GESTRA LRR 1-52 Installation instructions

Installation & Operating Manual
EN
English
Conductivity Controller LRR
Visual Display and Operating Unit URB
LRR 1-52
LRR 1-53
URB 55
850645-01

2LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Contents
Content of this Manual................................................................................................................................... 5
Scope of delivery/Product package............................................................................................................... 5
How to use this Manual.................................................................................................................................. 6
Illustrations and symbols used...................................................................................................................... 6
Hazard symbols in this Manual...................................................................................................................... 6
Types of warning ............................................................................................................................................ 7
Specialist terms/Abbreviations...................................................................................................................... 8
Usage for the intended purpose................................................................................................................... 10
IT security and rules for the use of Ethernet devices ................................................................................11
Applicable directives and standards - LRR 1-52, LRR 1-53 ......................................................................11
Applicable directives and standards - URB 55..........................................................................................12
Improper use ................................................................................................................................................ 12
Basic safety notes ........................................................................................................................................ 13
Required personnel qualifications............................................................................................................... 13
Notes on product liability............................................................................................................................. 13
Function ........................................................................................................................................................ 14
Possible combinations of functions and equipment.................................................................................. 14
Technical data - LRR 1-52, LRR 1-53........................................................................................................... 16
Technical data - URB 55............................................................................................................................... 18
Factory settings - LRR 1-52, LRR 1-53 ........................................................................................................ 20
LRR 1-52.................................................................................................................................................20
LRR 1-53.................................................................................................................................................20
LRR 1-52, LRR 1-53 ................................................................................................................................20
Factory settings - URB 55 ............................................................................................................................ 21
Name plate / Marking - LRR 1-52, LRR 1-53 ............................................................................................... 22
Name plate / Marking - URB 55 ................................................................................................................... 23
Functional elements and dimensions - LRR 1-52, LRR 1-53 ...................................................................... 24
Installing the LRR 1-52, LRR 1-53 conductivity controller.......................................................................... 25
Dimensions - URB 55.................................................................................................................................... 26
Required installation aperture in the control cabinet door or switch panel ................................................26
Installing the URB 55.................................................................................................................................... 27
Connecting the URB 55................................................................................................................................. 28
Ports and sockets on the back of the unit.................................................................................................28
Connection for 24 V DC supply voltage - pin assignment..........................................................................28
Pin assignment of the data line between the URB 55 and the LRR 1-52, LRR 1-53...................................28

3LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Contents
Safety notes for electrical connection......................................................................................................... 29
Wiring diagram - LRR 1-52 conductivity controller .................................................................................... 30
Connecting LRG 1x-xx conductivity electrodes......................................................................................... 30
Connecting LRG 16-9 conductivity electrode ...........................................................................................31
Wiring diagram - LRR 1-53 conductivity controller .................................................................................... 32
Connecting an LRGT 1x-x conductivity transmitter (4 - 20 mA) with earthing point ..................................32
Electrical connection - LRR 1-52, LRR 1-53 ................................................................................................ 33
Connecting the 24 V DC power supply ..................................................................................................... 33
Connecting the MIN/MAX/CLOSED/OPEN output contacts.........................................................................33
Notes on connecting inductive loads........................................................................................................ 33
Connecting an LRG 16-9 conductivity electrode....................................................................................... 33
Connecting an LRGT 1x-x conductivity transmitter................................................................................... 34
Connecting the actual value/manipulated variable output (4 - 20 mA) ......................................................34
Connecting the standby input (24 V DC) ................................................................................................... 34
Connecting the potentiometer (0 - 1000 W).............................................................................................34
Connecting the data line between the conductivity controller and the URB 55 ........................................ 35
Connecting the SPECTORmodul bus system............................................................................................. 35
Changing the equipment settings................................................................................................................ 36
Status display on the LRR 1-52, LRR 1-53................................................................................................... 38
Visual display and operating unit URB 55 ................................................................................................... 39
Switching on the supply voltage............................................................................................................... 39
Operation and navigation............................................................................................................................. 40
User interface (example).......................................................................................................................... 40
Colour coding of input and status fields ...................................................................................................40
Automatic functions.................................................................................................................................41
Entering parameters using the virtual keypad ..........................................................................................41
Parameter input with password protection............................................................................................... 42
Scroll bar for long lists and menus...........................................................................................................42
Icons and functions - LRR 1-52, LRR 1-53 .................................................................................................. 43
The home screen of the LRR 1-52, LRR 1-53 conductivity controller ........................................................ 46
Alarms and error messages......................................................................................................................... 47
Opening the Alarm History - full list of all alarms......................................................................................48
System settings............................................................................................................................................ 49
System information ...................................................................................................................................... 49
Setting the date/time.................................................................................................................................... 50
Password ...................................................................................................................................................... 50
Network settings .......................................................................................................................................... 51

4LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Contents
Data exchange via Modbus TCP ................................................................................................................. 51
VNC server / Remote software..................................................................................................................... 52
Configuring the conductivity controller....................................................................................................... 53
Setting the MIN/MAX switchpoints and set point ...................................................................................... 53
Trend log .................................................................................................................................................55
Test - Testing the relays of the connected conductivity controller ............................................................. 56
Continuous blowdown valve - Setting the flushing interval and flushing time ...........................................57
Continuous blowdown valve - Calibrating the feedback potentiometer for the valve position display ........58
Calibrating the conductivity electrode ......................................................................................................59
Setting correction factor C ....................................................................................................................... 60
Setting the measuring range - LRR 1-52..................................................................................................61
Setting the measuring range - LRR 1-53..................................................................................................61
Setting the control parameters.................................................................................................................62
Guide to setting control parameters ......................................................................................................... 62
Setting automatic intermittent blowdown.................................................................................................63
System malfunctions - URB 55 .................................................................................................................... 64
Display of system malfunctions in the alarm and error list using fault codes ............................................64
Common faults and issues during use of the URB 55 ............................................................................... 65
System malfunctions - LRR 1-52, LRR 1-53 ................................................................................................ 66
Causes ....................................................................................................................................................66
Before starting systematic troubleshooting, check the installation and configuration................................66
What to do in the event of system malfunctions......................................................................................... 67
Checking installation and function ...........................................................................................................67
Taking the LRR 1-52, LRR 1-53 out of service............................................................................................. 67
Taking the URB 55 out of service................................................................................................................. 67
Disposal ........................................................................................................................................................ 68
Returning decontaminated equipment........................................................................................................ 68
EU Declaration of Conformity - LRR 1-52, LRR 1-53 ................................................................................... 69
EU Declaration of Conformity - URB 55........................................................................................................ 69

5LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Content of this Manual
Product:
■ Conductivity LRR 1-52
■ Conductivity LRR 1-53
■ Visual display and operating unit URB 55
First edition:
BAN 850645-00/03-2021cm
Applicable documents:
You can find the latest Installation & Operating Manuals on our website:
http://www.gestra.com/documents/brochures.html
© 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
LRR 1-5x
■ 1 x Conductivity LRR 1-52 or LRR 1-53
URB 55
■ 1 x visual display and operating unit URB 55
■ 4 x retaining clips
■ 1 x power supply connector
■ 1 x data cable URB 55 (L = 5 m)
LRR 1-5x + URB 55
■ 1 x Installation & Operating Manual

6LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
How to use this Manual
This Installation & Operating Manual describes the correct use of the LRR 1-52, LRR 1-53 conductivity
controller in combination with the URB 55 visual display and operating unit. It applies to persons who
integrate this equipment in control systems and 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
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

7LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Types of warning
DANGERDANGER
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.
CAUTIONCAUTION
Warning of a situation that may result in minor or moderate injury.
ATTENTIONATTENTION
Warning of a situation that results in damage to property or the environment.

8LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Specialist terms/Abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
Blowdown controller
A blowdown controller is a conductivity controller with special features for actuating continuous blow-
down valves on steam boilers. It can also be used as a conductivity controller in other types of system.
Continuous blowdown
Continuous and/or periodic removal of a certain (defined) quantity of boiler water via a continuous blow-
down valve, e.g. BAE46 or BAE47.
To determine the total dissolved solids in the boiler water, its electrical conductivity is measured in μS/cm,
although some countries also use ppm (parts per million) as the unit of measurement.
Conversion: 1 μS/cm = 0.5 ppm.
Intermittent boiler blowdown
Intermittent blowdown is achieved by the abrupt opening of the intermittent blowdown valve for a period
of around 3 seconds.
Time-based pulse/interval actuation of the intermittent blowdown valve optimises the removal of sludge
from the boiler. The interval between the intermittent blowdown pulses can be set between 1 and 200 h
(intermittent blowdown interval). The duration of intermittent blowdown can be set between 1 and 10 s. For
large boilers, repeated intermittent blowdown pulses may be required. Repetition can be set between 1 and
10 with an interval from 1 – 10 seconds (pulse interval).
External intermittent blowdown
If more than one steam boiler is connected to a single blowdown receiver, simultaneous blowdown is
not permitted. In this case,an external interlock control can monitor and control the individual blowdown
operations.
Temperature compensation
The electrical conductivity of water changes as the temperature falls or rises. To obtain meaningful read-
ings, it is therefore necessary to base the measurements on the reference temperature of 25 °C, and to
correct the measured conductivity using the temperature coefficient tC.
Cell constant
The cell constant is a geometric variable of the conductivity electrode and is taken into account when
calculating the conductivity. However, this constant may change during operation, e.g. due to dirt deposits
on the measuring electrode.
If a reference measurement yields a result that differs from the indicated conductivity value, first check
the temperature compensation.
Modify the cell constant only if the temperature coefficient setting is no longer adequate for correct com-
pensation. In this case, change the cell constant until the reading and the indicated conductivity match.

9LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Specialist terms/Abbreviations
Flushing the continuous blowdown valve
The continuous blowdown valve can be flushed automatically to prevent it from sticking. In this case, the
continuous blowdown valve is actuated at intervals (flushing interval) and opened for a certain time (flushing
time). After the flushing time, the valve moves to the position set by the control.
Operating position of the continuous blowdown valve
The operating position of the continuous blowdown valve ensures that the electrode comes into contact with
a representative amount of boiler water.
Standby mode (conductivity control)
To prevent loss of water, continuous blowdown control and automated intermittent blowdown (if enabled)
can be disabled in standby mode or when the burner is switched off.The continuous blowdown valve moves
to CLOSED position, triggered by an external control command. The MIN/MAX limits and monitoring function
remain active in standby mode.
When the equipment is back in normal mode, the continuous blowdown valve returns to the control position.
In addition, an intermittent blowdown pulse is triggered (if automated intermittent blowdown is enabled and
a blowdown interval and blowdown time have been set).
Pb (proportional band)
The proportional band enables the controller amplification to be adapted to suit the controlled system. For
further information, see page 62, guide to setting control parameters.
Ti (reset time)
The integral element ensures that control deviations can be fully corrected, with no remaining deviation.
For further information, see page 62, guide to setting control parameters.
Neutral zone
If the actual value reaches the (set point +/- of the neutral zone), the manipulated variable does
not change in this range, see page 62.
PI controller
Controller with proportional (P) and integral (I) control.
LRR .. / LRG .. / LRGT .. / URB ..
GESTRA equipment and type designations, see page 10.
SELV
Safety Extra Low Voltage

10 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Usage for the intended purpose
LRR 1-52 and LRR 1-53 conductivity controllers can be used in combination with LRG 1x-x conductivity
electrodes and LRGT 1x-x conductivity transmitters as conductivity controllers and limiters in pressurised
steam and hot-water plants and in condensate and feedwater tanks. The conductivity controller indicates
when MAX or MIN conductivity has been reached, opens or closes a continuous blowdown valve and can
actuate an intermittent blowdown valve.
Configuration, operation and visual display
The equipment is configured and operated and information is viewed via the URB 50 or URB 55 visual
display and operating unit. The URB 55 is designed for installation in a control cabinet door or switch
panel. It may only be used when correctly installed. If you are using a URB 50, please pay attention to the
information in Installation & Operating Manual “LRR1-52-LRR1-53-URB50”.
Overview of possible unit combinations
Conductivity controller Conductivity electrode/transmitter Visual display and operating unit
LRR 1-52
LRG 12-2
LRG 16-4
LRG 16-9
LRG 17-1
LRG 19-1
URB 55
LRR 1-53 LRGT 16-1 / 16-2 / 16-3 / 16-4
LRGT 17-1 / 17-2
Fig. 1
Key to Fig. 1:
LRR = conductivity controller
LRG = conductivity electrode
LRGT = conductivity transmitter
URB = visual display and operating unit
To ensure the proper use of equipment for 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 the system components named
in Fig. 1 on our website:
http://www.gestra.com/documents/brochures.html

11LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Usage for the intended purpose
IT security and rules for the use of Ethernet devices
The plant operator is responsible for the security of his/her IT network and must take appropriate action to
protect equipment, systems and components from unauthorised access.
Pay attention to the following instructions when using Ethernet devices in your system:
■ Do not connect equipment, systems or components to an open network, such as the internet, without
safeguards in place.
■ To fully protect a PLC runtime system on a control system that is available on the internet, the use of
common security mechanisms (firewall, VPN access) is absolutely essential.
■ Make sure access to all components is restricted to authorised persons.
■ Change default factory passwords before bringing into service for the first time!
■ Deploy defence in depth mechanisms in your system security, to restrict access and control to individ-
ual products and networks.
Applicable directives and standards - LRR 1-52, LRR 1-53
The LRR 1-52, LRR 1-53 conductivity controller has been tested and approved for use in the scope gov-
erned by the following directives and standards:
Directives:
■ Directive 2014/68/EU Pressure Equipment Directive
■ Directive 2014/35/EU Low Voltage Directive
■ Directive 2014/30/EU EMC Directive
■ Directive 2011/65/EU RoHS Directive
Standards:
■ DIN EN 60730-1:2011 Automatic electrical controls - Part 1:
General requirements
■ EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use -
EMC requirements
■ EN 61010-1:2010 Safety requirements for electrical equipment for measurement,
control and laboratory use - Part 1: General requirements
■ EN 55011:2009 + A1:2010 Industrial, scientific and medical electrical equipment -
Radiofrequency disturbance characteristics -
Limits and methods of measurement
Standards documents:
■ VdTÜV Bulletin BP WAUE 0100-RL
Requirements for the testing of water monitoring equipment
■ UL 508

12 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Usage for the intended purpose
Applicable directives and standards - URB 55
The URB 55 has been tested and approved for use in the scope in the scope governed by the following
directives and standards:
■ Directive 2014/30/EU EMC Directive
■ Directive 2011/65/EU RoHS Directive
Standards:
■ EN 61000-6-2:2005+AC:2005 Electromagnetic compatibility (EMC) - Part 6-2: Generic
standards - Immunity for industrial environments
■ EN 61000-4-29:2000 Electromagnetic compatibility (EMC) - Part 4-29:
Testing and measurement techniques - Voltage dips, short
interruptions and voltage variations on d.c. input power port
immunity tests
■ EN 61000-6-4:2007+A1:2011 Electromagnetic compatibility (EMC) - Part 6-4:
Generic standards - Emission standard for industrial environments
■ EN 60945:2002 Maritime navigation and radiocommunication equipment and
systems - General requirements - Methods of testing and
required test results
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.

13LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Basic safety notes
There is a risk of electric shock during work on electrical systems.
■ Always switch off the voltage to the equipment before performing work on the terminal
strips.
■ Check that the system is not carrying live voltage before commencing work.
Faulty equipment is a danger to system safety.
■ If the LRR 1-52, LRR 1-53 conductivity controller does not behave as expected, it may be
faulty.
■ Perform failure analysis.
■ Only replace faulty equipment with identical equipment from GESTRA AG.
Required personnel qualifications
Activity Personnel
Integration in control system Specialist staff Plant designer
Installation/electrical connection/
bringing into service Specialist staff Electrician/installer
Operation Boiler service technician Staff trained by the plant operator
Maintenance work Specialist staff Electrician
Setup work Specialist staff Plant construction
Fig. 2
Notes on product liability
The manufacturer cannot accept any liability for damages resulting from improper use of the equipment.

