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.

7NRG 26-60 - Installation & Operating Manual - 819875-00
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

9NRG 26-60 - Installation & Operating Manual - 819875-00
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.

10 NRG 26-60 - Installation & Operating Manual - 819875-00
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

11NRG 26-60 - Installation & Operating Manual - 819875-00
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical
connection/bringing into service Specialist staff
The unit is an item of equipment with a
safety function (EU Pressure Equipment
Directive) and may only be brought into
service by suitable, trained staff.
Operation Boiler service technician Staff trained by the plant operator.
Maintenance work Specialist staff
Maintenance and conversions may only be
performed by authorised staff who have
undergone specific training.
Conversions Specialist staff Persons trained by the plant operator to work
with pressure and temperature.
Fig. 2
Notes on product liability
We the manufacturer cannot accept any liability for damages resulting from improper use of the equip-
ment.

12 NRG 26-60 - Installation & Operating Manual - 819875-00
Function
The NRG 26-60 level electrode functions according to capacitive measurement and converts the fill level
information into a data telegram. The measurement range of 0 - 100 % is scalable along the effective
length of the electrode rod.
Automatic self-test
An automatic self-test cyclically monitors the safety and function of the level electrode and measured
value recorder.
Faults in the electrical connection or electronic measuring equipment trigger error signals and alarms.
The data are transferred to the NRR 2-6x level controller via an ISO 11898 CAN bus in the CANopen
protocol.
These data telegrams contain the following information:
 Measured level value as raw data
 Measured level value scaled between 0 – 100 %, as a 16-bit data word in high resolution
 Measure level value scaled in 1 % stages without decimal places
 Status or error information
 Error signals in the event of faults in electronic or mechanical parts
 Temperature in the level electrode terminal box
Controller functions
The NRG 26-60 level electrode can be used together with a NRR 2-60 / NRR 2-61 level controller as
a water level controller. The controller is parametrised exclusively using the URB 60 visual display and
operating unit.
The alarm limits are set using the URB 60. Read the relevant Installation & Operating Manual.
For information on how the alarm contacts function, please read the Installation & Operating
Manual of the corresponding NRR 2-60 or NRR 2-61 level controller.
The level electrode is installed inside steam boilers, tanks or feed lines of water boilers. A protective tube
provided on site keeps it functioning reliably (see page 25 “Installation examples”).
A capacitive NRG 26-60 level electrode can be installed in a protective tube or level pot together with an
NRG 1x-60 or NRG 1x-61 level electrode.
Operation in external level pots
If a level electrode is installed in a lockable level pot outside the boiler, the connecting pipes must be
flushed regularly.
If the steam pipe is ≥ 40 mm and the water pipe is ≥ 100 mm, installation is regarded as internal. In this
case, upstream monitoring of flushing processes is not required.

13NRG 26-60 - Installation & Operating Manual - 819875-00
Function
Display and signals, see page 41 / 43 *
The NRG 26-60 level electrode has a 4-digit green 7-segment display for showing measured values and
status information, along with the fault codes. A red and green LED indicate the operating status.
Behaviour upon activation *
The display alternately shows the software version, the type and then the scaled level value.
Behaviour in normal operation (no alarm, no faults) *
The display shows the scaled level value (3-digit + 1 decimal place), e.g. 050.3, and sends CAN data tele-
grams with the level information to be evaluated or displayed by the bus nodes.
The scaling of the measurement 0 – 100 % is set ex-works at a maximum for the
corresponding electrode length. This enables effective level measurements immediately
after installation.
Adjusting the measurement range while bringing into service (CAL.L, CAL.P or CAL.H)
The measurement range should be adjusted to the level of the sight glass while bringing into
service, using the parameters CAL.L, CAL.P or CAL.H, see page 38 - 39. This is the only
way to gain all the benefits of a high measurement resolution in the sight glass.
Behaviour in the event of an alarm (level value above or below limit) *
The scaled level value is transferred by CAN data telegram to the level controller NRR 2-60 or NRR 2 61.
Depending on how the alarm limit values are set in the level controller, an alarm is generated after the
delay time has elapsed.
Behaviour in the event of faults *
A fault code, e.g. E.005, appears permanently in the display. See page 44 for fault codes.
The faulty state is transferred by CAN data telegram to the level controller NRR 2-60 or NRR 2-61. Here,
the fault message triggers an immediate alarm. For information about how the display and contacts work,
see the “System malfunctions” section of the Installation and Operation Manual of the NRR 2-60 or
NRR 2-61.
Alarms and faults in the electrode cannot be acknowledged.
When the alarm or fault is cancelled, the message in the display also disappears. The NRR
2-60 / NRR 2-61 level controller returns to normal operation.
* A detailed allocation between the respective device status, the display and the
alarm LEDs can be found in the tables on pages 41 - 42.

