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 24V 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

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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.

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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

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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.

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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.