DEVICE FOR CONTACTLESS MEASUREMENT OF A LEVEL IN A TANK

摘要

A measuring device that measures the level of fluid in a tank, for example a level of an aqueous urea solution in a tank for catalytic converters of combustion engines. The measuring means include: at least one sensor including a capacitive element electrically coupled to an oscillator configured to deliver a signal Si whose frequency FiPAD is a function of the capacitance of the capacitive element; at least one sensor being intended to be disposed outside of the tank, so that the capacitance of the capacitive element varies based on the level n of the fluid, when the level is comprised between a first threshold hi-min and a second threshold hi-max; a processing module, coupled to at least one sensor, and configured to determine the level n of fluid in the tank based on the frequency of the signal Si.

主权项

1. A measuring device intended to cooperate with a tank capable of containing a fluid, said device being adapted to determine a level (n) of the fluid, along a vertical axis (NM) of said tank, wherein it includes:
at least one sensor including a capacitive element electrically coupled to an oscillator configured to deliver a signal (Si) whose frequency (FiPAD) is a function of the capacitance of the capacitive element; said at least one sensor being intended to be disposed outside of the tank, so that the capacitance of the capacitive element varies based on the level (n) of the fluid, when said level is comprised between a first threshold (hi-min) and a second threshold (hi-max); a processing module, coupled to said at least one sensor, and configured to determine the level (n) of fluid in the tank based on the frequency of the signal (Si).