Flowserve NRG 111-11 User Manual
GESTRA
GESTRA Steam Systems
NRG 111-11
Installation Instructions 810898-01
Level Electrode
NRG 111-11
1
Contents
Page
Important Notes
Usage for the intended purpose .............................................................................................................. 4
Safety note ............................................................................................................................................. 4
Danger ................................................................................................................................................... 4
Classification pursuant to article 1 of the Pressure Equipment Directive (PED) ........................................ 4
Explanatory Notes
Scope of supply...................................................................................................................................... 4
Description............................................................................................................................................. 5
Function ................................................................................................................................................. 5
System components ............................................................................................................................... 5
Design ................................................................................................................................................... 5
Technical Data
NRG 111-11 ........................................................................................................................................... 6
Corrosion resistance .............................................................................................................................. 7
Sizing ..................................................................................................................................................... 7
Name plate /marking ............................................................................................................................. 7
Dimensions ............................................................................................................................................ 8
Design
NRG 111-11 ........................................................................................................................................... 9
Key ...................................................................................................................................................... 11
Functional Elements
NRG 111-11 ......................................................................................................................................... 10
Key ...................................................................................................................................................... 11
Installation
NRG 111-11, step 1 ............................................................................................................................. 12
NRG 111-11, step 2 ............................................................................................................................. 12
Tools .................................................................................................................................................... 13
Examples of installation ....................................................................................................................... 14
Key ...................................................................................................................................................... 15
Wiring
NRG 111-11 ......................................................................................................................................... 15
Wiring diagram .................................................................................................................................... 16
Voltage table ........................................................................................................................................ 17
Tools .................................................................................................................................................... 17
2
Contents – continued –
Page
Commissioning
Check wiring ........................................................................................................................................ 17
Apply mains voltage ............................................................................................................................. 17
Operation
Water level limiter ................................................................................................................................ 18
Operation Malfunctions
Fault finding list for troubleshooting ..................................................................................................... 18
Annex
Declaration of Conformity ..................................................................................................................... 19
3
Important Notes
Usage for the intended purpose
Use level electrode type NRG 111-11 only in conjunction with NRS 1-7 as water level limiter
(low level alarm). The equipment must not be used in explosion risk areas.
Safety Note
The equipment must only be installed and commissioned by qualified and adequately trained
personnel.
Maintenance and retrofitting must only be performed by entrusted personnel who – through adequate
training – have achieved a recognized level of competence.
Danger
When loosening the electrode steam or hot water might escape. This presents the danger
of severe scalding. It is therefore essential not to remove the electrode unless the boiler
pressure is verified to be 0 barg.
The electrode is hot during operation. This presents the danger of severe burns to hands
and arms. Installation and maintenance work should only be carried out when the system
is cold.
If the internal ceramic insulation breaks hot steam may escape through the lateral relief
vent of the electrode stem.
This presents the danger of severe scalding!
Do not stand close to the electrode during operation.
Classification pursuant to article 1 of the Pressure Equipment Directive (PED)
Category IV
Designation Safety accessory
CE marking CE 0525
Explanatory Notes
Scope of supply
NRG 111-11
1 Level electrode NRG 111-11
1 Gasket 33x 39 DIN 7603-1.4301
1 Sealing plug for M 20 connection
1 Surface extension disk with grub screw
1 Lock washer
1 Installation manual
4
Explanatory Notes – continued –
Description
The level electrode NRG 111-11 detects the min. liquid level (low level alarm) in a steam boiler. The
operation of the electrode is based on the conducitivity measuring principle using the electrical
conductivity of water for signalling one liquid level:
■ Low level alarm (MIN alarm)
The NRG 111-11 is designed for use in conjunction with level switch NRS 1-7 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
(24h/72h operation) as well as EN 12952 and 12953.
The electrical equipment meets the requirements of the Regulations on Protection Circuits DIN VDE
0116 (prEN 501565-1).
Function
The water level limiter comprises the level electrode type NRG 111-11 and GESTRA level switch NRS
1-7. The level electrode NRG 111-11 consists of two concentrically arranged electrodes (measuring
electrode 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 signalling 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 3 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 cavities between the body, tube and stud. However in this
instance the alarm is caused by a malfunction of the electrode, and confirmation should always be
done by checking if there is water in the gauge glass. The equipment combination NRG 111-11 and
NRS 1-7 provides fail safe protection against a first fault in accordance with TRD 604.
If the internal ceramic insulation breaks steam and hot water may escape through the lateral relief
vent of the electrode stem.
System Components
NRS 1-7
Level switch NRS 1-7, 0.5 µS version. The limiter features a two channel circuit (redundancy) and an
automatic periodic self-checking routine in accordance with DIN VDE 0116 (prEN 50156-1).
Design
NRG 111-11:
Level electrode with screwed connection 1" BSP, ISO 228-1. Fig. 1
5
Technical Data
NRG 111-11
Type approval no.
TÜV· WB· 01-354
EG 01 202 931-B-01-0077-01
Service pressure
NRG 111-11: 183 barg (at 357 °C)
Connection
1" BSP (to ISO 228-1)
Flange PN 320, DN 50, DIN 2501-1 (optional)
Flange PN 250, DN 80, DIN 2501-1 (optional)
Materials
Body 3.2161 G AlSi8Cu3
Stem 1.4529,
Measuring electrode
Electrode insulation: Special ceramic material
Lengths available
500 mm
1000 mm
1500 mm
2000 mm
2500 mm
3000 mm
pH value
Max. admissible: 10
Cell constant C
0.13 cm
Response sensitivity
0.5 µS/cm up to 400 µS/cm at 25 °C
Cable entry
Cable gland with integrated cable clamp
M 20 (2) (PG 16)
Protection
IP 65 to DIN EN 60529
Max. admissible ambient temperature
70 °C
Weight
Approx. 1.8 kg
X39CrMo17-1
1.4401,
X5CrNiMo17-12-2
-1
with measuring surface extension
6
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