VWCM-4000 crack meters are used to measure movement across surface cracks and joints in concrete, rock, soil and structures. They consist of a sensor outer body tube and an inner free-sliding rod which is connected at the internal end to a vibrating wire sensor by a spring. At the sensor end of the outer body and the external end of the rod anchors are attached which can be fixed either side of a crack to be monitored. A change in distance between the anchors caused by the crack opening or closing causes the inner free-sliding rod to move within the outer body which changes the tension on the spring and the vibrating wire thus altering the resonant frequency of the wire. VWCM-4000 crack meters are installed by grouting, bolting, bonding or fixing expandable anchors to the structure to be monitored.
Ranges: 5, 12.5, 25, 50, 100, 150, 200, 300mm
Resolution: <0.025% FS
Accuracy: ±0.1 to ±0.5% FS
Non-linearity: <0.5% FS
Frequency: 2200 - 3500 Hz
Waterproof rating: 16 bar

Geosense Ltd
Nova House
Rougham Industrial Estate
Rougham, Bury St Edumunds
Suffolk IP30 9ND
ENGLAND
T +44 (0)1359 270457
F +44 (0)1359 272860
info@geosense.co.uk