14 NRG 26-60 - Installation & Operating Manual - 819875-00
Parametrising/changing the factory settings.
You can adjust the electrode’s parameters to the on-site system conditions if necessary. You can adjust
the parameters or change the factory settings using a rotary knob on the terminal box, see page 34 ff.
Function

15NRG 26-60 - Installation & Operating Manual - 819875-00
Technical data
Model and mechanical connection
 Thread G¾ A, EN ISO 228-1, see Fig. 6
Nominal pressure rating, admissible service pressure and temperature
 PN 40 32 bar (g) at 238 °C
Materials
 Terminal box: 3.2581 G AlSi12, powder-coated
 Sheath: 1.4301 X5 CrNi 18-10
 Electrode rod insulation: PTFE
 Screw-in body: 1.4571, X6CrNiMoTi17-12-2
pH value
 Maximum admissible = 10
Max. installed length at 238 °C, all measurements in mm
Max installed length: 373 477 583 688 794 899 1004
Measuring range: 300 400 500 600 700 800 900
Max installed length: 1110 1214 1319 1423 1528 1636 2156
Measuring range: 1000 1100 1200 1300 1400 1500 2000
The electrode rod must not be shortened.
Measurement quality
The following information applies for a fluid conductivity range of 100 – 10000 µS/cm compensated to 25 °C.
 Measured value deviation: +/- 1 % from the set measurement range in the operating point
 Display measured value resolution: 0.1 %
 Internal processing resolution: 15 bit with sign (16 bit)
Supply voltage
 24 V DC +/-20 %
Power consumption
 max. 7 VA

16 NRG 26-60 - Installation & Operating Manual - 819875-00
Technical data
Current input
 max. 0.3 A
Internal fuse
 T 2 A
Safety cutout at excessive ambient temperature
 The cutout at excessive ambient temperatures takes place at Tamb. = 75 °C
Input/output
 Interface for CAN bus to ISO 11898, CANopen, insulated
 M12 CAN bus connector, 5-pole, A-coded
 M12 CAN bus socket, 5-pole, A-coded
Indicators and controls
 1 x 4-digit green 7-segment display for showing status information
 1 x red LED for indicating an alarm
 1 x green LED for indicating OK
 1 x rotary knob IP65 with button for menu navigation and test function
Protection class
 III Safety Extra Low Voltage (SELV)
IP rating to EN 60529
 IP 65
Admissible ambient conditions
 Service temperature: 0 °C – 70 °C
 Storage temperature: - 40 °C – 80 °C
 Transport temperature: - 40 °C – 80 °C
 Air humidity: 10 % – 95 % non-condensing
Weight
 Approx. 2.1 kg
Admissible installation positions
 Vertical
 Oblique to a maximum inclination of 45°. The length of the electrode rod is limited to 688 mm maximum.

17NRG 26-60 - Installation & Operating Manual - 819875-00
Name plate/Identification
The date of production is stamped on the screw-in body of every level electrode.
Power consumption
Safety
note
Equipment designation
Nominal pressure rating,
connection thread,
screw-in body material
Equipment
function
Admissible service pressure,
admissible temperature
Admissible ambient
temperature
Current
approval
Manufacturer
Serial number
IP rating
Supply voltage
CE marking
Appointed authority
Disposal information
Protection class
Fig. 3
Measuring range
Data interface
Betriebsanleitung
beachten
See installation instructions
Voir instructions de
montage
GESTRA AG
Münchener Str.77
28215 Bremen
GERMANY
TÜV. xx . xx-xxx
NRG 26 - 60
Niveauelektrode
Level electrode
Électrode de niveau
70°C (158 °F)T
PmaxPmax
TmaxTmax
PN40 G3/4 1.4571 IP65
32 bar (464psi)
238°C (460°F)
7VA
H= mm
IN/OUT: CAN-Bus
V 20%24 ±

18 NRG 26-60 - Installation & Operating Manual - 819875-00
Factory settings
The NRG 26-60 level electrode is delivered ex-works with the following settings:
Parameter Display in
menu
Parameter values
Unit
NRG 26-60
Controller group GrP 0001 - - -
Baud rate bd.rt 0050 KBit/s
Lower bound calibration CAL.L variable 0 %
Raw value (hex)
approx. 50 mV
at ADC
Measurement range section calibra-
tion CAL.P variable 25 % Raw value (hex)
Upper bound calibration CAL.H variable 100 %
Raw value (hex)
approx. 2.0 V at
ADC
Filter constant FiLt 0005 Seconds
Compatibility mode ConP oFF - - -
Fig. 4

19NRG 26-60 - Installation & Operating Manual - 819875-00
OK
!
+
-
Overall view of the NRG 26-60
Fig. 5
A Terminal box
B Operating panel with 4-digit LED display/alarm
LEDs and rotary knob, see page 41
C Cover screws M4 x 16 mm
D M12 CAN bus socket, 5-pole, A-coded
E M12 CAN bus connector, 5-pole, A-coded
G Seal seat for sealing ring
J Electrode
H Sealing ring D 27 x 32, form D, DIN 7603-2.4068,
bright annealed
F Sheath (simplified representation)
I Electrode thread
K PTFE electrode rod insulation

20 NRG 26-60 - Installation & Operating Manual - 819875-00
Dimensions of the NRG 26-60
1 2
Max.
installed length
at 238 °C
Measuring
range
373 300
477 400
583 500
688 600
794 700
899 800
1004 900
1110 1000
1214 1100
1319 1200
1423 1300
1528 1400
1636 1500
2156 2000
OK
!
+
-
140
G ¾
Fig. 6
Size 41
All lengths and diameters
in mm
0
Nm
50 70 90
110
120 100 80 60
41
175
b = 70
26 237
1 338
20
Thermal
insulation
provided on site
Ø15