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.
- - Water/dust proof, rugged and robust construction
- - Reliability, accuracy and simplicity in readings
- - High stability and sensitivity
|Sensor type||Vibrating Wire|
|Sensor range||25, 50, 100, 150, 200mm|
|Temperature Range||-20 to 80°C|
|Cable||4-wire shielded polyurethane jacket|