GESTRA NRS 1-56 User manual
Original Installation &
Operating Manual
EN
English
Level Switch
NRS 1-56
850142-00
2NRS 1-56 - Installation & Operating Manual - 850142-00
Contents
Content of this Manual................................................................................................................................... 4
Scope of delivery/Product package............................................................................................................... 4
How to use this Manual.................................................................................................................................. 5
Illustrations and symbols used...................................................................................................................... 5
Hazard symbols in this Manual...................................................................................................................... 5
Types of warning ............................................................................................................................................ 6
Specialist terms/Abbreviations...................................................................................................................... 7
Usage for the intended purpose..................................................................................................................... 8
Applicable directives and standards...........................................................................................................9
Improper use .................................................................................................................................................. 9
Basic safety notes ........................................................................................................................................ 10
Required personnel qualifications............................................................................................................... 10
Notes on product liability............................................................................................................................. 10
Function ........................................................................................................................................................ 11
Technical data .............................................................................................................................................. 12
Name plate/Identification NRS 1-56 ............................................................................................................ 14
Factory settings............................................................................................................................................ 14
Functional elements and dimensions.......................................................................................................... 15
Installing the NRS 1-56 level switch............................................................................................................ 16
Electrical connection safety notes............................................................................................................... 16
Wiring diagram for the NRS 1-56 level switch............................................................................................ 17
Electrical connection.................................................................................................................................... 18
Connecting the 24V DC power supply .....................................................................................................18
Connecting the output contacts................................................................................................................18
Connecting the level electrodes ...............................................................................................................18
Connection examples ................................................................................................................................... 19
Inlet control - various level electrodes connected..................................................................................... 19
Discharge control - various level electrodes connected............................................................................ 20
Changing the equipment settings................................................................................................................ 21
Changing the sensitivity and function....................................................................................................... 21
Configuring the function and sensitivity.................................................................................................... 22
Bringing into service - starting, switchpoints and function test................................................................ 23
Bringing into service - operation, testing.................................................................................................... 25
3NRS 1-56 - Installation & Operating Manual - 850142-00
Contents
System malfunctions.................................................................................................................................... 27
Causes ....................................................................................................................................................27
Indication of system malfunctions............................................................................................................28
Action against high-frequency interference..............................................................................................28
What to do in the event of system malfunctions......................................................................................... 29
Taking out of service.................................................................................................................................... 29
Disposal ........................................................................................................................................................ 29
Returning decontaminated equipment........................................................................................................ 29
EU Declaration of Conformity....................................................................................................................... 30
4NRS 1-56 - Installation & Operating Manual - 850142-00
Content of this Manual
Product:
Level switch
NRS 1-56
First edition:
BAN 850142-00/10-2019cm
You can find the latest Installation & Operating Manuals on our website:
http://www.gestra.com/documents/brochures.html
© Copyright
All rights reserved. Any misuse, particularly reproduction and dissemination to third parties, is not permit-
ted. The General Terms & Conditions of GESTRA AG apply.
Scope of delivery/Product package
1 x level switch
NRS 1-56
1 x Installation & Operating Manual
5NRS 1-56 - Installation & Operating Manual - 850142-00
How to use this Manual
This Installation & Operating Manual describes the correct use of the NRS 1-56 level switch. It applies
to persons who integrate this equipment in control systems, install, bring into service, operate, maintain
and dispose of this equipment. Anyone carrying out the above-mentioned activities must have read this
Installation & Operating Manual and understood its contents.
Read this Manual in full and follow all instructions.
Please also read the instructions for use of any accessories.
The Installation & Operating Manual is part of the product package. Keep it in an easily accessible
location.
Availability of this Installation & Operating Manual
Make sure this Installation & Operating Manual is always available to the operator.
If you pass on or sell the equipment to a third party, please also hand over the Installation & Operating
Manual.
Hazard symbols in this Manual
Danger zone/Dangerous situation
Danger of death from electric shock
Illustrations and symbols used
1. Action to be taken
2.
Lists
Bullet points in lists
A Keys to illustrations
Additional
information
Read the relevant
Installation & Operating Manual
6NRS 1-56 - Installation & Operating Manual - 850142-00
Types of warning
DANGER
Warning of a dangerous situation that results in death or serious injury.
WARNING
Warning of a dangerous situation that may possibly result in death or serious injury.
CAUTION
Warning of a situation that may result in minor or moderate injury.
ATTENTION
Warning of a situation that results in damage to property or the environment.
7NRS 1-56 - Installation & Operating Manual - 850142-00
Specialist terms/Abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
NRG .. / NRS ..
GESTRA equipment and type designations, see page 8.
SELV
Safety Extra Low Voltage
8NRS 1-56 - Installation & Operating Manual - 850142-00
Usage for the intended purpose
The NRS 1-56 level switch can be used in conjunction with various conductive level electrodes as an
interval level control system in pressurised steam and hot-water plants and in condensate and feedwater
tanks.
The NRS 1-56 level switch also indicates two alarm states, which can be configured as MIN and MAX.
Overview of possible unit combinations
Level switch Level electrode Version
NRS 1-56 NRG 1-52 4-rod electrode
NRS 1-56 4 x NRG 16-4 1-rod electrode
NRS 1-56 NRG 16-36 4-rod electrode
Fig. 1
Key to Fig. 1:
NRG = level electrode
NRS = level switch
To ensure the proper use of equipment for all types of use, please also read the Installation &
Operating Manuals for the system components used.
You can find the latest Installation & Operating Manuals for the system components named
in Fig. 1 on our website:
http://www.gestra.com/documents/brochures.html
9NRS 1-56 - Installation & Operating Manual - 850142-00
Usage for the intended purpose
Applicable directives and standards
The NRS 1-56 level switch has been tested and approved for use in the scope governed by the following
directives and standards:
Directives:
Directive 2014/68/EU Pressure Equipment Directive
Directive 2014/35/EU Low Voltage Directive
Directive 2014/30/EU EMC Directive
Directive 2011/65/EU RoHS Directive
Standards:
DIN EN 60730-1 Automatic electrical controls – Part 1:
General requirements
EN 61326-1 Electrical equipment for measurement, control and laboratory use –
EMC requirements
Standards documents:
VdTÜV Bulletin BP WASS 0100-RL
Requirements for water level control and limiting equipment
Improper use
There is a danger of death due to explosion if the equipment is used in potentially explo-
sive atmospheres.
Do not use the equipment in potentially explosive atmospheres.
10 NRS 1-56 - Installation & Operating Manual - 850142-00
Basic safety notes
There is a risk of electric shock during work on electrical systems.
Always switch off the voltage to the equipment before performing work on the terminal
strips.
Check that the plant is not carrying live voltage before commencing work.
Faulty equipment jeopardises plant safety.
If the NRS 1-56 level switch does not behave as described on page 23, it may be faulty.
Perform failure analysis.
Only replace faulty equipment with identical equipment from GESTRA AG.
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical connection/
bringing into service Specialist staff Electrician/installer
Operation Boiler service technician Staff trained by the plant operator
Maintenance work Specialist staff Electrician
Setup work Specialist staff Plant construction
Fig. 2
Notes on product liability
The manufacturer cannot accept any liability for damages resulting from improper use of the equipment.
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