Capacitive liquid level sensor

F - Mech Eng,Light,Heat,Weapons – 04 – B

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F04B 49/02 (2006.01)

Patent

CA 2708225

Described herein is technology for, among other things, controlling a pump submersed in a liquid, where the pump includes a plurality of capacitive sensors. The capacitive sensors include a first capacitive sensor and a second capacitive sensor disposed above the first capacitive sensor. The technology involves sensing liquid levels with the capacitive sensors, activating the pump after the second capacitive sensor detects the liquid in a normal mode of operation, deactivating the pump after the first capacitive sensor no longer detects the liquid in the normal mode of operation, detecting a failure of one or more capacitive sensors, and adjusting the operation of the pump to compensate for the failure of the one or more capacitive sensors.

L'invention concerne une technique de commande, entre autres, d'une pompe immergée dans un liquide, la pompe comprenant une pluralité de capteurs capacitifs. Les capteurs capacitifs comprennent un premier capteur capacitif et un second capteur capacitif disposé au-dessus du premier capteur capacitif. La technique implique la détection de niveaux de liquide à l'aide des capteurs capacitifs; l'activation de la pompe une fois que le second capteur capacitif a détecté le liquide dans un mode de fonctionnement normal; la désactivation de la pompe une fois que le premier capteur capacitif ne détecte plus le liquide dans le mode de fonctionnement normal; la détection d'une panne de l'un ou de plusieurs des capteurs capacitifs; et le réglage du fonctionnement de la pompe pour compenser la panne de l'un ou de plusieurs des capteurs capacitifs.

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