The extensometer is designed to measure the distance variations between anchors placed at a defined depth and a measuring head located on the surface.

logo-trust-techA sensor for measuring settlements and heave

Rods connect each anchor to the head, where measurements are taken with a depth gauge or displacement sensors.


The extensometer head is adapted according to the measurement range, up to 100 mm (3.9") or 200 mm (7.9"), the number of anchors (points) to be measured, and the type of rod used.

 

The extensometer rods are available in fiberglass or stainless steel.

Each type is inserted in a nylon sheath that prevents friction between the soil/cement and the rod.

Measurements can be made manually with a depth gauge or remotely with vibrating
wire or 4-20mA displacement transducers, connected to a recorder or a portable
reading station.

image background

Talk to our experts

Arnaud DE PRACOMTAL

Director SOCOTEC Monitoring France - Director Infrastructure & Middle East Africa

Director SOCOTEC Monitoring France - Director Infrastructure & Middle East Africa

Arnaud.DEPRACOMTAL@socotec.com
image background

Applications

EXTENSOMETER® : multipoint extensometer sensor for drilling

socotec-extensometre-geotechnique

The multipoint extensometer sensor in drilling allows to monitor :

  • Tunnels
  • Excavations
  • Dams
  • Foundations
  • Settlement and rock displacement measurements

The multipoint extensometer sensor in drilling allows to monitor :

  • Tunnels
  • Excavations
  • Dams
  • Foundations
  • Settlement and rock displacement measurements

FEATURES 

Extensometer®

SENSOR

Technology 

Potentiometric

Output signal

4-20 mA

4-20 mA

30 mm, 50 mm, 100 mm, mm200

Accuracy

0.2% of full scale

Resolution

± 0.025% of full scale

Operating temperature 

From -20°C to + 80°C

Presence of thermistor 

NTC 3k Ω

Thermistor accuracy 

± 0,5°C

Resolution of the thermistor

0,1°C

Excitation method 

Pulse or scan

Materials

Stainless steel
ABS
PVC

Protection class

IP68 at kPa1700

Need to measure the distance variations between anchors?

image background

Talk to our experts

Arnaud DE PRACOMTAL

Director SOCOTEC Monitoring France - Director Infrastructure & Middle East Africa

Director SOCOTEC Monitoring France - Director Infrastructure & Middle East Africa

Arnaud.DEPRACOMTAL@socotec.com