The Centering Device ZS is used to measure the horizontal displacement along an inverted or direct plumb line borehole related to the plumb wire.
For the measurement the centering probe which is fixed at a measuring tape is lowered into the plumb line tube by means of a winch. At the desired measuring depths, the centering probe is stopped. At each measuring point the plumb wire is exactly centered in the middle of the piping.At these positions the measurement can be done manually with a coordiscope KK84x or automatically with a telependulum VDD2xx.
Optionally the Z-displacement (vertical) can be measured between the anchor and the upper end of the plumb line tube by using a second wire (Invar). The measurement can be done manually with a setdeflectometer at the tension device of the Z wire.