Flow disturbance compensation for magnetic flowmeter
First Claim
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1. A transmitter for a magnetic flowmeter, the transmitter comprising:
- a current source for energizing the flowmeter, such that the flowmeter generates an induced electromotive force in response to a process flow;
memory for storing a non-conforming flow configuration, wherein the non-conforming flow configuration describes an actual flow pipe disturbance in the process flow, and wherein the flow pipe disturbance is located within five pipe diameters upstream or two pipe diameters downstream of the magnetic flowmeter, as installed in the process flow; and
a signal processor for determining a flow rate as a function of the induced electromotive force and the non-conforming flow configuration;
wherein the signal processor corrects the flow rate based on the flow pipe disturbance such that the magnetic flowmeter achieves a rated accuracy of one fifth percent to less than one half percent in the non-conforming flow configuration.
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Abstract
A transmitter for a magnetic flowmeter comprises a current source, memory and a signal processor. The current source energizes the flowmeter, such that the flowmeter generates an induced electromotive force in response to a process flow. The memory stores a flow configuration that describes a flow pipe disturbance in the process flow. The signal processor determines the flow rate as a function of the induced electromagnetic force, and as a further function of the flow configuration.
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Citations
19 Claims
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1. A transmitter for a magnetic flowmeter, the transmitter comprising:
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a current source for energizing the flowmeter, such that the flowmeter generates an induced electromotive force in response to a process flow; memory for storing a non-conforming flow configuration, wherein the non-conforming flow configuration describes an actual flow pipe disturbance in the process flow, and wherein the flow pipe disturbance is located within five pipe diameters upstream or two pipe diameters downstream of the magnetic flowmeter, as installed in the process flow; and a signal processor for determining a flow rate as a function of the induced electromotive force and the non-conforming flow configuration; wherein the signal processor corrects the flow rate based on the flow pipe disturbance such that the magnetic flowmeter achieves a rated accuracy of one fifth percent to less than one half percent in the non-conforming flow configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic flowmeter comprising:
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a pipe section; a coil proximate a radially outer boundary of the pipe section; a current source for energizing the coil to generate a magnetic field inside the pipe section; a probe extending through the pipe section to sense a Faraday voltage induced by process flow through magnetic field; a storage device for storing a non-conforming flow configuration representing an actual flow pipe disturbance in the process flow, wherein the flow pipe disturbance is located within five pipe diameters upstream or two pipe diameters downstream of the magnetic flowmeter, as installed in the process flow; and a processor to determine a rate of the process flow as a function of the Faraday voltage and the non-conforming flow configuration; where in the signal processor corrects the rate of the process flow based on the flow pipe disturbance such that the magnetic flowmeter achieves a rated accuracy of one fifth percent to less than one half percent in the non-conforming flow configuration. - View Dependent Claims (12, 13, 14)
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15. A method for measuring a flow rate, the method comprising:
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storing a non-conforming flow configuration describing an actual flow pipe disturbance in a process flow, wherein the flow pipe disturbance is located within five pipe diameters upstream or two pipe diameters downstream of a magnetic flowmeter, as installed in the process flow; generating a magnetic field across the process flow; sensing an electromotive force induced across the process flow by the magnetic field; and determining the flow rate as a function of the electromotive force and as a further function of the non-conforming flow configuration; and correcting the flow rate based on the flow pipe disturbance such that the magnetic flowmeter achieves a rated accuracy of one fifth percent to less than one half percent in the non-conforming flow configuration. - View Dependent Claims (16, 17, 18, 19)
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Specification