BRS Magnet Extensometers
BRS Magnet Extensometers
BRS Magnet Extensometers


  • A system – based on British Building Research technique – for measuring either settlement or heave at various depths in soil, embankments, earthfill dams and dikes.
  • Sisgeo BRS Magnet Extensometers consists of access tube with external corrugate pipe, magnet rings, telescopic bottom section with datum ring and suspension head.
  • Magnet rings (targets) are fixed, externally to the access tube, in the ground where movement may occur.
  • Magnet rings move together with surrounding soil along the axis of the access tube.
  • Readings are obtained with a portable readout, lowering the reed switch probe through the access tube.
  • Comparison of surveys taken over time provide profiles of ground settlement or heave.
APPLICATIONS Earthfill dams, Embankments, Retaining structures, such as sheet piles and slurry walls, Tunnels and shafts, Excavations, Foundations
FEATURES Simple and cheap system to measure vertical displacements, Available special targets for inclino-settlement column, Access tube and corrugate pipe can be extended during embankment construction, Magnetic detector probe is available with various tape lengths



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