The pick-up sensors are characterized 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 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 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.