GESTRA NRG 26-60 User manual

Original Installation &
Operating Manual
EN
English
Level Electrode
NRG 26-60
819875-00

2NRG 26-60 - Installation & Operating Manual - 819875-00
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...........................................................................................................8
Admissible system components.................................................................................................................9
Improper use .................................................................................................................................................. 9
Basic safety notes ........................................................................................................................................ 10
Required personnel qualifications............................................................................................................... 11
Notes on product liability............................................................................................................................. 11
Function ........................................................................................................................................................ 12
Technical data .............................................................................................................................................. 15
Name plate/Identification ............................................................................................................................ 17
Factory settings............................................................................................................................................ 18
Overall view of the NRG 26-60 ..................................................................................................................... 19
Dimensions of the NRG 26-60 ...................................................................................................................... 20
Preparing for installation ............................................................................................................................. 21
Installation.................................................................................................................................................... 22
Sealing surface dimensions for NRG 26-60.............................................................................................. 23
Example ..................................................................................................................................................23
Installing two level electrodes in a flange................................................................................................. 24
Installation examples with dimensions....................................................................................................... 25
Aligning the terminal box............................................................................................................................. 30
Functional elements............................................................................................................................. 31
Connecting the CAN bus system.................................................................................................................. 32
Bus line, cable length and cross-section .................................................................................................. 32
Example ..................................................................................................................................................32
Important notes on connecting the CAN bus system................................................................................. 33
Pin assignment of the CAN bus connector and coupling for non pre-wired
control cables..........................................................................................................................................33

3NRG 26-60 - Installation & Operating Manual - 819875-00
Contents
Bringing into service .................................................................................................................................... 34
Changing the factory settings if necessary............................................................................................... 34
Notes on changing the communication parameter “GrP or bd.rt”..............................................................36
Changing the controller group “GrP”........................................................................................................ 37
Changing the baud rate “bd.rt”................................................................................................................ 37
Performing a calibration to the lower bound of the active measurement range “CAL.L”
(0 % calibration value) ............................................................................................................................. 38
Performing an independent quick calibration to a water level > 25 % of the active
measurement range “CAL.P”................................................................................................................... 38
Performing a calibration to the upper bound of the active measurement range “CAL.H”
(100 % calibration value) ......................................................................................................................... 39
Setting the filter constant “Filt”................................................................................................................39
Manually triggering a display test ............................................................................................................39
Activating URB 2 compatibility “ConP”.....................................................................................................40
Check the MIN and MAX limit values of the NRR 2-6x level controller by raising or lowering the level ......40
Starting, operation and testing .................................................................................................................... 41
System malfunctions.................................................................................................................................... 43
Causes ....................................................................................................................................................43
Indication of system malfunctions using fault codes................................................................................. 44
Faults during use.....................................................................................................................................46
Checking installation and function ...........................................................................................................48
Taking out of service.................................................................................................................................... 49
Cleaning the level electrode......................................................................................................................... 50
Cleaning interval...................................................................................................................................... 50
Disposal ........................................................................................................................................................ 50
Returning decontaminated devices............................................................................................................. 50
EU Declaration of Conformity....................................................................................................................... 51

4NRG 26-60 - Installation & Operating Manual - 819875-00
Content of this Manual
Product:
NRG 26-60 level electrode
First edition:
BAN 819875-00/08-2019cm
© 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 NRG 26-60 level electrode
 1 x Sealing ring D 27 x 32, form D, DIN 7603-2.4068, bright annealed
 1 x Installation & Operating Manual

5NRG 26-60 - Installation & Operating Manual - 819875-00
How to use this Manual
This Installation & Operating Manual describes the correct use of the NRG 26-60 level electrode.
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 equipment 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
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

6NRG 26-60 - Installation & Operating Manual - 819875-00
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.
CAN (Controller Area Network) bus
Data transmission standard and interface for connecting electronic equipment,sensors and control systems.
Data can be sent and received.
NRG .. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG, see page 9.
SELV
Safety Extra Low Voltage
Operating point (of the system)
The operating point describes the operating parameters at which a system or boiler is operated in the
nominal range. In a steam boiler, for example, these would be the parameters output, pressure and
temperature.
The design data may be much higher, however.
A boiler operated at 10 bar and 180 °C, for example, may be designed for 60 bar of pressure and a tem-
perature of 275 °C, meaning that this does not have to be the operating point.

