GESTRA NRGS 11-1, Installation Instructions Manual, Page: 5 / 24

5
Explanatory Notes
Scope of supply
Function
NRGS 111
1 Compact system NRGS 11-1, PN 6
1 Joint ring D 33 x 39 DIN 7603-1.4301
1 Installation manual
NRGS 161
1 Compact system NRGS 16-1, PN 40
1 Joint ring D 33 x 39 DIN 7603-1.4301
1 Installation manual
NRGS 161 S
1 Compact system NRGS 16-1 S (for marine applications)
1 Flanged DN 50, PN 40, DIN 2635
1 Installation manual
Description
The compact system NRGS 11-1, NRGS 16-1, NRGS 16-1 S works according to the conductivity
measurement system.
With the NRGS 11-1, NRGS 16-1 and NRGS 16-1 S a maximum of 4 levels can be signalled in
conductive liquids:

4 levels with one switchpoint each

high-level alarm, low-level alarm, pump ON, pump OFF with one switchpoint each.
The compact system has a level controller integrated in the terminal box for the control of all functions.
External switchgear is therefore not required.
The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which
means that they allow an electric current to flow through them. For the safe functioning of this
device a minimum conductivity of the liquid to be monitored is required
The conductivity measurement method can detect two conditions: electrode tip submerged or
exposed, meaning switchpoint reached or not reached.
Before installation, the length of the electrode tips must be cut to the required switching levels,
e. g. for high-level / low-level alarm, controlling of a valve or pump.
Design
NRGS 111, NRGS 161:
Screwed design 1" BSP, DIN ISO 228.
Fig. 1
NRGS 161 S:
Flanged design for marine application DN 50, PN 40, DIN 2635. Fig. 2