying one or more of the diagnostic operating conditions for which the coil current is stable during a sample interval; measuring a noise floor of a flow tube electrode voltage for the identified diagnostic operating conditions; and selecting at least one of the diagnostic operating conditions as a measurement operating condition as a function of the noise floor measurements. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A magnetic flowmeter, comprising:
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an electromagnetic flow transmitter providing a coil current and measuring an electrode voltage; an electromagnetic flow tube have a coil receiving the coil current and having electrodes providing an electrode voltage; and an analysis circuit providing diagnostic operating conditions, identifying one or more of the diagnostic operating conditions for which the coil current is stable during a sample interval, and selecting at least one of the diagnostic operating conditions as a measurement operating condition as a function of a noise floor measurements of the electrode voltage. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification