Flowserve NRGS 11-2 User Manual
GESTRA Steam Systems
NRGS 11-2
NRGS 16-2
Installation Instructions 810366-01
Level Electrode Types
NRGS 11-2, NRGS 16-2
1
2
Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................4
Safety note ............................................................................................................................................. 4
Danger ...................................................................................................................................................4
Attention .................................................................................................................................................4
ATEX ( Atmosphère Explosible) ...............................................................................................................4
Explanatory Notes
Scope of supply ......................................................................................................................................4
System description .................................................................................................................................5
Function .................................................................................................................................................5
Design ....................................................................................................................................................5
Technical Data
NRGS 11-2, NRGS 16-2 ......................................................................................................................
Corrosion resistance ...............................................................................................................................7
Sizing .....................................................................................................................................................7
Name/marking ........................................................................................................................................7
Dimensions ............................................................................................................................................. 8
Design
NRGS 11-2, NRGS 16-2 .......................................................................................................................... 9
Key ....................................................................................................................................................... 11
Functional Elements
NRGS 11-2, NRGS 16-2 ........................................................................................................................ 10
Key ....................................................................................................................................................... 11
Installation
NRGS 11-2, NRGS 16-2 ........................................................................................................................12
Table 1 .................................................................................................................................................12
Attention ...............................................................................................................................................12
Note .....................................................................................................................................................12
Tools .....................................................................................................................................................12
Example of installation ..........................................................................................................................13
Key .......................................................................................................................................................14
5, 6
Contents continued
Page
Wiring
NRGS 11-2, NRGS 16-2 ........................................................................................................................ 15
Wiring diagram .....................................................................................................................................15
Attention ...............................................................................................................................................15
Tools .....................................................................................................................................................15
Basic Settings
Factiory settings ..................................................................................................................................16
Switch selection fo measuring range ....................................................................................................16
Attention ...............................................................................................................................................16
Tools .....................................................................................................................................................16
Commissioning
Warning ................................................................................................................................................17
Wiring check ......................................................................................................................................... 17
Application of mains voltage ................................................................................................................. 17
Check assignment of switching functions .............................................................................................17
Check low-level alarm .......................................................................................................................... 17
Operation
Resetting low-level alarm .....................................................................................................................17
Troubleshooting
Fault finding list .................................................................................................................................... 18
Annex
Declaration of conformity ......................................................................................................................19
3
4
Important Notes
Usage for the intended purpose
Use level electrodes NRGS 11-2 and NRGS 16-2 only for indicating liquid levels.
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who – through
adequate training – have achieved a recognised level of competence.
Danger
When loosening the electrode steam or hot water might escape.
This presents the danger of severe scalds to the whole body.
It is essential not to mount or dismantle the electrode unless the boiler pressure is
verified to be 0 bar. The electrode becomes hot during operation. Touching the hot
equipment presents the risk of severe burns to hands and arms. All installation and
maintenance work must only be performed when the equipment is cold.
The terminal strip of the NRGS 11-2, NRGS 16-2 is live during operation.
This presents the danger of electric shock.
Cut off power supply before fixing or removing the housing cover.
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
ATEX ( Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in potentially explosive
areas.
Explanatory Notes
Scope of supply
NRGS 11-2
1 Compact system type NRGS 11-2
1 Joint ring (of stainless steel 1.4301) D 33 x 39 to DIN 7603
1 Installation manual
NRGS 16-2
1 Compact system type NRGS 16-2
1 Joint ring (of stainless steel 1.4301) D 33 x 39 to DIN 7603
1 Installation manual
Explanatory Notes continued
System description
The compact system NRGS 11-2, NRGS 16-2 works according to the conductivity measurement prin
ciple. With the NRGS 11-2, NRGS 16-2 a maximum of 3 levels can be signalled in conductive liquids:
■ Low level alarm, pump ON, pump OFF with a normally open contact
The NRGS 11-2 / NRGS 16-2 has its level switch integrated in the electrode case for the control of all
functions. An external switching device is not required.
The NRGS 11-2 / NRGS 16-2 has two electrode tips for the detection of low water level. The signalling
of the low-level alarm is effected via two separate switching channels.
Function
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 tip 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.
Designs
NRGS 11-2: Screwed design 1" BSP, EN ISO 228-1, PN 6.
NRGS 16-2: Screwed design 1" BSP, EN ISO 228-1, PN 40. Fig. 1
Technical Data
-
NRGS 11-2, NRGS 16-2
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 Die cast aluminium 3.2161 G AlSi8Cu3
Stem
S.S. 1.4571 CrNiMoTi17-12-2
Housing 1.4571
Flange Forget steel 1.0460 C22.8
Measuring electrodes
Electrode insulation PTFE
Spacer disc PTFE
S.S. 1.4571 CrNiMoTi17-12-2
5
6
Technical Data continued
NRGS 11-2, NRGS 16-2 continued
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 T
Sensitivity
Range 1: 10 µS/cm
Range 2: 0.5 µS/cm
Electrode voltage
10 V
Output
4 volt-free relay 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 for signalling “Pump ON”,
1 four-pole code switch for changing sensitivity,
1 button “TEST” for checking low-level alarm
1 button “RESET” for resetting the low-level alarm
Cable entry
Cable gland with integral cable clamp
M 16 (PG 9)
M 20 (PG 16)
Protection
IP 65 to DIN 40050
Max. admissible ambient temperature
70 °C
Weight
approx. 0.8 kg
= 102 °C
max
ss
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