GESTRA LRGT 16-3 User manual

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 24V DC power supply ........................................................................................... 34
Connecting the actual value output (4 - 20mA).............................................................................. 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 - 20mA 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 145psi (10bar) and 356°F (180°C) may be designed to withstand a
pressure of 870psi (60bar) 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-20mA current output. The LRGT 1x-x is classified as operating control in accordance with
UL60730-1.
■ The transmitter’s secure 4 - 20mA 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 - 20mA output. Any
diagnostic tester
with an input for a 4 - 20mA 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 0psi (0bar) 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.

11LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical connection/
bringing into service Specialist staff
The equipment may only be installed, wired
and brought into service by qualified and
competent staff.
Operation Boiler service technician Staff trained by the plant operator.
Maintenance work Specialist staff
Maintenance and refits may only be
performed by authorized staff who have
undergone specific training.
Refits Specialist staff Persons trained by the plant operator to work
with pressure and temperature.
Fig. 1
Notes on product liability
The manufacturer cannot accept any liability for damages resulting from improper use of the
equipment.
Basic safety information
A lack of proper maintenance and cleaning can result in damage to the conductivi-
ty electrode and/or false measurement results and warnings.
■ Once a year, check the conductivity electrode by performing reference
measurements. If the “CF” (cell constant) value of 003.0 is exceeded after recalibra-
tion, the warning code “CF.Hi” will appear.
■ Adhere to the maintenance and cleaning intervals, see page 52.

12 LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Function
The equipment measures the conductivity of electrically conductive fluids,and converts the information
into a conductivity-dependent 4 - 20mA current signal.
Measuring process of the LRGT 16-3 and LRGT 17-3
LRGT 16-3 and LRGT 17-3 conductivity transmitters use the conductometric two-electrode
measuring process. A measuring current with a suitable frequency for the measuring range is
introduced into the fluid. This produces a potential gradient between the electrode and the measur-
ing tube, which is analyzed as a measuring voltage.
Measuring process of the LRGT 16-4
The LRGT 16-4 conductivity transmitter uses the conductometric four-electrode measuring
process. It consists of two current and two voltage electrodes. The current electrodes introduce
a measuring current with a fixed frequency into the fluid. This gives rise to a potential gradient
between these electrodes. This potential gradient is then picked up by the voltage electrodes and
analyzed as measuring voltage.
Temperature compensation of readings based on a reference temperature (77°F (25°C))
The electrical conductivity changes as a function of the temperature. In order to base the readings
on a reference temperature, an integrated resistance thermometer measures the temperature
of the fluid. The electrical conductivity is calculated from the measuring current and measuring
voltage, and then based on the reference temperature of 77°F (25°C) through temperature
compensation.
Compensation process
Based on a set temperature coefficient, the conductivity reading is corrected to form a linear
characteristic. The coefficient (default 2.1% per °C) is normally used for steam generating units
with constant pressure. Conductivity is established for an ambient temperature of 77°F (25°C).
The displayed reading is then verified under operating conditions (service pressure and tempera-
ture) using a calibrated conductivity meter. If this figure deviates, the electrode must be calibrated.
See the section on bringing into service.
Transmitter function
The transmitter function is the ability of the electrode to provide a scalable measuring range on
the 4 - 20mA current output interface and to make this available to one or more recipients for
analysis.
These devices do not have any controlling or limiting functions.
Automatic self-test
An automatic self-test periodically monitors the safety and function of the conductivity transmitters
and measured value acquisition.
Faults in the electrical connection or electronic measuring equipment trigger an error code on the
display, and the current output is set to 0mA.

13LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Function
Indicators and signals, see page 43 / 47 *
LRGT 1x-x conductivity transmitters feature a green 4-digit, 7-segment display for showing read-
ings, status information and error codes. The operating status is indicated by one red and three
green LEDs.
Behavior when switched on *
The display alternately shows the software version, the type and then the measured conductivity.
Behavior in normal operation (no faults) *
The display shows the measured conductivity value (4 digits), e.g., 1550, and converts this value
into a current signal from 4 - 20mA, in accordance with the predefined measuring range (see
page 40, Sout parameter).
Behavior in the event of malfunctions *
The error state or malfunction is shown by an error code, e.g., E.005, on the display. For more on
error codes, see page 47/47.
Every time there is a malfunction, 0mA is output via the current output.
Electrode faults cannot be acknowledged.
When the fault is corrected, the error code of the conductivity transmitter also disappears
from the display and the LRGT 1x-x conductivity transmitter returns to normal operation.
Behavior when running the test function *
Initiating the test function by pressing the rotary knob on the LRGT 1x-x produces a maximum
output current of 20mA. This enables you to check the effect of limit violation on connected
diagnostic testers.
* The tables starting on page 43 clearly show the relationship between the equip-
ment status, the display and the status LEDs.
Setting parameters and changing default factory settings
If necessary, you can adapt the electrode parameters to suit conditions at the plant. Parameters
can be set and default settings changed using a rotary knob on the terminal box, see page 36.

