Flowserve NRGS 16-4 User Manual
GESTRA Steam Systems
NRG 16-4
Installation Instructions 818596-00
Level Electrode NRG 16-4
Contents
Page
Important Notes
Usage for the intended purpose...............................................................................................................4
Safety note..............................................................................................................................................4
Danger note ............................................................................................................................................4
ATEX (Atmosphères Explosibles)..............................................................................................................4
Explanatory Notes
Scope of supply.......................................................................................................................................5
Description..............................................................................................................................................5
Function..................................................................................................................................................5
System components................................................................................................................................5
Design ....................................................................................................................................................5
Technical Data
NRG 16-4................................................................................................................................................6
Corrosion resistance................................................................................................................................7
Sizing......................................................................................................................................................7
Name plate .............................................................................................................................................7
Dimensions .............................................................................................................................................8
Key .........................................................................................................................................................9
Functional Elements
NRG 16-4................................................................................................................................................9
Key .........................................................................................................................................................9
Installation
Cutting electrode tip to length ...............................................................................................................10
Mounting electrode ...............................................................................................................................10
Tools.....................................................................................................................................................11
Examples of Installation.........................................................................................................................12
Key .......................................................................................................................................................13
Wiring
Terminal box .........................................................................................................................................14
Wiring diagram......................................................................................................................................15
Tools.....................................................................................................................................................15
Commissioning
Check wiring .........................................................................................................................................15
Apply mains voltage ..............................................................................................................................15
2
Contents
Page
Malfunctions
Fault finding list for troubleshooting ...................................................................................................... 16
Decommissioning
Danger note.......................................................................................................................................... 17
Disposal ............................................................................................................................................... 17
3
Important Notes
Usage for the intended purpose
The level electrode NRG 16-4 is exclusively designed for detecting and signalling levels in liquids with a
minimum electrical conductivity.
The equipment must only be used within the admissible pressure and temperature ratings.
Any type of use differing from the usage described above must be considered as improper. The resulting
risk will have to be borne by the user alone. The manufacturer hereby expressly rejects any claims for any
damage resulting from improper usage.
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 train-
ing - have achieved a recognised level of competence.
For installation, removal, commissioning and operation of the equipment every person who works with the
equipment must have read and understood the complete installation manual. Furthermore, responsibilities
must have been defined clearly and unambiguously and must be adhered to.
Usage of the equipment for the intended purpose includes compliance with the rules and notes in these
installation instructions for installation, removal, commissioning and operation.
The operating company must ensure that, whenever the equipment is being operated, it is in perfect condition.
Working methods that jeopardise safety must not be used!
Danger note
Danger
When loosening the level 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 zero!
The level electrode becomes hot during operation. Touching the hot equipment presents the
risk of severe burns to hands and arms. All installation, removal and maintenance work must
only be performed when the equipment is cold.
ATEX (At
The equipment is a simple item of electrical equipment according to DIN EN 50020 section 5.4. According
to the European Directive 94/9/EC the equipment must be equipped with approved Zener barriers if used
in potentially explosive areas.
Applicable in Ex zones 1, 2 (1999/92/EC).
The equipment does not bear an Ex marking.
The suitability of the Zener barriers is certified in a separate document.
4
mosphères Explosibles
)
Explanatory Notes
Scope of supply
■
1 Level electrode type NRG 16-4
■
1 Joint ring 17x 21 form D to DIN 7603, made from 1.4301, bright annealed
■
1 Installation manual
Description
The level electrode NRG 16-4 is designed for detecting and signalling levels in liquids with a minimum
electrical conductivity.
Depending on the type of level switch used the electrode can detect the highest or lowest (max./min.) liquid
level.
The level electrode NRG 16-4 can be used in conjunction with level switches NRS 1-1, 1-2, 1-3 and 1-5
as part of a water level control, high level alarm or water level limiting system (without SMART function) in
steam boilers and pressurised hot water plants.
Function
For the correct functioning of the level electrode NRG 16-4 together with level switch NRS 1-... a minimum
electrical conductivity of 0.5 µS/cm at 25°C of the water is required.
The switching signal is triggered off as soon as the electrode tip submerges or is exposed.
The electrode tip is simply cut to length to give the required switching level.
System components
Level switch
Level switch
Level switch
Level switch
Design
NRG 16-4:
Electrode with screwed connection 3/ 8" BSP, ISO 228-1.
NRS 1-1
NRS 1-2
NRS 1-3
NRS 1-5
,
,
,
,
5
Technical Data
NRG 16-4
Type approval no.
TÜV. WR/WB. 03-302
Service pressure
32 barg at 238°C
Connection
Screwed 3/8" BSP, ISO 228-1
Materials
Screw-in body: 1.4571, CrNiMoTi17122
Electrode tip: 1.4571, CrNiMoTi17122
Electrode insulation: PTFE
Terminal box and connector: Plastic
Electrode tip
Lengths supplied: 500, 1000, 1500 mm
Diameter: 5 mm
Sensitivity
> 0.5 µS/cm (depending on level switch)
Wiring
Four-pole connector with screw terminals, cable strain relief and cable gland PG 11
Protection
IP 65 to EN 60529
Ambient temperature at terminal box
Max. 70°C
Weight
Approx. 0.5 kg
(at 25°C)
6
Loading...