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. 

Soil Instruments
Bell Lane
Uckfield
East Sussex
TN22 1QL
United Kingdom
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