Hysteretic process variable sensor compensation
AssigneeRosemount Inc.
InventorCharles Ray Willcox
Life of this patent
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Abstract
A process variable transmitter for sensing a process variable of an industrial process includes a process variable sensor configured to sense a current process variable of the industrial process. Measurement circuitry is configured to compensate the sensed process variable as a function of at least one previously sensed process variable characterized by a Hysteron basis function model. Output circuitry provides a transmitter output related to the compensated sensed process variable.
Claims29
A process variable transmitter for sensing a process variable of an industrial process, comprising:
- a process variable sensor configured to sense a current process variable of the industrial process;
- measurement circuitry configured to compensate the sensed current process variable as a function of at least one previously sensed process characterized using Hysteron basis functions;
- and
- output circuitry configured to provide a process variable transmitter output related to the compensated sensed process variable;
- wherein the Hysteron basis functions are each set to initial values that are between hysteresis loop extremes upon power up.
A method of compensating a process variable output from a process variable sensor in an industrial process, comprising:
- sensing a current process variable of the industrial process using the process variable sensor;
- compensating the sensed current process variable as a function of at least one previously sensed process variable characterized by Hysteron basis functions;
- providing an output related to the compensated sensed process variable;
- and
- setting each of the Hysteron basis functions to initial values that are between hysteresis loop extremes upon power up.
Dependencies are inferred from the claim text.