Digital Liquid Level Settlement Monitoring System

This is high sensitivity liquid level settlement system is designed for remote measurement of minute differential settlement in tunnels, bridges and buildings, etc. with high precision. It consists of a low pressure, high sensitivity settlement sensors with digital output, connected in series to a reference reservoir and desiccant unit via fluid filled and air vent tubes respectively.


All interconnected settlement sensors are mounted at same elevation. They are connected in series by a fluid filled tube to a reference sensor mounted on stable ground, at same elevation. The settlement sensors and the reference sensor have a common fluid level initially. The fluid level in the reference reservoir is maintained almost constant. Settlement or heave of any sensor installed at settlement locations, causes difference in elevation between the sensor and reference reservoir, resulting in change in liquid head, which is read by the settlement transducer.

The settlement sensors are interconnected with an air vent tube terminated in a desiccant unit with a moisture trap. The common vent line being open to atmosphere results in settlement reading not being affected by local air current and changes in atmospheric pressure.

Data for remote online monitoring is retrieved from the sensors by a digital datalogger. With real-time data, authorities can monitor slightest changes taking place instantly. This allows taking of timely decisions resulting in increased safety, cost effectiveness and reduced project delays.

Range 1000 mm; can be calibrated to 500 mm
Sensor resolution 0.01 mm
Sensor accuracy Better than ± 0.4 mm
Output signal SDI-12 serial interface or Modbus (RS-485)
Temperature limit -20° to 80°C
Protection IP-67
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Equipment Rental

GDS has a variety of instruments for hire, these Instruments, Readouts and Dataloggers are available for product hire on a short-term (fortnightly) or long-term (monthly) basis including, but not limited to, the following:

  • Load cells
  • Tilt meters
  • Manual Readout units
  • Dataloggers
  • Tiltmeters
  • Inclinometers