GESTRA LRGT 16-3 Istruzioni per l'installazione
Original Installation &
Operating Manual
Conductivity Transmitter
LRGT 16-3
LRGT 16-4
LRGT 17-3
819877-00
EN
English
2LRGT 1x-x - Installation & Operating Manual - 819877-00
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, dependent on the required safety level....................................................9
Improper use .................................................................................................................................................. 9
Basic safety information .............................................................................................................................. 10
Required personnel qualifications............................................................................................................... 11
Notes on product liability............................................................................................................................. 11
Functional safety, safety integrity level (SIL) .............................................................................................. 12
Check the secure current output regularly................................................................................................12
Reliability data to EN 61508 ......................................................................................................................... 13
Function ........................................................................................................................................................ 14
Technical data .............................................................................................................................................. 16
Name plate/Identification ............................................................................................................................ 19
Factory settings............................................................................................................................................ 21
Overall view .................................................................................................................................................. 22
LRGT 16-3...............................................................................................................................................22
LRGT 16-4...............................................................................................................................................22
LRGT 17-3...............................................................................................................................................22
Overall view .................................................................................................................................................. 23
Dimensions of the LRGT 16-3....................................................................................................................... 24
Dimensions of the LRGT 16-4....................................................................................................................... 25
Dimensions of the LRGT 17-3....................................................................................................................... 26
Installation.................................................................................................................................................... 27
Additional notes for installation................................................................................................................ 28
Example, LRGT 16-3................................................................................................................................ 29
Installation examples with dimensions....................................................................................................... 31
Conductivity measurement ......................................................................................................................31
Conductivity monitoring and continuous blowdown control ......................................................................32
Conductivity monitoring and continuous blowdown control via a separate level pot.................................. 33
Key for Fig. 12 to Fig. 14.......................................................................................................................... 34
3LRGT 1x-x - Installation & Operating Manual - 819877-00
Contents
Aligning the terminal box............................................................................................................................. 34
Functional elements..................................................................................................................................... 35
Electrical connection.................................................................................................................................... 36
Notes on electrical connection .................................................................................................................36
Connecting the 24V DC power supply ......................................................................................................36
Connecting the actual value output (4-20 mA)..........................................................................................36
Pin assignment of the M12 connector for non pre-wired control cables ...................................................36
Bringing into service .................................................................................................................................... 37
Changing the factory settings if necessary............................................................................................... 37
Changing the cell constant....................................................................................................................... 40
Changing the temperature coefficient ...................................................................................................... 41
Using the “CAL” function..........................................................................................................................41
Using the “FiLt” feature............................................................................................................................42
Changing the scale of the 4-20 mA actual value output ...........................................................................42
Changing the display unit (µS/cm or ppm)................................................................................................ 43
Manually initiating a display test.............................................................................................................. 43
Comparing the reading with the reference reading from a reliable sample ............................................... 44
Starting, operation and testing .................................................................................................................... 45
System malfunctions.................................................................................................................................... 48
Causes ....................................................................................................................................................48
Indication of system malfunctions using fault codes................................................................................. 49
Faults that do not provoke a shutdown.....................................................................................................51
Checking installation and function ...........................................................................................................52
Taking out of service/Disassembly.............................................................................................................. 53
Cleaning the measuring electrodes of the conductivity transmitter.......................................................... 54
Monthly comparison of readings .............................................................................................................54
Cleaning interval...................................................................................................................................... 54
Disposal ........................................................................................................................................................ 55
Returning decontaminated equipment........................................................................................................ 55
EU Declaration of Conformity....................................................................................................................... 55
4LRGT 1x-x - Installation & Operating Manual - 819877-00
Content of this Manual
Product:
Conductivity Transmitter LRGT 16-3
Conductivity Transmitter LRGT 16-4
Conductivity Transmitter LRGT 17-3
First edition:
BAN 819877-00/09-2019cm
© Copyright
All rights reserved. Any misuse, particularly reproduction and dissemination to third parties, is not permitted.
The General Terms & Conditions of GESTRA AG apply.
Scope of delivery/Product package
1 x conductivity transmitter LRGT 1x-x
1 x sealing ring, D 33 x 39, form D, DIN 7603-2.4068, bright annealed
1 x Installation & Operating Manual
Required accessories for LRGT 16-3, LRGT 17-3 and LRGT 16-4 when installing for the first time
1 x cable jack, Hirschmann ELWIKA 5012
5LRGT 1x-x - Installation & Operating Manual - 819877-00
How to use this Manual
This Installation & Operating Manual describes how to correctly use LRGT 16-3, LRGT 16-4 and
LRGT 17-3 conductivity transmitters. 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
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
6LRGT 1x-x - Installation & Operating Manual - 819877-00
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.
