Auto correcting temperature transmitter with resistance based sensor
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United States of America Patent
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Feb 11, 2003
Issued Date -
N/A
app pub date -
Oct 19, 1998
filing date -
Nov 7, 1996
priority date (Note) -
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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.
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