8 1 2015 Monitoring technology Visileak VSL Subject to technical changes Device description LMS 120 Technical data Device description General The monitoring device is suitable for controlling sensor wires in district heating pipelines The system is based on measuring resistances between the connecting contacts With the LMS 120 it is possible to control various monitoring systems permanently The measurement interval can be set An error memory is also installed in the device The technical design allows monitoring of two different system types at the same time As such it is possible to connect one line with the NORDIC system on measurement channel 1 and one line with the BRANDES system on measurement channel 2 for instance The system is based on measuring resistances between monitoring conductors and the metal medium pipe or the resistances of measurement loops All measured values can be read from the display Technical data Info display and LED Free parameter setting Operating voltage 110 230 V AC Monitoring cycles 2 channels Length of pipeline per channel Brandes 1 x Cu 1 x CrNi 1 000 m EMS nordic 2 x Cu blank 2 500 m Swiss each 1 x Cu blank isolated 2 500 m Fault pot free converter 2 A 30 V Dimensions 182 x 180 x 90 mm Permissible ambient temperature 0 50 C Protection category IP 65 System design The LMS 120 has measurement channels operating free of potential to increase measurement precision and minimise the influence of parasitic current measurements in the pipe Fig 1 System design Vo lta ge 1 Vo lta ge 2 Se ns or Re tu rn Se ns or Re tu rn Ex t al ar m Relay Display Keys CPU Measurement module 1 Measurement module 2 Pi pe Pi pe 8 300

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