The vibrating Wire Soil Extensometer consists of a vibrating wire displacement transducer in a sealed housing. The transducer comprises of a vibrating wire sensing element anchored at one end and connected to a spring loaded displacement rod at the other end.

As the push rod is moved out from the housing the spring is elongated causing an increase in the vibrating wire tension (either compression or tensile strain can be measured). This tension is directly proportional to movement of the displacement rod. The mode of operation is by plucking non-sustained oscillation of the vibrating wire. The wire, vibrating at its natural frequency, which is relative to the tension of the wire, induces an alternating current in a coil, which is detected by the readout/logger. Readings are made by measuring the elapsed time for 100 cycles and displayed in engineering units.

Accurate, robust and very good long term stability.
Accuracy unaffected by cable length.
Suitable for remote reading and data logging.
Over voltage surge arrestor fitted to protect against electrical damage.
VConnecting cable is strong, flexible, armoured or screened and can be used in lengths in excess of 1000m.
Waterproof and sealed to 10bar pressure.

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