Auto correcting temperature transmitter with resistance...

G - Physics – 01 – K

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G01K 15/00 (2006.01)

Patent

CA 2346095

A transmitter (40) in a process control system (2) includes a resistance-based sensor (10) sensing a process variable and providing a sensor output. Self heating circuitry coupled to the sensor (10) provides a self heating signal related to the sensor (10). Analog-to-digital conversion circuitry (50) coupled to the sensor output provides a digitized sensor output, and transmitter output diagnostic correction circuitry (52) provides an auto corrected output as a function of the self heating signal output or in another embodiment, the transmitter (40) outputs a residual life estimate of the sensor (10) as a function of the self heating index.

L'invention concerne un transmetteur (40) dans un système (2) de gestion de processus. Ce transmetteur comprend un capteur (10) à résistance qui détecte une variable du processus et fournit une sortie. Des circuits d'auto-chauffage couplés au capteur (10) émettent un signal d'auto-chauffage associé au capteur (10). Des circuits (50) de conversion A/N couplés au capteur fournissent une sortie de capteur numérisée et des circuits (52) de correction de diagnostic de sortie de l'émetteur fournissent une sortie corrigée qui est une fonction de la sortie du signal d'auto-chauffage. Dans une autre forme d'exécution, l'émetteur (40) sort une estimation de vie résiduelle pour le capteur (10) cette estimation étant une fonction de l'indice d'auto-chauffage.

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