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Bassett Convergence System

The Bassett Convergence System is designed to measure delta X and delta Z deformations of structures, in near real time.

The Bassett Convergence System is designed to measure delta X and delta Z deformations of structures, in near real time.
 
The Bassett Convergence System is designed for automated monitoring of tunnel deformation.

The system is robust, simple and proven. It is most commonly used in transportation tunnels, but can be adapted to monitor other structures.

The itmsoil Bassett Convergence System uses pairs of MEMS servo accelerometer sensors arranged within short and long arms; this provides near real time δx and δz data which in turn is converted to show the deformation in millimetres.

The system is supplied complete with a data logger and itmsoil software to display data, both as a graphical representation of the tunnel or structure, and also with X and Z graphs for each point. Full user defined alarm functionality can be built into the BCS system.

The itmsoil Bassett Convergence System is the only system officially authorised and endorsed by its inventor, Dr Richard Bassett, Emeritus Reader in Geotechnics at University College London.

 

Product Features

•Very low profile system
•Low cost, simple, rugged sensor technology
•Gives a complete δx and δz profile
•Automated via data acquisition and BCS software
•Very well established track record on major projects across the world
 

Product Benefits

•Can be fitted in areas of minimum clearance such as live railway tunnels
•Needs very little power to read
•Designed specifically for monitoring tunnels
•Suited for harsh environments
•Does not interfere with tunnel traffic
•Unaffected by vibration, temperature changes or electromagnetic interference caused by tunnel traffic

Ordering information
Long and Short Arm Assembly
TLT3-1.1 BCS long and short arm assembly; includes: Short Arm sensor ±173.65mm/m (±10 arc degrees), Long Arm sensor ±34.9mm/m (±2 arc degrees) and a 1.5m copper long arm
TLT3-4.1  BCS mounting bracket and pivot pin assembly; 1No. required per long & Short Arm assembly, plus one per ring

Connecting Cable
CA-3.1-4-IC  Instrument cable, 4 core, 7/0.20, screened; priced per metre, polyurethane jacket
CA-3.2-4-FR  Low smoke cable, 4 core, 16/0.20, screened; priced per metre, halogen-free cable
CA-4.2  Coloured adhesive tapes; set of 10No
W6-6.1  Nylon ties; 150mm x 3.5mm, pack of 100No
ST1-3.5  Nylon ties; 370mm x 4.7mm, pack of 100No


Software
TLT3-5.1  BCS data management and display; includes 3No. USB licence keys
TLT3-5.2  BCS software; configuration of the software per logger