The vibrating wire displacement transducer used for Crackmeters consists of a vibrating wire sensing element anchored at one end and connected to a spring loaded rod at the other end. As the rod is moved out from the transducer body the spring is elongated causing an increase in the vibrating wire tension. This tension is directly proportional to the spring extension and therefore the joint opening or closing.

The Crackmeter is mounted across joints or cracks by installing a pair of anchor stems. Pre-positioned holes are drilled each side of the crack or joint. The Crackmeter is assembled onto the pair of anchors and extended to allow for the expected direction and magnitude of movement.

The groutable anchors are carefully pushed into the drill holes, which are pre-filled with grout or resin cement. Expanding shell anchors are carefully pushed into clean pre-drilled holes and expanded by tightening the anchor bolt.

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.
Connecting cable is strong, screened and flexible and can be used in lengths in excess of 1000m.
Waterproof and sealed to 7 bar pressure.
Crackmeters can be connected to a CR10X datalogger.
Crackmeters are available with ranges up to 100mm.

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