Abstract: A sensor device for a noncontact sensor for the control of moving strips of conductive material. One or more detector electrodes are capacitively coupled to a counterelement. An oscillator governs this coupling and forms two coupling fields at the two edges of the strip. Lateral movement of the strip interacts with the two coupling fields. The at least one detector electrode is embraced by at least one shielding electrode, the shielding electrode being coupled through an amplifier of unity gain factor in such a manner to the at least one detector electrode that the potential of the at least one shielding electrode follows the potential of the detector electrode.