Operating and service instructions
|
LMS 120
4
1.
Scope of delivery
•
LMS 120 monitoring device with pre-installed mains cable
•
Plug connector - insert for alarm terminal
•
Plug connector - inserts for monitoring channels 1 and 2 terminals
•
Operating instructions
•
Drilling template
2.
General
The LMS 120 is suitable for monitoring two sensor wires in district heating pipelines. These may be executed in accordance with the
NORDIC or BRANDES system. The so-called SWISS system corresponds to the Nordic system with one isolated conductor.
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.
(see 4.2. Operation menu; page 8)
2.1. 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
R
et
ur
n
Ex
t.
al
ar
m
Relay
Display
Keys
CPU
Measurement
module
1
Measurement
module
2
Pi
pe
Pi
pe
