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Apparatus for measuring level and quantity of fuel oil stored in a tank, which comprises a pair of electrodes, one being a number of segmented electrodes while the other is an elongated electrode to form a number of capacitors, a source for applying high frequency voltage to said electrodes one by o

Apparatus for measuring level and quantity of fuel oil stored in a tank, which comprises a pair of electrodes, one being a number of segmented electrodes while the other is an elongated electrode to form a number of capacitors, a source for applying high frequency voltage to said electrodes one by one to generate electric signals, means for converting said signals to corresponding high frequency signals, means for computing height of said liquid level from frequencies of signals, and means for computing the fuel quantity. Said capacitor probe is prepared by fastening an elongated flexible substrate IS printed with said electrodes round a rigid bar S, covering the outer surface thereof with insulative material, and fitting a metallic tube. Said segmented electrodes are arranged lengthwise in two rows in zig-zagged and partly overlapped.

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Apparatus for measuring the level and amount of at least one liquid in a tank comprising an electrode probe having a pair of electrode means, one of said electrode means comprising two rows of spaced segmented electrodes with the segmented electrodes in one row being longitudinally offset relative t

Apparatus for measuring the level and amount of at least one liquid in a tank comprising an electrode probe having a pair of electrode means, one of said electrode means comprising two rows of spaced segmented electrodes with the segmented electrodes in one row being longitudinally offset relative to the segmented electrodes in the other row to provide an overlapping relationship between the segmented electrodes in the two rows, the other of said electrode means comprising an elongated electrode disposed in opposing relationship to said segmented electrodes to form a corresponding number of capacitors, means for supplying a voltage of high frequency to said segmented electrodes and said elongated electrode to generate electrical signals corresponding to the electrostatic capacity of each of said capacitors, converting means for converting said electrostatic capacity into a frequency signal, comparing means for comparing the signal frequency of said capacitors formed by said segmented electrodes to thereby detect where the liquid level lies on the segmented electrodes, and calculating means for calculating the quantity of liquid in said tank based on said detected liquid level.