Borehole Extensometer is used to monitor displacement or deformation in soil, rock and concrete structure at various depths using rods of different material and lengths with reference to the instrument head.
The Borehole Extensometer of PMT consists of anchors, rods, protective tubes and a VW displacement sensor. The VW sensor measures the settlement or heave as movement in layers change. The anchors coupled to the rod are installed in the borehole. The anchors and anchor rods referenced to stable ground, move up or down as movement in borehole occurs. This changes tension of the vibrating wire inside the VW transducer which is transmitted through a cable to the readout unit.
Introduction:
Features:
- - Flush with surface: no electrical head protruding out of borehole.
- - Suitable for tensile and compressive movements.
- - Reliability, accuracy and simplicity in readings.
- - Remote data logging and data reading.
Specifications:
| Sensor type | Vibrating Wire |
|---|---|
| Sensor range | 25, 50, 100,150, 200mm |
| Resolution | 0.02% F.S. |
| Accuracy | ±0.1% F.S |
| Temperature Range | -20 to 80C |
| Non-Linearity | <0.5% F.S. |
| Cable | 4-wire shielded polyurethane jacket |