Open sensor diagnostic system for temperature transmitter in...

G - Physics – 01 – K

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G01K 15/00 (2006.01) G01K 7/02 (2006.01) G05B 9/02 (2006.01)

Patent

CA 2222681

A temperature transmitter (10) in a process control system includes a temperature sensor (16, 18) which senses temperature and provides a sensor output related to sensed temperature. An analog-to-digital converter (28) coupled to the sensor output provides a digitized output related to the sensor output. A microprocessor (22) receives the digitized output, compensates the digitized output and provides a temperature output. Comparison circuitry (12) compares the sensor output to a first threshold VREF1 and provides an inhibit signal to the microprocessor (22) if the sensor is outside of the first threshold VREF1.

Transmetteur (10) de température dans un système de commande de processus, comportant un capteur de température (16, 18) qui détecte la température et fournit un signal de sortie de capteur associé à la température détectée. Un convertisseur (28) analogique/numérique couplé à la sortie de capteur fournit une valeur de sortie numérisée associée au signal de sortie du capteur. Un microprocesseur (22) reçoit la valeur de sortie numérisée, compense ladite valeur et fournit une valeur de température. Un circuit de comparaison (12) compare la valeur de sortie du capteur à une première valeur de seuil V¿REF1? et transmet un signal d'inhibition au microprocesseur (22) si le capteur se trouve en dehors de la première valeur de seuil V¿REF1?.

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