System for measuring the level of filling

A system for measuring a level of fluid in a vessel particularly in a fuel tank, the system including an analog probe which extends within the vessel over a range of fluid level and supplies measurement signals of the fluid level;

• and wherein the system further comprises
• a digital probe disposed in said vessel for supplying measurement signals which can change rapidly in accordance with fluid level, the analog probe extending in the vessel over a range of fluid level at least as great as a range of fluid level extension of the digital probe to permit measurement of a predetermined fluid level by both of said probes;
• an electronic circuit means coupled to said probes for comparing signals of the respective probes to provide correction values derived from a comparison of the measurement signals of the digital probe and the analog probe, said electronic circuit noting when a level measurement by said digital probe falls within a window of level measurement by said analog probe;
• and wherein
• said circuit means corrects the measurement signals of the analog probe by means of the correction values for display of liquid level, a correction value being obtained from said digital probe for a level measurement falling within a window.