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.

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