Measuring rod for determining position of piston of hydraulic cylinder for roof support system in underground mines, has multiple detector elements, which are arranged along axis of measuring rod, and are formed by Hall sensors

摘要

The measuring rod (15) has multiple detector elements (21), which are arranged along an axis of the measuring rod. The detector elements are electrically interconnected with one another. The detector elements approach on a magnetic field of magnets. The detector elements are formed by Hall sensors. The detector elements emit positioning signals, where a reading device (27) is provided for reading out the respective position signal. A calibration device (29) is provided, in which linearization of the respective detector elements is stored.