A capacitive measuring instrument for water level...

G - Physics – 01 – F

Patent

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G01F 23/26 (2006.01)

Patent

CA 2314700

A capacitive sensor for water level measurement in an oil tank is sensitive to all kinds of parasitic capacitances up to an input capacitance of a measuring instrument. In a "one port measurement" with "active guard" said parasitic capacitance of the input of a measuring instrument can be prevented by using "charge/discharge" as the measuring method and to have the measurement of the amount of charge that flows thereby take place by means of a charge-controlled oscillator. The output frequency of the charge-controlled oscillator is a measure for the amount of charge that has flown through, and that in turn is a measure for the capacitance of the sensor, which in turn is a measure for the height of the water at the bottom of the oil tank.

Capteur capacitif pour la mesure du niveau d'eau dans un réservoir d'huile; ce capteur est sensible à toutes sortes de capacitances parasitiques, jusqu'à la capacitance de signal d'entrée d'un instrument de mesure. Dans une " mesure monoporte" avec " protection active", ladite capacitance parasitique du signal d'entrée d'un instrument de mesure peut être empêchée au moyen d'une "charge/décharge" en tant que méthode de mesure et en procédant donc à la mesure de la quantité de charge qui circule au moyen d'un oscillateur à charge contrôlée. La fréquence du signal de sortie de l'oscillateur à charge contrôlée est une mesure de la charge qui a traversé l'oscillateur et qui, à son tour, constitue une mesure de la capacitance du capteur, cette dernière constituant une mesure de la hauteur du niveau d'eau se trouvant dans le réservoir d'huile.

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