# US 2015/0378332 A1 · Hysteretic process variable sensor compensation

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- Number: US 2015/0378332 A1
- Document ID: US20150378332A1
- Status: Published application
- Kind: A1
- Application number: 14/319,063
- Filed: 2014-06-30
- Published: 2015-12-31
- Earliest claimed: 2014-06-30
- Assignees: Rosemount Inc.
- Applicants: Rosemount Inc.
- Inventors: Charles Ray Willcox
- Web page: https://patentgrep.com/patent/US20150378332A1

## CPC

- G05B 17/02: electric
- G01L 9/0072: {using variations in capacitance}
- G01L 19/02: Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means (for aneroid barometers G01L7/14)
- G05B 19/404: characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence)
- G05B 2219/31126: Transmitter coupled to fieldbus and to sensor, a-d conversion
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## 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.

## Claims

### Claim 1

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;
output circuitry configured to provide a process variable transmitter output related to the compensated sensed process variable.

### Claim 2 (depends on 1)

The process variable transmitter of claim 1 wherein the Hysteron basis function is implemented in an N-Hysteron model, where N is the number of Hysterons.

### Claim 3 (depends on 2)

The process variable transmitter of claim 2 wherein the N-Hysteron model comprises a plurality of Hysterons with configurable α and β thresholds.

### Claim 4 (depends on 2)

The process variable transmitter of claim 2 wherein the N-Hysteron model comprises a plurality of Hysterons each with a configurable weighting.

### Claim 5 (depends on 2)

The process variable transmitter of claim 2 wherein the N-Hysteron model is configured using an α-β matrix.

### Claim 6 (depends on 1)

The process variable transmitter of claim 1 wherein Hysteron basis functions are used to compensate for errors introduced in the sensed process variable due to hysteresis.

### Claim 7

The process variable transmitter of claim wherein Hysteron basis functions are used to compensate the sensed process variable through curve fitting.

### Claim 8 (depends on 1)

The process variable transmitter of claim 1 wherein the process variable sensor comprises a pressure sensor.

### Claim 9 (depends on 8)

The process variable transmitter of claim 8 wherein the pressure sensor includes a metal diaphragm.

### Claim 10 (depends on 9)

The process variable transmitter of claim 9 wherein the metal diaphragm has a free-edge configuration.

### Claim 11 (depends on 9)

The process variable transmitter of claim 9 wherein the metal diaphragm comprises a stretched membrane diaphragm.

### Claim 12 (depends on 1)

The process variable transmitter of claim 1 wherein the process variable sensor comprises a temperature sensor.

### Claim 13 (depends on 1)

The process variable transmitter of claim 1 wherein an output from the process variable sensor includes hysteresis introduced by components of the process variable sensor.

### Claim 14 (depends on 1)

The process variable transmitter of claim 1 wherein an output from the process variable sensor includes hysteresis introduced from a source external to the process variable sensor.

### Claim 15 (depends on 14)

The process variable transmitter of claim 14 wherein the source external to the process variable sensor comprises an isolation diaphragm.

### Claim 16 (depends on 14)

The process variable transmitter of claim 14 wherein the source external to the process variable sensor comprises an isolation bellows.

### Claim 17 (depends on 1)

The process variable transmitter of claim 1 wherein the Hysteron basis function model output is set to a mid-point value upon power up.

### Claim 18 (depends on 17)

The process variable transmitter of claim 17 wherein the mid-point value is a mid-point between hysteresis loop extremes.

### Claim 19 (depends on 17)

The process variable transmitter of claim 17 wherein the mid-point value is stored in a memory.

### Claim 20

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; and
providing an output related to the compensated sensed process variable.

### Claim 21 (depends on 20)

The method of claim 20 wherein the Hysteron basis functions are implemented in an N-Hysteron model, where N is the number of Hysterons.

### Claim 22 (depends on 21)

The method of claim 21 wherein the N-Hysteron model comprises a plurality of Hysterons with configurable α and β thresholds.

### Claim 23 (depends on 21)

The method of claim 21 wherein the N-Hysteron model comprises a plurality of Hysterons each with a configurable weighting.

### Claim 24 (depends on 21)

The method of claim 21 including configuring the N-Hysteron model using an α-β matrix.

### Claim 25 (depends on 20)

The method of claim 20 wherein Hysteron basis functions are used to compensate for errors introduced in the sensed process variable due to hysteresis.

### Claim 26 (depends on 20)

The method of claim 20 wherein Hysteron basis functions are used to compensate the sensed process variable through curve fitting.

### Claim 27 (depends on 20)

The method of claim 20 wherein an output from the process variable sensor includes hysteresis introduced by components of the process variable sensor.

### Claim 28 (depends on 20)

The method of claim 20 wherein an output from the process variable sensor includes hysteresis introduced from a source external to the process variable sensor.

### Claim 29 (depends on 20)

The method of claim 20 including setting the Hysteron basis function model output to a mid-point value upon power up.

### Claim 30 (depends on 29)

The method of claim 29 wherein the mid-point value is a mid-point between hysteresis looped extremes.

### Claim 31 (depends on 29)

The method of claim 29 including retrieving the mid-point value from a memory.