14 LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Technical data
Design and mechanical connection
■ LRGT 16-3, LRGT 16-4, LRGT 17-3 Thread 1" - 11.5 NPT, see Fig. 7, 8 and 9
Nominal pressure rating, admissible service pressure and temperature
■ LRGT 16-3 464psi at 460°F (32bar at 238°C)
■ LRGT 16-4 464psi at 460°F (32bar at 238°C)
■ LRGT 17-3 870psi at 527 °F (60bar at 275 °C)
Materials
■ Terminal box 3.2581 G AlSi12, powder-coated
■ Cover tube 1.4301 X5 CrNi 18-10
■ Measuring electrodes 1.4571 X6CrNiMoTi17-12-2
■ Electrode insulation PTFE
■ Screw-in body: 1.4404 / F316L
◆ Measuring tube/screw of
LRGT 16-3, LRGT 17-3 1.4571, X6CrNiMoTi17-12-2
◆ Spacer of
LRGT 16-3, LRGT 16-4, LRGT 17-3 PEEK
Available electrode lengths (cannot be cut)
■ LRGT 16-3, LRGT 17-3 7.87/11.81/15.75/19.69/23.62/31.49/39.37inch
(200, 300, 400, 500, 600, 800, 1000mm)
■ LRGT 16-4 7.08/11.81/14.36/19.59/23.62/31.49/39.37inch
(180, 300, 380, 500, 600, 800, 1000mm)
Temperature sensor
■ Resistance thermometer Pt1000
■ Fluid temperature measuring range 0 to 536°F (0 to 280°C)
Conductivity range at 25°C
■ LRGT 16-3, LRGT 17-3 0.5 μS/cm to 6000 μS/cm, 0.25 - 3000 ppm *
◆ Preferred measuring range up to 500 ppm (1000 µS/cm)
■ LRGT 16-4 50 μS/cm to 10,000 μS/cm, 25 - 5000 ppm *
◆ Preferred measuring range from 250 ppm (500 µS/cm)
* Conversion of µS/cm to ppm (parts per million): 1 μS/cm = 0.5 ppm
Measuring cycle
■ 1 second

15LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Technical data
Measurement quality (figures for value ranges between the on-site calibration points)
■ LRGT 1x-3
Resolution for internal processing *
Measurement error Linearity error
◆ Range 1: 0.25-5 ppm (0.5-10 µS) 7% 2%
◆ Range 2: 5-125 ppm (10-250 µS) 3% 2%
◆ Range 3: 125-1300 ppm (250-2600 µS) 3% 1%
◆ Range 4: 1300-10500 ppm (2600-21000 µS) 3% 1%
■ LRGT 16-4
Resolution for internal processing *
Measurement error Linearity error
◆ Range 1: 5-50 ppm (10-100 µS) 2% 2%
◆ Range 2: 50-1000 ppm (100-2000 µS) 2% 1.5%
◆ Range 3: 1000-25000 ppm (2000-50000 µS) 2% 1%
* Resolution for internal processing based on 15 bits with plus or minus sign (16 bits).
The above figures refer to the uncompensated conductivity.
Time constant “T” (measured using the two-bath process)
Temperature Conductivity
■ LRGT 16-3, LRGT 17-3 9 seconds 14 seconds
■ LRGT 16-4 11 seconds 19 seconds
Temperature compensation
■ The temperature compensation process is linear and set via parameter tC, see page 39.
Supply voltage
■ 24 V DC +/-20% SELV / PELV / CLASS2
Power consumption
■ Max. 7 VA
Current draw
■ Max. 0.35 A
Internal fuse
■ T2A (slow blow)
Safety cutout at excessive ambient temperature
■ The cutout takes place at an excessive ambient temperature of Tamb. = 167°F (75°C)
Electrode voltage
■ < 500 mV (RMS) at no load

