Tunnel Convergence Meters are used to measure deformation in tunnels and underground caverns by measuring the contraction/elongation between two anchor points fixed in the wall of the tunnel cavern.
The Tunnel Convergence Meter of PMT consists of a spring tensioned vibrating wire sensor assembly, turnbuckle, 6/8mm diameter connecting rods of stainless steel/fiber glass, rod clamp and a pair of anchor points. Change in distance between the two anchors causes tension of the vibrating wire inside the VW transducer which is transmitted through a cable to the readout unit.
Introduction:
Features:
- - Water/dust proof, rugged and robust construction
- - Reliability, accuracy and simplicity in readings
- - High stability and sensitivity
Specifications:
| PMT | |
|---|---|
| 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 80°C |
| Non-Linearity | <0.5% F.S. |
| Cable | 4-wire shielded polyurethane jacket |