Displacement sensors are used for non-contacting measurement of relative shaft vibration, relative shaft position (axial/radial position), eccentricity (shaft excursion), relative shaft expansion, rod-drop displacement, reference signals for speed and phase angle, rotational direction and zero speed.The non-contacting displacement sensors are distinguished in terms of their basic construction. The DS series with sealed ceramic sensor tip and IP 68 protection class; conventional structure with sensor, calibrated cable and external oscillator. SD series consisting of sensor, calibrated cable and external oscillator. Series with an integrated oscillator (type IN-).