The level electrodes NRG 1...-50 are used in conjunction with
level switch NRS 1-50 as water level limiters for steam boiler
plants and (pressurised) hot water installations.
Water level limiters switch off the heating when the water
level falls below the set minimum level (low water).
When the water level falls below the low level, the level
electrode is exposed and a low level alarm is triggered in
the level switch NRS 1-50. This switchpoint “Low water level
(LW)” is determined by the length of the electrode tip. The
electrode operation is based on the conductive measuring
principle using the electrical conductivity of the water for
signalling water level.
The self-monitoring function ensures that an alarm will also
be triggered if the electrode insulation is contaminated or
has developed a leak and/or if there is a malfunction in the
The level electrode is installed inside steam boilers, vessels or
inlet lines of hot-water systems. The protection tube provided
on site ensures the function.
One level electrode NRS 1...-50 can be installed together with
one GESTRA level electrode, one level switch or transmitter
for water level control and low level alarm in one single
protection tube or level pot.
If the level electrode is installed in a level pot outside the boiler,
make sure that the connecting lines are rinsed regularly. In
addition, the logic unit SRL is required to monitor the purging
times and the purging sequence.
If the connecting lines for steam ≥ 40 mm and water ≥ 100
mm the installation is considered as “inside”. In this case the
purging process does not have to be monitored
"Gestra NRG16-50" More Information
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