16 LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Technical data
Analog output
■ 1 x actual value output 4 - 20mA
■ Max. output load 500 Ω
■ M12 connector, 5-pole, A-coded
Indicators and controls
■ 1 x green 4-digit 7-segment display for showing readings and status information
■ 1 x red LED for indicating the error state
■ 3 x green LEDs for indicating the unit μS/cm or ppm and OK status
■ 1 rotary knob IP65 with button for menu navigation and test function
Protection class
■ III Safety Extra Low Voltage (SELV / PELV / CLASS2)
Protection
■ NEMA type 3R, 3RX and 5; IP 65 according to NEMA 60529
Admissible ambient conditions
■ Service temperature: -32°F –158°F (-40°C – 70°C)
■ Storage temperature: -40°F – 158°F (-40°C – 80°C)
■ Transport temperature: -40°F – 158°F (-40°C – 80°C)
■ Air humidity: - 10% – 95%, non-condensing
Weight
■ LRGT 16-3, LRGT 16-4, LRGT 17-3 approx. 4.63lb (2.1kg)
Other information
■ Independently mounted Type 1 action operating control
■ Pollution degree 2, impulse voltage 330V

17LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Rating plate, identification
Protection
Supply voltage
CE marking
Notified body
Disposal information
Protection class
Fig. 3
The date of production (quarter and year) is stamped on the screw-in body of each
conductivity transmitter.
Power consumption
Safety
note
Equipment designation
Equipment function
Nominal pressure rating,
connection thread,
material of
screw-in body
Currently valid
approval
Manufacturer
Serial number
Admissible service pressure,
admissible temperature
Admissible ambient
temperature
Measuring range
Safety integrity level (SIL)
Data interface
Betriebsanleitung
beachten
See installation instructions
Voir instructions de
montage
LRGT 16-3
GESTRA AG
Münchener Str. 77
28215 Bremen
Made in Germany
Leitfähigkeitstransmitter
Conductivity Transmitter
Transmetteur de mesure
de conductibilité
158°F (70°C)T
PmaxPmax
TmaxTmax
1-11,5NPT 1.4404/F316L IP65
464psi (32bar)
460°F (238°C)
7W
0,5-6000µS/cm0,25-3000ppm
OUT: 4-20mA / 500
V 20%24 ±
Tamb

18 LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Rating plate, identification
Fig. 4
OPERATING CONTROL
E513189
Output rating: 4-20mA
Input voltage: 24VDC
Input power: 7W
Environmental rating: NEMA Type 3R / 3RX / 5
Betriebsanleitung
beachten
See installation instructions
Voir instructions de
montage
LRGT 16-4
GESTRA AG
Münchener Str. 77
28215 Bremen
Made in Germany
Leitfähigkeitstransmitter
Conductivity Transmitter
Transmetteur de mesure
de conductibilité
158°F (70°C)T
PmaxPmax
TmaxTmax
1-11,5NPT 1.4404/F316L IP65
464psi (32bar)
460°F (238°C)
7W
50-10000µS/cm25-5000ppm
OUT: 4-20mA / 500
V 20%24 ±
Tamb
Betriebsanleitung
beachten
See installation instructions
Voir instructions de
montage
GESTRA AG
Münchener Str. 77
28215 Bremen
Made in Germany
Leitfähigkeitstransmitter
Conductivity Transmitter
Transmetteur de mesure
de conductibilité
158°F (70°C)T
PmaxPmax
TmaxTmax
1-11,5NPT 1.4404/F316L IP65
870psi (60bar)
527°F (275°C)
7W
0,5-6000µS/cm0,25-3000ppm
OUT: 4-20mA / 500
V 20%24 ±
Tamb
LRGT 17-3

19LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
Default factory settings
LRGT 1x-x conductivity transmitters are delivered ex works with the following settings:
Parameter Menu display Unit
Parameter values
LRGT 16-3
LRGT 17-3 LRGT 16-4
Cell constant CF 0.210
Temperature coefficient tC % / °C 002.1
Filter constant (damping) FiLt Seconds 0025
Scale of current output Sout µS 0500 7000
Display unit Unit µS
Fig. 5

20 LRGT 1x-x - USA - Installation & Operating Manual - 850689-00
µS
µS
Overall view
Fig. 6
A
B
C
G
LRGT 16-3 LRGT 16-4
F
D
E
H
LRGT 17-3