Resistance based process control device diagnostics
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United States of America Patent
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Sep 10, 2002
Issued Date -
N/A
app pub date -
Jul 14, 2000
filing date -
Nov 7, 1996
priority date (Note) -
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Abstract
A device in a process control system includes an electrical element which has a resistance. Self heating circuitry coupled to the element provides a self heating signal related to the resistance of the element. Diagnostic circuitry provides a diagnostic output as a function of the self heating signal output.
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