SISGEO

Wire Crackmeters

InfrastructureGeotechnical Instrumentation

The wire crackmeter, also known as a wire extensometer, is designed to monitor the changes in the distance between two anchor points located up to 30 m apart. The wire crackmeter consists of a transducer, an opposing anchor, and a wire that runs between the transducer and the opposing anchor. The transducer is housed in a stainless steel enclosure and supplied with a mounting plate. The opposing anchor is an eyebolt expansion bolt. The wire is stainless steel and supplied with clip. More info.↗

Quantity

Specification

Technology	rotative potentiometer and thermistor
Mechanical range	2000 mm (6.5")
Electrical range	240 mm (9.5") per complete rotation
Sensitivity	0.03 mm
Accuracy	± 1 mm (depends mainly on the thermal effect on the steel wire)
Repeatability	± 0.03 mm
Signal output	4-20 mA (current loop) for displacement, resistance for thermistor
Power supply	12-24 V DC
Wire	stainless steel, Ø 2 mm
Maximum wire tension	8 kg
Maximum wire length	up to 30 m with wire extension kit (distance between transducer and anchor target)
Operating temperature	-20°C +60°C
Housing size and protection	380 x 270 x 160 mm (15 x 11 x 6.5"), IP65
Anchors	No. 4 SL M 8 expansion bolts (Ø 14 mm) for transducer housing No.1 SL M 8 expansion eyebolt (Ø 14 mm) for opposing anchor
Material	stainless steel