Patent ID: 8181516

Claim:
A process for measuring a liquid level in a tank that consists in: positioning, in the tank, two reference capacitors that are substantially identical and two measurement capacitors that are also substantially identical in such a way that, when the tank is full, the 4 capacitors are submerged and that, when the liquid level in the tank falls, a measurement capacitor/reference capacitor pair (Cmeas 2 , Cref 2 ) emerges before another pair of capacitors (Cmeas 1 , Cref 1 ); when the 4 capacitors Cmeas 1 , Cref 1 , Cmeas 2 , Cref 2 are in air, measuring the 4 capacitors in air; and when at least one capacitor is at least partly immersed in the liquid, measuring the value of said capacitor, measuring the values of the other capacitors and calculating the liquid level in the tank from the measured value of the capacitor partly immersed in the liquid, the value in air measured previously of the capacitor partly immersed in the liquid and the measured values of the other capacitors.