Gestra NRGS 11_2 NRGS 16_2

Description

The compact system NRGS 11-2, NRGS 16-2 works according to the conductivity measurement principle. With the NRGS 1...-2 a maximum of 3 levels can be signalled in conductive liquids:

 Low level alarm, pump ON, pump OFF with one normally open contact.

The NRGS 1...-2 has its level switch integrated in the electrode case for the control of all functions. An external switching device is not required. The NRGS 1...-2 has two electrode tips for the detection of low-water level. The low-level alarm is signalled via two separate switching channels. The NRGS 1...-2 is designed to detect and signal different levels in conductive liquids. It is appropriate for use in the power supply, water and chemical industries and particularly suitable for applications in steam boilers and feedwater tanks.

Design

NRGS 1...-2 screwed 1", EN ISO 228-1

Flange DN 50, DN 100 (optional)

Technical Data

Type approval

n° TÜV · WR/WB · 02-392

Max. service pressure

NRGS 11-2: 6 bar g at 159 °C

NRGS 16-2: 32 bar g at 238 °C

Connections

Screwed 1", EN ISO 228-1

Materials

Terminal box: 3.2161 G AlSi8Cu3

Stem: 1.4571 CrNiMoTi17-12-2

Housing: 1.4571

Flange 1.0460 C22.8

Measuring electrodes: 1.4571 CrNiMoTi17-12-2

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 (optional)

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 change-over contacts for low level alarm, 1 normally open contact (e.g. for pump) 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.

Indicators and adjustors

2 red LEDs for signalling “low water”,

1 green LED “pump ON”,

1 four-pole code switch for changing sensitivity,

1 button for testing the function of low-level alarm

1 button for resetting the low-water alarm.

Cable entry

Cable gland with integral cable clamp

M 16 (PG 9)

M 20 (PG 16)

Protection

IP 65 acc. to DIN 40050

Max. admissible ambient temperature

70 °C

Weight

approx. 0.8 kg

Gestra NRGS 11_2 
Gestra NRGS 16_2

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 measured is required.
The conductivity measurement method can detect two 
conditions: electrode rod submerged or exposed, meaning 
switchpoint reached or not reached. Before installation, 
the length of the electrode tip must be cut to the required 
switching levels, e. g. for max./min. alarm, controlling of 
a valve or pump.