A liquid level sensor that provides digital signal processing for transforming a magnetic field into a continuous linear output signal that corresponds to the level of liquid within a vessel that is being monitored. The invention uses 3D field sensors for decompensating unwanted interference caused by electric drives or the earth's magnetic field or other magnetic fields caused wires or magnets. The sensor can also be combined with 3D accelerometer to optimize compensation of unwanted interference. The accelerometer always provides the center of the earth so that an angle of deflection of the liquid versus the horizontal can be determined and correct any faulty measured value of the liquid level. The invention is highly robust yet is low cost to manufacture.

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