Compensated capacitive liquid level sensor

A uniform field compensated-type capacitive sensor for measuring the liquid level of a liquid having a dielectric constant inside a container, wherein said sensor is fixed to said container and comprises:

• first and second non-conductive substrates facing each other;
• at least three electrodes formed on said substrates and extending substantially from a lower level to a higher level, said lower level and said higher level bounding a desired measurement range, said at least three electrodes being configured to interact capacitively with said liquid constituting at least two sensing capacitors each with a capacitance which varies as a function of the liquid level within said desired measurement range, and wherein said functions that describe the dependence of said capacitances on said liquid level differ from each other;
• and
• signal processing means for converting said capacitances into electrical signals and processing said electrical signals to provide an output signal indicative of said liquid level relative to said sensor, wherein said output signal is substantially independent of the electrical properties of said liquid.