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Vibrating Wire Soil Extensometer

The Vibrating Wire Soil Extensometer measures lateral deformation of soil and rock, particularly in embankment dams and quarry or mining excavations.

A chain of successive displacement transducers and anchor beams may be employed to provide a continuous profile of movement. The Extensometer consists of a Vibrating Wire displacement transducer contained within a heavy-duty sealed housing.

A telescoping PVC sleeve protects the extension rod from soil contact, ensuring its free movement.

As lateral movement occurs, the distance between the VW transducer and the anchor is changed. This causes a change of frequency in the VW transducer; the change is measured and can be converted to give the displacement in millimetres.


The measure of soil and rock movements including:

  • Horozontal and vertical displacments within embankments fill material
  • Displacements of retaining walls and abutments
  • Foundation spreading
  • Control of natural and cut slopes, quarry and mining excavations


  • Accurate, robust and very good long-term stability
  • Heavy duty steel housing suitable for burial in rock-fill
  • Suitable for remote reading
  • Over-voltage surge arrestor fitted to protect against electrical damage
  • Connecting cable is strong, flexible, armoured and can be used in lengths in excess of 1000m
  • Waterproof and sealed to 1000kPa

Ordering information

E7-1.10 Vibrating wire soil extensometer, 300mm range with thermistor, supplied with 1m cable only

Other options available please see specification sheet