7LRGT 1x-x - Installation & Operating Manual - 819877-00
Specialist terms/Abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
IEC 61508
International standard IEC 61508 describes both the type of risk assessment and actions taken to provide
appropriate safety functions.
SIL (safety integrity level)
Safety integrity levels SIL 1 to 4 are used to quantify risk reduction. SIL 4 is the highest level of risk reduction.
International standard IEC 61508 forms the basis for establishing, testing and operating technical safety
systems.
LRGT .. / LRR .. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG.
SELV
Safety Extra Low Voltage
Operating point (of the system)
The operating point describes the operating parameters at which a plant or boiler is operated in the
nominal range. In a pressurised steam plant, for example, these parameters would be output, pressure
and temperature.
The design data may be a lot more stringent, however.
A boiler that is operated at 10 bar and 180°C may be designed for a pressure of 60 bar and a tempera-
ture of 275°C, for example, which is not necessarily its operating point.
8LRGT 1x-x - Installation & Operating Manual - 819877-00
Usage for the intended purpose
LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters can be used as conductivity limiters and
continuous blowdown controllers to continually monitor conductivity in pressurised steam and hot-water
plants. They present a linear profile of conductivity in a preset measuring range via a 4-20mA current
output.
The transmitter’s secure 4-20 mA actual value output (SIL 2) can be used with a suitable conductivity
controller, as a continuous blowdown controller with MIN/MAX alarm, for example.
To ensure problem-free operation, pay attention to the requirements for water quality as specified in
the technical rules (TRD) and EN standards for pressurised steam plants.
The equipment may only be used within the admissible pressure and temperature ratings, see
“Technical data” on page 16 and “Name plate/Identification” on page 19.
Applicable directives and standards
LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters have 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
EN 61508 Functional safety of electronic systems
Standards documents:
VdTÜV Bulletin BP WÜ 0100-RL
Requirements for the testing of water monitoring equipment
Technical rules for pressurised steam plants - as a knowledge base:
This Manual occasionally refers to the TRD regulations as a knowledge base.
These regulations have not been in force since 1 March 2019 and are no longer updated.
They have been replaced by the TRBS (German Technical Rules for Industrial Health &
Safety).
Always observe the current regulations (EU directives, EN standards, information from emplo-
yers’ liability insurance associations, etc.) in order to comply with the current state of the art.
9LRGT 1x-x - Installation & Operating Manual - 819877-00
Usage for the intended purpose
Admissible system components, dependent on the required safety level
In accordance with EU Pressure Equipment Directive 2014/68/EU, standards EN12952, EN12953
and EN 61508 and the technical rules of VdTÜV Bulletin BP WÜ 0100-RL, the conductivity electrode can
be operated with safety integrity level SIL 2.
If a diagnostic tester that also has a SIL 2 rating is connected to the 4-20mA output, the entire event
chain system can be operated at this safety integrity level.
A diagnostic tester with a higher SIL rating does not increase the safety of the overall system.
The maximum achievable safety level is dictated by the lowest SIL rating of a participant in the
event chain as a whole.
Systems without SIL rating
In systems without a SIL rating, any controller, display unit or diagnostic tester with an input for a
standard 4-20 mA signal can be connected.
To ensure the proper use of equipment during 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 other system components 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 rating plate.
The rating plate indicates the technical features of the equipment.
10 LRGT 1x-x - Installation & Operating Manual - 819877-00
Basic safety information
Danger to life from scalding if the conductivity electrode is removed under pressure.
Steam or hot water can spurt forcefully out of the equipment.
Only remove the conductivity electrode at 0 bar boiler pressure.
Risk of severe burns when working on a conductivity electrodes that has not been
allowed to cool. The conductivity electrode becomes very hot during operation.
Always allow the conductivity electrode to cool.
Perform all installation and maintenance work only when the conductivity 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 LRGT 1x-x conductivity electrode due to the sudden escape of
hot steam or hot water.
Shocks and impacts during transport or installation can result in damage to or leaks in the con-
ductivity electrode, causing pressurised hot steam or hot water to escape through the pressure
relief hole.
To prevent damage during transport and installation, do not expose the electrode
rod to hard impacts.
Before and after installation, check that the conductivity electrode is undamaged.
When bringing the conductivity electrode into service, check that it is tight.
Attempts to repair the equipment will cause the plant to become unsafe.
The LRGT 1x-x conductivity electrode may only be repaired by the manufacturer, GESTRA AG.
Only replace faulty equipment with identical equipment from GESTRA AG.
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