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The Model 4020 Deep Hole Extensometer system uses stainless steel high tensile wires connected to spring anchors mechanically placed in the borehole (borehole not grouted). At the collar, these wires are connected to spring loaded sensors in a head frame. This provides a physical means of measuring the displacement in the zone between workings and surface displacements. Displacement ranges available are 1m, 2m and 3m. Up to 20 anchors can be placed in one hole. Read using Model 9600-2 readout or log using datalogger.
Measurement of settlements, subsidence, displacements and deformation in: