​Electrolevel Beam Sensors detect differential movement and rotation in structures. Two versions of the beam sensor are available: horizontal for monitoring settlement or heave and vertical for monitoring lateral displacement and convergence.

The Electrolevel Beam Sensor measures rotation of structures in the vertical plane. The sensor is based on the well established Fredericks 0711 series electrolevel sensor. The sensor mounting incorporates an adjustment for zeroing and protects the sensor against thermal gradients.

The sensor is attached to a rigid beam for installation and various beam lengths are available. Both ends of the beam are fixed using anchor bolts. When multiple beams are placed end to end, a differential displacement profile of the structure from anchor point to anchor point can be derived.

Product Features

  • Multiple beams in a chain give a complete displacement profile
  • Simple, well proven device, ideal for measuring tilt in structures
  • Accurate and precise
  • Measures tilt along the whole length of a beam
  • Measures vertical rotation

Product Benefits

  • Easy to automate using data acquisition systems and Argus software
  • Removes the need for manual monitoring
  • Recoverable and reusable
  • Suitable for safety critical applications
  • Low power consumption


The Electrolevel Beam sensor consists of a precision glass electrolevel vial mounted in an inert ceramic compound which is itself placed in an adjustable mount. Once installed, thumbwheels at one end allow the sensor to be adjusted to the zero position using a handheld readout.

The beam is attached to the structure using either expanding shell or groutable anchors.


The Electrolevel Beam sensor monitors vertical rotations of structures. Its most common use is to monitor settlement and heave of existing structures and tunnels caused by adjacent excavations or tunnelling works. The sensor is especially useful where topographic measurements are precluded, or where access is restricted.

Typical monitoring applications include:

  • Brick and stone buildings
  • Heave and settlement due to adjacent construction activities
  • Bridges and dams Impounding and loading effects in the short or long term
  • Pipelines
  • Differential levels
  • Tunnels
  • Vertical rotation and track deformation.

Geomotion offer installation and monitoring services to support this system. For more information please email info@geomotion.com.au or contact any of our locations.