Model EAN-42M(MTI.EWS.ER.M-EAN-42M) beam sensor consists of a basic MEMS sensor housed inside a metal beam, which can be 1 m, 2 m, or 3 m long. Model EAN-41M beam sensor output is 4 V nominal at ± 15°. This output can be carried over long distances without any signal degradation. Model EAN-42M comes with SDI-12 digital interface such that all sensors can be connected through single bus cable to datalogger. The sensor provides a relatively low cost system which offers excellent resolution and long term stability. Movement of the structure causes change in tilt of the beam sensor, which results in change in output of the sensor. Measurements can be made on horizontal or vertical surfaces. Subsequent sets of readings show how the structure is behaving and will give an indication of permanent deformations as time progresses. The beam sensor is provided with special mounting fasteners for horizontal and vertical installations on concrete structures. For monitoring differential settlement along railway tracks, installation may be required on wooden railway track sleepers. For such installation, mounting plates are available (at extra cost). Please refer to the adjacent figure. The wood mounting fasteners can be sourced locally