Cracmeters and jointmeters are utilized to monitor movements across surface cracks and joints in concrete structures or rock. The instrument assembly includes a sensor housing and target. Both parts are equipped with screw anchors.

Typically, the anchors are bolted on the opposite sides of the joint (crack). The displacement transducer housed in the sensor body is positioned across the joint/crack which enables measurement of the changes in the distance between the anchors.

CRID is an integrated system for fissure monitoring of building and monuments, which reduces the visual impacr. CRID includes four miniature fissure meters (sensors) connected by signal cable to a compact, battery-powered datalogger for automatic data acquisition.

Technical specifications

LINEAR POTENTIOMETER TRANSDUCERS
Full scales    10, 25, 50, 100, 150 mm
Resolution    0.01mm (dependent of readout)
Total accuracy    ±0.3% FS including linearity and hysteresis
Signal output    4-20 mA (current loop)
Power supply     12-24 V DC
Operating temperature    -20C +60C
Sensor diameter    16 mm
Anchor distance    500 mm
Environmental    IP68 (watertight up to 100 kPa)
Material    Stainless steel

VIBRATING WIRE TRANSDUCERS
Full scales    10, 25, 50, 100, 150 mm
Resolution     0.01mm (dependent from readout)
Total accuracy    ˂0.5% FS
Including linearity and hysteresis
Signal output    frequency
Operating temperature     -20C +80C
Sensor diameter    16 mm
Anchor distance    Max 500 mm
Environmental     IP68 (watertight up to 100 kPa)
Material     Stainless steel.