Wire Extensometer

Wire Extensometer

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Australia Tel: +61 (0)3 8720 6700
Indonesia Tel: +62 21 3040 4422
New Zealand Tel: +64 (0)7 850 2610
South Africa Tel: +27 (0)10 900 2055


The Model 4015 Wire Extensometer uses flexible stainless steel wire rope sheathed in polyethylene tubing with plated anchors. The assembly is grouted into a borehole and a head frame with transducers is fitted. For large displacements, a spring loaded head frame is recommended (consists of up 6 spring loaded sensors). The unit can be read from a remote site data logger or read at the collar using Model 9600-2 10-channel extensometer readout.


Measurement of settlements, displacements and deformation in:

  • Tunnelling
  • Open cut mines
  • Dam construction
  • Underground mines
  • Large excavations
  • Construction control


  • Complete instruments supplied ready for installation
  • One to six anchor positions for varying ground conditions
  • Compact design, for ease of transportation
  • Transverse shear accommodation
  • The head frame can be re-used on subsequent boreholes
  • Three options for obtaining data including digital counter, hand held readout and data logger


  • Sensor ranges: 0-1 m, 0-2 m, 0-3 m
  • Resolution: 0.1 mm
  • Maximum number of sensors: 6
  • Nominal borehole diameter:100mm
  • Maximum borehole length: 150m
  • Measurement options: Digital counter, Handheld readout data logger
  • Dimension (head assembly): 300mm x 300mm x 150mm
  • Dimension (anchor): 60mm, expands up to 250mm