GESTRA LRGT 16-3 Manuale utente
Original Installation &
Operating Manual
Conductivity Transmitter
LRGT 16-3
LRGT 16-4
LRGT 17-3
850689-00
EN (USA)
English
2LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Contents
Content of this Manual........................................................................................................................ 4
Scope of supply, 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 information ................................................................................................................... 10
Required personnel qualifications.................................................................................................... 11
Notes on product liability.................................................................................................................. 11
Function ............................................................................................................................................. 12
Technical data ................................................................................................................................... 14
Rating plate, identification................................................................................................................ 17
Default factory settings..................................................................................................................... 19
Overall view ....................................................................................................................................... 20
LRGT 16-3.................................................................................................................................... 20
LRGT 16-4.................................................................................................................................... 20
LRGT 17-3.................................................................................................................................... 20
Dimensions of the LRGT 16-3............................................................................................................ 22
Dimensions of the LRGT 16-4............................................................................................................ 23
Dimensions of the LRGT 17-3............................................................................................................ 24
Preparing for installation ................................................................................................................. 25
Installation......................................................................................................................................... 26
Montage ............................................................................................................................................. 27
Additional notes for installation..................................................................................................... 27
Installing the LRGT 1x-x................................................................................................................ 28
Installation examples with dimensions............................................................................................ 29
Conductivity measurement ........................................................................................................... 29
Conductivity monitoring and continuous blowdown control ........................................................... 30
Conductivity monitoring and continuous blowdown control via a separate level pot....................... 31
Aligning the terminal box.................................................................................................................. 32
3LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Contents
Content of this Manual........................................................................................................................ 4
Scope of supply, 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 information ................................................................................................................... 10
Required personnel qualifications.................................................................................................... 11
Notes on product liability.................................................................................................................. 11
Function ............................................................................................................................................. 12
Technical data ................................................................................................................................... 14
Rating plate, identification................................................................................................................ 17
Default factory settings..................................................................................................................... 19
Overall view ....................................................................................................................................... 20
LRGT 16-3.................................................................................................................................... 20
LRGT 16-4.................................................................................................................................... 20
LRGT 17-3.................................................................................................................................... 20
Dimensions of the LRGT 16-3............................................................................................................ 22
Dimensions of the LRGT 16-4............................................................................................................ 23
Dimensions of the LRGT 17-3............................................................................................................ 24
Preparing for installation ................................................................................................................. 25
Installation......................................................................................................................................... 26
Montage ............................................................................................................................................. 27
Additional notes for installation..................................................................................................... 27
Installing the LRGT 1x-x................................................................................................................ 28
Installation examples with dimensions............................................................................................ 29
Conductivity measurement ........................................................................................................... 29
Conductivity monitoring and continuous blowdown control ........................................................... 30
Conductivity monitoring and continuous blowdown control via a separate level pot....................... 31
Aligning the terminal box.................................................................................................................. 32
Functional elements.................................................................................................................... 33
Electrical connection.......................................................................................................................... 34
Notes on electrical connection ....................................................................................................... 34
Connecting the 24V DC power supply ........................................................................................... 34
Connecting the actual value output (4 - 20mA).............................................................................. 34
Pin assignment of the M12 connector for non pre-wired control cables ......................................... 34
Bringing into service .......................................................................................................................... 35
Change the default settings if necessary........................................................................................ 35
Changing the cell constant............................................................................................................. 38
Changing the temperature coefficient ............................................................................................ 39
Using the “CAL” feature ................................................................................................................. 39
Using the “FiLt” feature.................................................................................................................. 40
Changing the scale of the 4 - 20mA actual value output ............................................................... 40
Changing the display unit (µS/cm or ppm)...................................................................................... 41
Manually initiating a display test.................................................................................................... 41
Comparing the reading with the reference reading from a reliable sample ..................................... 42
Starting, operation and testing .......................................................................................................... 43
System malfunctions.......................................................................................................................... 46
Causes .......................................................................................................................................... 46
Display of system malfunctions using error codes.......................................................................... 47
Faults that do not provoke a shutdown........................................................................................... 49
Checking installation and function ................................................................................................. 50
Taking out of service, removal........................................................................................................... 51
Cleaning the measuring electrodes of the conductivity transmitter................................................ 52
Monthly comparison of readings.................................................................................................... 52
Cleaning interval............................................................................................................................ 52
Disposal .............................................................................................................................................. 53
Returning decontaminated equipment.............................................................................................. 53
UL components................................................................................................................................... 53
4LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Content of this Manual
Product:
■ Conductivity Transmitter LRGT 16-3
■ Conductivity Transmitter LRGT 16-4
■ Conductivity Transmitter LRGT 17-3
First edition:
BAN 850689/08-2021cm
© 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 supply, product package
■ 1 x Conductivity transmitter LRGT 1x-x
■ 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 cable jack Binder series 713 99-0436-58-05
5LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
How to use this Manual
This Installation & Operating Manual describes the correct use of LRGT 16-3, LRGT 16-4 and LRGT
17-3 conductivity transmitters, abbreviated below as LRGT 1x-x. It applies to persons who inte-
grate 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 Installa-
tion & 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 acces-
sible 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 - USA - Installation & Operating Manual - 850689-00
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 - USA - Installation & Operating Manual - 850689-00
Specialist terms, abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
LRGT .. / LRR .. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG.
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 output, pressure,
and temperature.
The design data may be a lot more stringent, however.
A boiler that is operated at 145psi (10bar) and 356°F (180°C) may be designed to withstand a
pressure of 870psi (60bar) and a temperature of 527°F (275°C), for example, which is therefore
not necessarily its operating point.
8LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Usage for the intended purpose
LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters can be used as conductivity
limiters and blowdown controllers to continually measure conductivity in steam boilers and hot
water installations. They present a linear profile of conductivity in a preset measuring range via
a 4-20mA current output. The LRGT 1x-x is classified as operating control in accordance with
UL60730-1.
■ The transmitter’s secure 4 - 20mA actual value output can be used with a suitable conductivi-
ty controller, for example as a continuous blowdown controller with MIN/MAX alarm.
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:
Standards:
■ UL 60730-1 and CAN/CSA E60730-1
General Requirements for Automatic Electrical Controls.
9LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Usage for the intended purpose
Admissible system components
According to UL60730-1, the LRGT conductivity electrode can be regarded as part of an operating
control, which delivers the measured conductivity via the 4 - 20mA output. Any
diagnostic tester
with an input for a 4 - 20mA unit signal can be connected and used for analysis.
To ensure proper use in all applications, 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
Improper use
There is a danger of death due to explosion if the equipment is used in potentially
explosive 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 - USA - Installation & Operating Manual - 850689-00
Basic safety information
Danger to life from scalding! Do not remove the conductivity electrode under
pressure. Steam or hot water can spurt forcefully out of the equipment.
■ Only remove the conductivity electrode at 0psi (0bar) boiler pressure.
Risk of severe burns! Do not perform work on a conductivity electrode that is still
hot. The conductivity electrode gets very hot during operation.
■ Always allow the conductivity electrode to cool.
■ Only perform installation and maintenance work after the conductivity electrode has
been allowed to cool down.
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! Hot steam or hot water can suddenly escape from a faulty
LRGT 1x-x conductivity electrode.
Shocks and impacts during transport or installation can result in damage to or leaks in
the conductivity electrode, causing pressurized 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 leak-tight.
Attempts to repair the equipment will cause the plant to become unsafe.
■ LRGT 1x-x conductivity electrodes may only be repaired by the manufacturer,
GESTRA AG.
■ Only replace faulty equipment with identical equipment from GESTRA AG.
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