Device for contactless measurement of a level in a tank

A measuring device configured to cooperate with a tank containing a fluid, said measuring device being adapted to determine a level (n) of the fluid, along a vertical axis (NM) of said tank, wherein the measuring device 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 disposed outside 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);
• the sensor being configured to be contactless with the tank and the fluid;
• 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);
• and
• a diagnosis module configured:
• (i) when the fluid level (n) determined by the processing module is lower than the first threshold (hi-min), to identify a dysfunction if a difference between the frequency (FiPAD) of the signal (Si) and a first reference frequency is substantially non-zero;
• (ii) when the fluid level (n) determined by the processing module is higher than the second threshold (hi-max), to identify a dysfunction if a difference between the frequency (FiPAD) of the signal (Si) and a second reference is substantially non-zero.