GESTRA NRG 16-11S User manual

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Installation Instructions 818790-00
Level Electrode
NRG 16-11S
GESTRA Steam Systems
NRG 16-11S EN
English

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Contents
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Attention................................................................................................................................................. 4
Important Notes
Page
Explanatory Notes
Scope of supply ...................................................................................................................................... 5
Description NRG 16-11S.........................................................................................................................5
Function .................................................................................................................................................5
System components ...............................................................................................................................5
Design.................................................................................................................................................... 5
NRG 16-11S, step 1..............................................................................................................................12
NRG 16-11S, step 2..............................................................................................................................12
Attention............................................................................................................................................... 12
Important notes ....................................................................................................................................12
Tools.....................................................................................................................................................12
Installation
NRG 16-11S ...........................................................................................................................................6
Corrosion resistance ...............................................................................................................................7
Sizing .....................................................................................................................................................7
Name plate / marking .............................................................................................................................7
Dimensions NRG 16-11S ........................................................................................................................8
Technical Data
NRG 16-11S ...........................................................................................................................................9
Key.......................................................................................................................................................11
Design
NRG 16-11S .........................................................................................................................................10
Key.......................................................................................................................................................11
Functional Elements

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Electrical Connection
NRG 16-11S .........................................................................................................................................14
Wiring diagram .....................................................................................................................................15
Voltage table.........................................................................................................................................16
Note .....................................................................................................................................................16
Tools.....................................................................................................................................................16
Check wiring ........................................................................................................................................16
Apply mains voltage.............................................................................................................................. 16
Contents – continued –
Commissioning
Page
Low-level limiter...................................................................................................................................17
Note .....................................................................................................................................................17
Operation
Fault-finding list for troubleshooting......................................................................................................17
Operational Malfunctions
Danger .................................................................................................................................................18
Disposal................................................................................................................................................18
Decommissioning
NRG 16-11S .........................................................................................................................................13
Key.......................................................................................................................................................14
Examples of Installation

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Important Notes
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.
Usage for the intended purpose
Use level electrode NRG 16-11S only in conjunction with level switch NRS 1-7 for low-level limiting
(low level alarm) on board of seagoing vessels, mobile offshore platforms or river boats. The equipment
must not be used in explosion risk areas.
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.
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.

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Explanatory Notes
Scope of supply
NRG 16-11S
1 Level electrode NRG 16-11S, PN 40
1 Disk with set screw (measuring surface extension) – optional
1 Retaining ring – optional
1 Installation manual
Function
The water level limiter comprises a level electrode type NRG 16-11S and a level switch type NRS 1-7.
The level electrode NRG 16-11S consists of two concentrically arranged electrodes (measuring elec-
trode and compensating electrode) which are isolated from each other by special insulating seals.
The level limiter operation is based on the conductive measuring principle using the electrical
conductivity of water for signaling water level. During normal, trouble-free operation the level electrode
tip is immersed in boiler water and no low level alarm is given. A low level alarm will only be raised if
the electrode tip is exposed for more than 15 (25) seconds. A low level alarm will also be activated if
the insulating seals placed between the electrodes and the body are no longer pressure tight, allowing
water to penetrate into the body. However confirmation should always be done by checking if there
is water in the gauge glass. The equipment combination NRG 16-11S and NRG 1-7 provides fail safe
protection against a first fault in accordance with TRD 604.
System components
NRS 1-7
Level switch NRS 1-7. Two channel level limiter (redundancy) with periodic self-checking routine to
EN 50156-1.
Description NRG 16-11S
The level electrode NRG 16-11S is exclusively designed for seagoing vessels, mobile offshore platforms
and river boats. The level electrode NRG 16-11S detects the min. liquid level (low level alarm) in a
steam boiler. The operation of the electrode is based on the conductivity measuring principle using the
electrical conductivity of water for signaling one liquid level:
■ Low level alarm
The NRG 16-11S is designed for use in conjunction with level switch NRS 1-7 (15 sec.) as a self-
monitoring low level limiter with periodic self-checking (SMART) feature.
Application in steam and pressurised hot-water plants in accordance with TRD 604, sheet 1 and
sheet 2 (24 h/72 h operation) as well as EN 12952 and EN 12953.
The electrical equipment meets the requirements of the Regulations on Protection Circuits EN 50156-1.
Design
NRG 16-11S
End connection: Flanged PN 40, DN 50
Electrical connection: Four-pole connector

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NRG 16-11S
Type approval
SEE-BG GL-WB-93-349001
GL 88091 HH
RINA N° ELE/96695/1
LR 98/20076
BV 10618/Bo
KR HMB06190-MS001
NKK 02A 012
Service pressure
NRG 16-11S: 32 bar at 238°C
Connection
Flange, PN 40, DN 50
Materials
Flange: 1.0460 C22.8
Measuring electrode: 1.4401, X5CrNiMo17-12-2
Electrode insulation: Gylon®
Four pole connector: Polyamid (PA)
Lengths available
500 mm, 1000 mm, 1500 mm, 2000 mm
Cell constant C
0.13 cm-1 with measuring surface extension
0.3 cm-1 without measuring surface extension
Response sensitivity
10 µS/cm at 25 °C, cell constant 0.3 cm-1
0.5 µS/cm at 25 °C, cell constant 0.13 cm-1
Electrical connection
Four-pole connector, cable gland M 16
Protection
IP 65 to EN 60529
Max. admissible ambient temperature
70 °C
Weight
Approx. 6.0 kg
Technical Data
Gylon®is a registered trademark of Garlock Sealing Technologies, Palmyra NY, USA

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Corrosion resistance
Provided that the equipment is used for its intended purpose, its safety is not impaired by
corrosion.
Sizing
The body must not be subjected to sharp increases in pressure. Welds and flanges of the electrode are
designed to withstand dynamic loading (bending and alternating stress). The dimensional allowances
for corrosion and anti-corrosive additives reflect the latest state of technology.
Technical Data – continued –
Name plate / marking
Equipment designation
Fig. 1
Fig. 2

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Technical Data – continued –
Dimensions NRG 16-11S
Fig. 3
NRG 16-11S for marine applications
200
45
≥500

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Fig. 4
Design
1
5
7
2
3
4
6
NRG 16-11S
Fig. 5
8
9
80
!

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Fig. 6
(
/
%
$
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§
9
&
Functional Elements
NRG 16-11S