Electronics Black Wrist Watch
Electronics Black Wrist Watch

ERI Fill Extensometer

Category: Geotechnical & Civil Engineering Instrumentats

CONTINUOUS AND ACCURATE MEASUREMENT

RESISTANT TO SHOCKS AND VIBRATIONS

WIDE MEASURING RANGE

The ERI is a telescopic extensometer used to measure longitudinal displacements and axial deformations over long base lengths.

 

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The fill extensometer Model ERI consists of a telescopic outer PVC pipe fitted with two end flanges and an inner stainless steel rod. One end of the rod is attached to a flange, while the other end of the rod is attached to a displacement sensor, which is attached to the other flange. A signal cable attached to the sensor links the sensor to a readout at the surface. As displacement occurs, the telescoping outer pipe moves with the soil, causing the rod to compress or extend the displacement sensor.

 

These fill extensometers are generally installed horizontally in trenches, but sometimes vertically in boreholes. The standard lengths of the fill extensometer Model ERI are between 3 meters and 6 meters. Extensometers can be assembled in series using threaded rods inserted in the holes on each.

 

Specifications

 

  Range                                                                                                                 25, 100, 150, 200 and 300 mm
  Sensor type   Vibrating wire
  Accuracy   ±0.25% F.S.
  Resolution   0.02% F.S. (MB-3TL)
  Cable   IRC-41A(P), IRC-390
  Thermistor (optional)   3kΩ
  Operating temperature   −20 to +80°C
  Base length   3m (longer upon request)

 

 

  Outside diamete                            
  Stainless steel extension rod   6.35 mm
  End flange   150 mm
  PVC telescoping coupling   42 mm
  PVC sensor housing   48 mm
  PVC casing   33 mm
  Readout unit   MB-3TL
  Data acquisition system   SENSLOG

 


Ordering Info

 

Please specify:

  •     Base length and range
  •     Electrical cable length

 

 Optional accessories:

  •     1m rod and tube Readout instruments
  •     Readout instruments