GESTRA NRG 26-60 Installation instructions

Installation & Operating Manual
EN
English
Level Electrode
NRG 26-60
819875-01

2NRG 26-60 - Installation & Operating Manual - 819875-01
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
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
Example 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 by detaching a terminal box ..................................................... 24
Installation examples with dimensions....................................................................................................... 27
Aligning the terminal box............................................................................................................................. 32
Functional elements..................................................................................................................................... 33
Connecting the CAN bus system.................................................................................................................. 34
Bus line, cable length and cross-section .................................................................................................. 34
Example .................................................................................................................................................. 34
Important notes on connecting the CAN bus system................................................................................. 35
Pin assignment of the CAN bus connector and coupling for non pre-wired control cables......................... 35

3NRG 26-60 - Installation & Operating Manual - 819875-01
Contents
Bringing into service .................................................................................................................................... 36
Changing the factory settings if necessary............................................................................................... 36
Changing parameters with password protection enabled ......................................................................... 36
Notes on changing the communication parameter “GrP or bd.rt”.............................................................. 39
Changing the controller group “GrP” ........................................................................................................ 39
Changing the baud rate “bd.rt”................................................................................................................ 40
Calibrating the lower limit of the active measuring range “CAL.L” (0% calibration value).......................... 40
Independent rapid calibration at a water level of > 25% of the active measuring range “CAL.P”.............. 41
Calibrating the upper limit of the active measuring range “CAL.H” (100% calibration value)..................... 41
Setting the filter constant “Filt”................................................................................................................ 41
Manually initiating a display test .............................................................................................................. 42
Activating URB 2 compatibility “ConP”..................................................................................................... 42
Viewing the software version and equipment type “Info”.......................................................................... 42
Enabling/disabling password protection ................................................................................................... 43
Check the MIN and MAX limit values of the NRR 2-6x level controller by raising or lowering the level ...... 44
Starting, operation and testing .................................................................................................................... 45
System malfunctions.................................................................................................................................... 47
Causes .................................................................................................................................................... 47
Indication of system malfunctions using error codes................................................................................ 48
Common application and usage errors..................................................................................................... 50
Checking installation and function ........................................................................................................... 52
Taking out of service/Disassembly.............................................................................................................. 53
Cleaning the level electrode......................................................................................................................... 54
Cleaning interval...................................................................................................................................... 54
Disposal ........................................................................................................................................................ 54
Returning decontaminated equipment........................................................................................................ 54
Declaration of Conformity; Standards and Directives................................................................................. 55

4NRG 26-60 - Installation & Operating Manual - 819875-01
Content of this Manual
Product:
Level Electrode NRG 26-60
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 level electrode NRG 26-60
■ 1 x sealing ring D 27 x 32, form D, DIN 7603-2.4068, bright annealed
■ 1 x Installation & Operating Manual
Accessories
■ 1 x M12 CAN bus connector, 5-pole, A-coded, with 120 Ω terminating resistor

5NRG 26-60 - Installation & Operating Manual - 819875-01
How to use this Manual
This Installation & Operating Manual describes the correct use of the NRG 26-60 level electrode.
It applies to all persons who integrate this equipment into control systems, install, bring into service, op-
erate, 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 given.
■ 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 that the 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
+
-
Press the rotary knob

6NRG 26-60 - Installation & Operating Manual - 819875-01
Types of warning
DANGER
Warning of a dangerous situation that will result 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 will result in damage to property or the environment.

7NRG 26-60 - Installation & Operating Manual - 819875-01
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 plant)
The operating point describes the operating parameters within which a plant or boiler is operated in its
nominal range. In a steam boiler, for example, these parameters would be pressure and temperature.
The pressure at the operating point does not have to match the design pressure, but is the same or lower.

8NRG 26-60 - Installation & Operating Manual - 819875-01
Usage for the intended purpose
Use as a water level controller
The NRG 26-60 level electrode can be used together with an NRR 2-60/NRR 2-61 level controller to
continuously measure the water level in steam boiler and hot water installations or in condensate and
feedwater tanks.
■ In combination with the NRR 2-60/NRR 2-61 level controller, the electrode can be used as a level
control system with MIN/MAX alarm, for example.
Influence of the fluid to be monitored
■ The NRG 26-60 level electrode can be used in fluids with different conductivity. However, a conduc-
tivity of less than 100 µS/cm has a major influence on the measured capacitance, which is why it is
extremely important to recalibrate the measuring range at the operating point* when bringing into
service.
* Operating point of the plant,see page 7.
■ To achieve the best possible reproducibility and maintain high-quality measurements (see “Technical
data” on page 15), the sensor must be installed in a protective tube (see “Installation examples with
dimensions” on page 27 ff.).
■ The dielectric constant of the monitored medium may require an adjustment to the measurement
frequency if it deviates significantly from the usual water (Er = 80). Please contact GESTRA Service for
this.
Visual display and operation
■ Visual display and operation take place using the URB 60 or SPECTOR
control
operating terminal.

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Usage for the intended purpose
Admissible system components
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 proper the proper use of equipment during all types of use, please also read the
Installation & Operating Manuals for the system components used.
■ You will find the latest Installation & Operating Manuals for the system components named
in Fig. 1 on our website:
www.gestra.com
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 a boiler pressure of 0 bar.
Risk of severe burns if work is performed on a level electrode that has not been allowed
to cool. The level electrode becomes very hot during operation.
■ Always allow level electrodes to cool.
■ Perform all installation and maintenance work only when the level electrode has been
allowed to cool.
There is a risk of electric shock during work on electrical systems.
■ Always switch off the voltage to the plant before performing connection work.
■ Check that the plant is not carrying live voltage before commencing work.
Danger to life from a faulty NRG 26-60 level electrode due to the sudden escape of
hot steam or hot water.
Jolts and impacts during transport or installation can result in damage to or leaks in the NRG
26-60 level electrode, causing pressurised hot steam or hot water to escape through the pres-
sure relief hole.
■ To prevent damage during transport and installation, do not expose the electrode
rod to major jolts or impacts.
■ Before and after installation, check that the level electrode is completely undamaged.
■ Check that the level electrode is not leaking when bringing into service.
Attempts to repair the equipment will cause the plant 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