Auto correcting temperature transmitter with resistance based sensor
US6519546B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1998 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Oct 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C19/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transmitter in a process control system includes a resistance-based sensor sensing a process variable and providing a sensor output. Self heating circuitry coupled to the sensor provides a self heating signal related to the sensor. Analog-to-digital conversion circuitry coupled to the sensor output provides a digitized sensor output, and transmitter output diagnostic correction circuitry provides an auto corrected output as a function of the self heating signal output or in another embodiment, the transmitter outputs a residual life estimate of the sensor as a function of the self heating index. A novel method of calculating the self heating index is also disclosed, which is applicable to various methods for providing a diagnostic transmitter output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.