The pick-up sensors are characterised by extreme long life due to their non-contacting and therefore almost wearfree mode of operation. Measurements are carried out by scanning a gear-tooth or pulse wheel. The speed sensor is placed at a particular distance above the wheel.
Pick-up sensors use the Hall effect to capture driving speed. Rotational direction can also be determined. Two Hall elements are arranged in a relative geometrical position to one another within the pick-up sensor so that both revolutions and rotational direction can be determined. The output levels of both receivable signals, galvanically separated from each other, are processed for a wide range of supply voltages.