​Electrolevel and Solid State (MEMS) Sensors offer an inexpensive and simple method for monitoring rotation in structures.

The Electrolevel Tilt Sensor is based on a proven Fredericks 0711 series electrolevel sensor and measures rotation of structures in the vertical plane. The sensor is housed in a sealed enclosure incorporating an adjustable mounting plate. The measurement of vertical rotation perpendicular to the structure is obtained by using an optional 90 degree angle bracket.

The sensor mounting incorporates an adjustment for zeroing and protects the sensor against thermal gradients.

Product Features

  • Simple, well proven device, ideal for measuring tilt in structures
  • Accurate and precise
  • Measures vertical rotation

Product Benefits

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


The Electrolevel Tilt sensor consists of a precision glass electrolevel vial mounted in an inert ceramic compound which is itself placed in an adjustable mount.

The sensor is fixed to the structure. Once installed, thumbwheels at one end allow the sensor to be adjusted to the zero position using a handheld readout.


The Electrolevel Tilt 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
  • Vertical rotation (heave and settlement) due to adjacent construction activities
  • Bridges and dams
  • Impounding and loading effects in short or long term
  • Differential levels
  • Tunnels
  • Monitoring vertical rotation and track formation.

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.

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