Settlement Extensometer

Application

Settlement Extensometer
Datasheet

The settlement extensometer is used to monitor large settlements in foundations of embankments.

Operation

The extensometer consists of an anchor, a stainless steel rod inside protective pipe, and a potentiometer inside a waterproof head.

A borehole is drilled down to competent ground. The anchor and rod are installed downhole. The borehole is then backfilled with a soft grout. A small excavation is made for the head. The head is then attached to the rod, tested, and then embedded in the small excavation. The head and signal cable should be protected by at least six inches of hand-compacted sand. Signal cable from the extensometer is terminated at a readout station or connected to a data logger.

As the ground settles with the placement of fill material, the head moves downward. The potentiometer inside the head measures take-up of a tensioned wire and transmits the measurement to the data logger.

For more information

Please download the datasheet for the Settlement Extensometer . This document can be viewed and printed with Adobe Acrobat Reader.