Pressure sensor diagnostics in a process transmitter

G - Physics – 01 – L

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G01L 27/00 (2006.01)

Patent

CA 2246613

A perturbation is inputted to a capacitance transducer. It can be illuminated by an LED, causing an increase in capacitance (fig. 4). The effect decreases with decreasing vacuum level. A step voltage can be applied to cause an effective pressure change. Ringing frequency, decay rate, amplitude are observed (fig. 5). The pressure output is accordingly compensated or an alarm is risen.

Une perturbation est appliquée à un transducteur capacitif. Ledit transducteur peut être illuminé par une DEL, ce qui entraîne une augmentation de la capacité (fig. 4). L'effet décroît avec la diminution du niveau de vide. Une tension en échelon peut être appliquée afin de provoquer une réelle modification de la pression. La fréquence, la vitesse de décroissance et l'amplitude d'une sonnerie sont observés (fig. 5). La pression de sortie est compensée en conséquence ou une alarme se déclenche.

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