14 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Function
The LRR 1-52, LRR 1-53 conductivity controller is a 3-position stepping controller. It evaluates the signals
from a conductivity electrode (e.g. LRG 16-60, LRG 16-61 or LRG 17-60) or conductivity transmitter.
The conductivity controller indicates when MAX or MIN conductivity has been reached, opens or closes a
continuous blowdown valve and can actuate an intermittent blowdown valve.
Function tests and failure diagnosis can be performed using the URB 55 visual display and operating unit.
Behaviour when MIN/MAX conductivity is reached
If the minimum or maximum conductivity is reached, the appropriate output contact is opened.
What happens if the MAX limit is exceeded
■ If used as a conductivity limiter, the LRR 1-52, LRR 1-53 conductivity controller does not interlock
automatically when the MAX limit is exceeded.
Possible combinations of functions and equipment
Combining the LRR 1-52, LRR 1-53 conductivity controller with the conductivity electrodes, conductivity
transmitters and URB 55 visual display and operating unit provides the following common functions:
Conductivity controller LRR 1-52 LRR 1-53
Conductivity measurement with an LRG 1.-.. conductivity electrode and separate Pt
100 resistance thermometer (TRG 5-..)
or
Conductivity measurement with an LRG 16-9 conductivity electrode with integrated
resistance thermometer.
l
Evaluating the temperature-compensated current signal of a connected
LRGT 1x-x conductivity transmitter. l
3-position stepping controller with proportional plus integral control (PI controller)
and actuation of an electrically operated continuous blowdown valve. l l
MAX alarm when the conductivity limit is exceeded. l l
MIN alarm when conductivity drops below the minimum limit.
Alternatively, MIN relay for automated intermittent blowdown. l l
The valve position can be displayed if a potentiometer is connected (in the continuous
blowdown valve). The valve position is then shown on the URB 55 visual display and
operating unit.
l l
Switchable (DIP3) actual value/manipulated variable output, e.g. for remote actual value
display or direct connection to a continuous blowdown valve (manipulated variable
output)
l l
Volt-free input 24 V DC (standby) for inputting an external command
Control OFF / Valve CLOSED / Intermittent blowdown OFF l l
Fig. 3

15LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Function
Visual display and operating unit URB 55
Display of actual value X (bar chart in µS/cm or ppm) l
Display of valve position Yw (bar chart in %) l
Setting the measuring range l
Display/setting control parameters l
Trend log l
Display and list of faults, alarms and warnings l
Testing MIN/MAX output relays or actuating the intermittent blowdown valve l
Manual/automatic mode l
Password protection l
Level and conductivity controllers can be operated simultaneously l
Fig. 4

16 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Technical data - LRR 1-52, LRR 1-53
Supply voltage
■ 24 V DC +/-20 %
Power consumption
■ Max. 5 VA
Current input
■ Max. 0.3 A
Reset hysteresis
■ MAX limit: - 3 % of set MAX limit (factory default)
■ MIN limit: - 3 % of set MIN limit (factory default)
Required external fuse
■ 0.5 A M
Input/output
■ Interface for data exchange with the URB 55 visual display and operating unit
Inputs
■ 1 x analogue input for potentiometer 0 - 1000 W, two-wire connection (display of valve position)
■ 1 x volt-free input 24 V DC (standby) for inputting an external command
Control OFF / Valve CLOSED / Intermittent blowdown OFF
Outputs
■ Continuous blowdown valve (CLOSED/OPEN) *
◆ 2 x volt-free relay contacts (changeover relays) **
◆ Maximum switching current - 8 A at 250 V AC / 30 V DC - cos ϕ = 1 **
■ MIN/MAX alarm *
◆ 2 x volt-free relay contacts (changeover relays) **
◆ Maximum switching current - 8 A at 250 V AC / 30 V DC - cos ϕ = 1 **
or
■ MAX alarm and MIN relay as intermittent blowdown valve *
◆ 1 x volt-free relay contact (changeover relay) - intermittent blowdown valve **
◆ 1 x volt-free relay contact (changeover relay) - MAX alarm **
* Inductive loads must have interference suppression (RC combination) as per the manufacturer's
specification
** Contact material AgNi0.15, AgSnO2
Analogue output
■ 1 x actual value output 4 - 20 mA, e.g. for an actual value display
■ Max. load resistance 500 W
■ Inductive loads must have interference suppression (RC combination) as per the manufacturer’s
specification

17LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Technical data - LRR 1-52, LRR 1-53
Indicators and controls
■ 1 x multicolour LED (orange, green, red)
◆ orange = power up
◆ green = running
◆ red = malfunction
■ 1 x 4-pole code switch for setting the controller group and baud rate
Protection class
■ II double insulated
IP rating to EN 60529
■ Housing: IP 40
■ Terminal strips: IP 20
Electrical safety
■ Degree of contamination 2 for installation in control cabinet with protection rating IP 54
Admissible ambient conditions
■ Service temperature: - 10 °C – 55 °C (0 °C – 55 °C at power-on)
■ Storage temperature: - 20 °C – 70 °C *
■ Transport temperature: - 20 °C – 80 °C (< 100 hours) *
■ Air humidity: max. 95 %, non-condensing
* Only switch on after a 24-hour defrosting period
Housing
■ Housing material: Lower section of black polycarbonate (glass-fibre reinforced), front of grey
polycarbonate
■ 2 x 15-pole terminal strips, removable separately
■ Max. cross-section per screw terminal:
◆ 1 x 4.0 mm2solid, or
◆ 1 x 2.5 mm2stranded with sleeve, or
◆ 2 x 1.5 mm2stranded with sleeve
■ Housing attachment: Mounting clip on support rail TH 35 (to EN 60715)
Weight
■ Approx. 0.5 kg

18 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Technical data - URB 55
Supply voltage
■ 24 V DC ( ) +/- 20 %
Power consumption
■ Max. 14.4 W
Current input
■ Max. 0.6 A (at 24 V)
Required external fuse
■ 10 A
Data transmission interfaces
■ 2 x Ethernet 10/100 Mbit switched (Modbus TCP/IP)
■ 1 x USB host port (versions 2.0 and 1.1)
■ 1 x slot for SD card
Indicators and controls
■ Capacitive 5” touchscreen with LED backlight
■ Resolution 800 x 480 pixels (WVGA)
■ Brightness 200 Cd/m2, dimmable
■ Size (field of view) 110 mm x 65 mm
IP rating
■ Front: IP 66
■ Back: IP 20
Admissible ambient conditions
■ Service temperature: 0 °C – 60 °C
■ Storage temperature: - 20 °C – 70 °C
■ Transport temperature: - 20 °C – 70 °C
■ Air humidity: 5 % – 85 % relative humidity, non-condensing
Housing
■ Material: Front (metal/glass) / rear (metal electronics housing)
■ Housing attachment with the supplied fastening elements
■ Intended for installation in a control cabinet or switch panel
Dimensions, see page 26
■ Front panel (W x H) 147 x 107 mm
■ Switch panel cutout (W x H) 136 mm x 96 mm
■ Depth 52 mm + 8 mm protruding

19LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Technical data - URB 55
Weight
■ Approx. 1 kg
Internal battery, permanently installed, non-replaceable
■ Type: Lithium-ion, battery is charged automatically
If the equipment is out of service for six months or more, we recommend connecting it to the
supply voltage for one day, to recharge the battery.

20 LRR 1-52, LRR 1-53, URB 55 - Installation & Operating Manual - 850645-01
Factory settings - LRR 1-52, LRR 1-53
The conductivity controller is delivered with the following factory settings:
■ Code switch setting (sliding switch, white):
LRR 1-52
■ Configuration, see page 37 /, Fig. 19
13
ON 24
S 1 = OFF
S 2 = ON
S 3 = OFF
S 4 = OFF
■ Measuring range: 0.5 to 10000
µS/cm
■ Correction factor C LRG 1 cm-1
■ Temperature compensation: Switched off
■ Temperature coefficient: 2.1 % / °C
LRR 1-53
■ Configuration, see page 37 /, Fig. 19
S 1 = OFF
S 2 = ON
S 3 = OFF*)
S 4 = OFF
■ Measuring range: 0.5 to 6000 µS/cm
*) from controller software 311178.13
LRR 1-52, LRR 1-53
■ MAX switchpoint: 6000 µS/cm
■ MIN switchpoint: 500 µS/cm
■ Reset hysteresis: MAX limit 3 % of set limit (factory default)
■ Set point: 3000 µS/cm
■ Proportional band (Pb): ± 20 % of set point
■ Reset time (Ti): 0 seconds
■ Neutral zone: ± 5 % of set point
■ Valve runtime: 360 seconds
■ Controlled operation: Automatic
■ MIN relay function: MIN alarm
■ 24h flushing: On
■ Flushing interval: 0 hours
■ Flushing time: 180 seconds. The set time takes effect twice. The valve moves
to OPEN for 180 seconds and to CLOSED for 180 seconds.
With actuation of an intermittent blowdown valve (MIN relay function = automatic intermittent
blowdown)
■ Intermittent blowdown interval: 24 hours
■ Intermittent blowdown time: 3 seconds
■ Number of
intermittent blowdown pulses: 1
■ Pulse interval: 2 seconds
13
ON 24