8NRG 26-60 - Installation & Operating Manual - 819875-00
Usage for the intended purpose
Use as a water level controller
The level electrode NRG 26-60 can be used together with a NRR 2-60 / NRR 2-61 level controller to con-
tinuously measure the water level in steam and water boilers, or in condensate and feedwater tanks.
 Together with the NRR 2-60 / NRR 2-61 level controller, the electrode is used as a water level control-
ler with MIN/MAX alarm.
Influences of the measured medium
 The NRG 26-60 level electrode can be used in media with varying conductivity. Conductivities of less
than 100 µS/cm can heavily influence the measured capacity, however. As a result, it is very important
to recalibrate the measurement range see page 38 at the operating point* after a cold start.
* Operating point of the system, see page 7.
 In order to achieve the greatest possible degree of reproducibility and maintain the measurement
quality (see “Technical data” on page 15), it is necessary to install the sensor in a protective tube
(see “Installation examples with dimensions” on page 25).
 The dielectric constant of the measured medium may require an adjustment to the measurement
frequency if it deviates significantly from the usual water (Er = 80). Please contact GESTRA Service.
Visualisation and operation
 Visualisation and operation take place using the URB 60 or SPECTOR
control operating terminal.
Applicable directives and standards
The NRG 26-60 level electrode has been tested and approved for use in the scope governed by the
following directives and standards:
Directives:
 Directive 2014/68/EU EU Pressure Equipment Directive
 Directive 2014/35/EU Low Voltage Directive
 Directive 2014/30/EU EMC Directive
 Directive 2011/65/EU RoHS II Directive
Standards:
 EN 60730-1 Automatic electrical controls – Part 1:
General requirements
Standards documents:
 VdTÜV Bulletin BP WASS 0100-RL
Requirements for water level control and limiting equipment

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Usage for the intended purpose
Admissible system components
In accordance with EU Pressure Equipment Directive 2014/68/EU and the technical rules of VdTÜV Bulletin
BP WASS 0100-RL, the level electrode can be operated with the following system components.
Level control and
limiter electrode
Control unit as level controller and
limit indicator Operating unit
NRG 26-60 NRR 2-60
NRR 2-61
URB 60,
SPECTOR
control
Fig. 1
Key to Fig. 1:
NRG = level electrode
NRR = level controller, continuous
URB = visual display and operating unit
To ensure the proper use of equipment during all types of use, you must also read the Installa-
tion & Operating Manuals for the system components used.
 You will find the current operating instructions for the system components named in Fig. 1
on our website:
http://www.gestra.com/documents/brochures.html
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.
Do not bring any equipment into service that does not have its own specific name plate.
The name plate indicates the technical features of the equipment.

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Danger to life from scalding if the level electrode is removed under pressure. Steam or
hot water can spurt forcefully out of the equipment.
 Only remove the level electrode at 0 bar boiler pressure.
Risk of severe burns when working on level electrodes that have not been allowed to
cool. Level electrodes become very hot during operation.
 Always allow level electrodes to cool.
 Perform all installation and maintenance work only on a level electrode that has been
allowed to cool.
There is a risk of electric shock during work on electrical systems.
 Always switch off the voltage to the system before performing connection work.
 Check that the system is not carrying live voltage before commencing work.
Danger to life from faulty NRG 26-60 level electrode due to the sudden escape of hot
steam or hot water.
Impacts during transport or installation can lead to damage or leaks on the NRG 26-60 level
electrode, causing pressurised hot steam or hot water to escape through the pressure relief
hole.
 Avoid damage during transport or installation, such as from impacts on the electrode rod.
 Before and after installation, check that the level electrode is completely undamaged.
 When bringing the level electrode into service, check that it is tight.
Attempts to repair the equipment will cause the system to become unsafe.
 The NRG 26-60 level electrode may only be repaired by the manufacturer, GESTRA AG.
 Only replace faulty equipment with identical equipment from GESTRA AG.
Basic safety notes