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US 2009/0015236 A1Published application
Noise diagnosis of operating conditions for an electromagnetic flowmeter
AssigneeRosemount Inc.
InventorsScot R. Foss, Robert K. Schulz
Life of this patent
Estimating the term…
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.
Claims25
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.
2 more elements
A method of analysis of operating conditions for an electromagnetic flowmeter, comprising:
- 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.
2 more elements
A magnetic flowmeter, comprising:
- 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.
1 more element
Dependencies are inferred from the claim text.