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US 2015/0177035 A1Published application
Magnetic flowmeter with automatic operating setpoint selection
AssigneeRosemount Inc.
InventorsBruce D. Rovner, Scot Ronald Foss, Steven B. Rogers
Life of this patent
Estimating the term…
Abstract
A magnetic flowmeter includes a flowtube with electrodes and field coil and a transmitter that automatically determines an operating setpoint for the magnetic flowmeter based upon sensed coil inductance, sensed coil resistance, a power rating for the transmitter, the flowtube, or both, and selected performance criteria.
Claims28
A magnetic flowmeter comprising:
- a flowtube that includes:
- a pipe through which fluid flows;
- a field coil mounted on the pipe;
- and
- electrodes for sensing voltage induced by a magnetic field generated by the field coil in the fluid that flows through the tube;
- and
- a transmitter that includes:
- a coil driver for exciting the field coil;
- and
- a processor for producing a flow measurement value as a function of the voltage sensed by the electrodes, and for controlling operation of the coil driver according to an operating setpoint determined by the processor based upon flowmeter parameters including coil resistance, coil inductance, a power rating, and a performance criteria selection.
7 more elements
A magnetic flowmeter comprising:
- a flowtube having a coil for producing an alternating magnetic field and electrodes for sensing voltage induced by the magnetic field in fluid flowing through the tube;
- a coil driver connected to the coil to produce the alternating magnetic field at a coil drive frequency and at a current setpoint, the coil driver including circuitry for sensing coil current;
- and
- a processor that generates a flow output as a function of a sensed voltage between the electrodes, wherein the processor controls the coil driver based on a coil resistance value, a coil inductance value, a power rating, and a performance criteria selection.
1 more element
A transmitter for use with a magnetic flowtube, the transmitter comprising:
- a coil driver for supplying a current to a coil of the magnetic flowtube;
- and
- a processor for determining an operating setpoint based on coil resistance, coil inductance, a power rating, and a performance criteria selection;
- and
- controlling operation of the coil driver based on the operating setpoint.
2 more elements
A method of controlling operation of a magnetic flowmeter, the method comprising:
- obtaining flowmeter parameters including coil resistance, coil inductance, and a power rating;
- obtaining a performance criteria selection;
- determining an operating setpoint that includes current and frequency setpoint values based upon the flowmeter parameters and the performance criteria selection;
- and
- controlling field coil excitation of the magnetic flowmeter based on the operating setpoint.
2 more elements
Dependencies are inferred from the claim text.