Monitoring of rock and soil subsidence , used in tunnels , dams , etc.

The DS830 multipoint borehole extensometer has been designed for the detection of micro-movements in soil or rock (subsidence, foundation settlements, convergence measurements in masonry structures, etc.).
The strain gauge detects variations in distance between two points: between the anchor placed in depth and the measuring head located on the surface. The DS830 strain gauge can be installed at great depths with great ease.
Several versions are available, from the single model with a single measuring base, or the model multiple which can consist of 2 to 8 measurement bases. The anchor points of the multiple strain gauge are distributed at different depths along the same hole
The extensometer head is made of stainless steel ensuring precision and efficiency even in the long term. The measuring heads, produced in several versions, are designed both for a mechanical type measurement (with removable centesimal comparator) and for a electric type measurement (with transducer potentiometric mod. DS810-01).
The rods (in invar / stainless steel / fiberglass) that join the points anchoring to the measuring head, they are protected by a sliding tube. The invar or stainless steel rods are available in lengths of 1, 2 or 3 meters and are joined directly on site, while those in fiberglass are made to the required size, and are rolled up for shipping.