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Hydrostatic Level Cells

Hydrostatic level cells (HLC) are used for monitoring settlement or heave in structures. Datasheet

Hydrostatic Level Cells

Applications

Typical applications include:

  • Monitoring differential settlements in structures affected by nearby excavation and tunneling.
  • Controlling critical activities such as compensation grouting.

Installation

System components include a reservoir, hydrostatic level cells, tubing, deaired liquid, and a datalogger.

One of the cells is deployed as the reference cell and is placed outside the zone of influence. The other cells are placed on the structure.

The reservoir is usually located near the reference cell. It must be placed at a higher elevation than any of the cells in the system to create the hydrostatic head. Tubing for liquid and atmosphere is connected to each cell and signal cable is routed to the data logger. Then the hydraulic circuits are filled with deaired liquid.

Operation

The difference in elevation between the reservoir and each cell creates hydrostatic pressure, and the sensor within each cell measures this pressure. Pressure readings are converted to inches or mm of settlement or heave when measurements are processed.

Settlement of the structure increases the difference in elevation between the reservoir, which is on stable ground, and the cell, which is sinking with the structure. The cell then reports increased pressure. If the structure heaves, the elevation difference decreases and the cell reports decreased pressure.

Hydrostatic Level Cells on bench