Gestra NRGS 11_1 NRGS 16_1 NRGS 16_1S

Description

The compact systems NRGS 11-1 and NRGS 16-1 work according to the conductivity measurement principle. With the NRGS 16-1 a maximum of 4 levels can be signalled in conductive liquids:

High-level alarm, Low-level alarm, pump ON, pump OFF with one switchpoint each.

The NRGS 1...-1 has a switching controller integrated in the electrode terminal box. External switchgear is not required. The NRGS 11-1 / NRGS 16-1 are designed to detect and signal different levels in conductive liquids. They are appropriate for use in the power supply, water and chemical industries and particularly suitable for applications in steam boilers and feedwater tanks.

Designs

NRGS 11-1 screwed 1" BSP (DIN ISO 228)

NRGS 16-1 screwed 1" BSP (DIN ISO 228)

NRGS 16-1 S flanged DN 50, PN 40, DIN 2635, for marine applications

Technical Data

Type Approval

N° NRGS 16-1: TÜV · WRB · 01-388

NRGS 16-1 S: GL 99250-96 HH LR 98/20075 RiNA No ELE / 30298/1

Max. service pressure

NRGS 11-1: 6 barg at 159 °C

NRGS 16-1 / NRGS 16-1S: 32 barg at 238 °C

Connections

Screwed 1" BSP, DIN ISO 228

Flanged DN 50, PN 40, to DIN 2635

Materials

Case: Die cast aluminium 3.2161 (G AlSi8Cu3)

Stem: Stainless steel 1.4571 (CrNiMoTi17-12-2)

Flange: Forged steel 1.0460 (C 22.8)

Measuring electrodes: S. S. 1.4571

Electrode insulation: PTFE

Spacer disc: PTFE

Lengths supplied

500 mm

1000 mm

1500 mm

Mains supply

230 V +/– 10 %, 50/60 Hz

115 V +/– 10 %, 50/60 Hz

24 V +/– 10 %, 50/60 Hz (option)

Power consumption

5 VA Fuse Thermal

fuse

Tmax = 102 °C

Sensitivity Range

1: 10 μS/cm Range 2: 0.5 μS/cm

Electrode voltage

10 V_ss

Output

4 volt-free relay contacts. Max. contact rating with a switching voltage of 24 V, 115 V and 230 V a. c.: resistive 4 A, inductive 0.75 A at cos ϕ 0.5. Max. contact rating with a switching voltage of 24 V d. c.: 4 A Contact material: silver, hard-gold plated.

Energizing/deenergizing

delay: 3 sec., factory set

Indicators and adjustors

4 red LEDs for signalling “electrode submerged”, “output relay energized” One 4-pole code switch for changing sensitivity

Cable entry

Cable glands with integral cable clamps 2 x PG 9 (M 16) 1 x PG 16 (M 20)

Protection

IP 65 acc. to DIN EN 60529

Max. permissible ambient temperature

70 °C (158 °F)

Weight approx.

1.8 kg

Gestra NRGS 11_1 
Gestra NRGS 16_1 
Gestra NRGS 16_1S

The conductivity of the liquid is used to detect 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 mimimum 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 exceeded) or not yet reached. 
Before installation, the length of the electrode rod must be 
adapted to the switching levels, e.g. for max./min. alarm, 
controlling of a valve or pump.