GESTRA LRR 1-52 User manual

Original Installation &
Operating Manual
Conductivity Controller LRR
Visual Display and Operating Unit URB
LRR 1-52
LRR 1-53
URB 55
850703-00
EN (USA)
English

2LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Contents
Content of this Manual.........................................................................................................................5
Scope of supply, 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 standards for the LRR 1-52, LRR 1-53 ..........................................................................11
Applicable standards for the URB 55..............................................................................................12
Improper use ......................................................................................................................................12
Basic safety information ....................................................................................................................13
Required personnel qualifications.....................................................................................................13
Notes on product liability...................................................................................................................13
Function ..............................................................................................................................................14
Possible combinations of functions and equipment ........................................................................14
Technical data for the LRR 1-52, LRR 1-53........................................................................................16
Technical data for the URB 55............................................................................................................18
Factory settings of the LRR 1-52, LRR 1-53 ......................................................................................20
LRR 1-52.......................................................................................................................................20
LRR 1-53.......................................................................................................................................20
LRR 1-52, LRR 1-53 ......................................................................................................................20
Factory default settings of the URB 55..............................................................................................21
Rating plate, identification of the LRR 1-52, LRR 1-53 .....................................................................22
Rating plate, identification of the URB 55 .........................................................................................23
Functional elements and dimensions of the LRR 1-52, LRR 1-53 ....................................................24
Installing the LRR 1-52, LRR 1-53 conductivity controller................................................................25
Dimensions of the 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 data line between URB 55 and LRR 1-52, LRR 1-53 ..........................................28

3LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Contents
Safety information on the electrical connection...............................................................................29
Wiring diagram for the LRR 1-52 conductivity controller.................................................................30
Connecting LRG 16-4 conductivity electrodes ................................................................................30
Connecting an LRG 16-9 conductivity electrode ............................................................................31
Wiring diagram for the LRR 1-53 conductivity controller.................................................................32
Connecting an LRGT 1x-x conductivity transmitter (4 - 20mA) .....................................................32
Electrical connection of the 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 of 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
Color coding of input and status fields ...........................................................................................40
Automatic functions.......................................................................................................................41
Entering parameters using the virtual keypad ................................................................................41
Entering parameters with password protection ..............................................................................42
Scroll bar for long lists and menus.................................................................................................42
Icons and functions of the LRR 1-52, LRR 1-53 ................................................................................43
Home screen of LRR 1-52, LRR 1-53 conductivity controllers..........................................................46
Alarm and fault indications................................................................................................................47
Opening the alarm history..............................................................................................................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 - USA - Installation & Operating Manual - 850703-00
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
Setting the flushing interval and flushing time of the continuous blowdown valve ..........................57
Calibrating the feedback potentiometer for a display of the continuous blowdown valve position ...58
Calibrating the conductivity electrode ............................................................................................59
Setting correction factor C .............................................................................................................60
Setting the measuring range of the LRR 1-52 ................................................................................61
Setting the measuring range of the LRR 1-53 ................................................................................61
Setting the control parameters.......................................................................................................62
Guide to setting control parameters ...............................................................................................62
Setting automatic intermittent blowdown.......................................................................................63
System malfunctions of the URB 55 ..................................................................................................64
Indication of system malfunctions in the alarm and error list using error codes..............................64
Common faults and issues during use of the URB 55 .....................................................................65
System malfunctions of the LRR 1-52, LRR 1-53 ..............................................................................66
Causes ..........................................................................................................................................66
Check the installation and configuration before systematic troubleshooting ...................................66
What to do in the event of system malfunctions...............................................................................67
Check installation and function ......................................................................................................67
Taking the LRR 1-52, LRR 1-53 out of service...................................................................................67
Taking out of service URB 55 .............................................................................................................67
Disposal ..............................................................................................................................................68
Returning decontaminated equipment..............................................................................................68
UL components...................................................................................................................................68

5LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Content of this Manual
Product:
■ Conductivity controller LRR 1-52
■ Conductivity controller LRR 1-53
■ Visual display and operating unit URB 55
First edition:
IOM 850703-00/09-2021cm
Applicable documents:
You can find the latest Installation & Operating Manuals on our website:
http://www.gestra.com
© 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
LRR 1-5x
■ 1 x Conductivity controller 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
LRR 1-5x + URB 55
■ 1 x Installation & Operating Manual

6LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
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, 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 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
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 - USA - Installation & Operating Manual - 850703-00
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 - USA - Installation & Operating Manual - 850703-00
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
blowdown 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
blowdown 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 optimizes 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 actual duration of intermittent blowdown can be
set between 1 and 10seconds. 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 conductivity of water changes as the temperature falls or rises. To obtain meaningful readings,
it is therefore necessary to base the measurements on the reference temperature of 77°F (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 the conductivity is calculated. However, this constant may change during operation, e.g., due
to dirt deposits on the measuring electrode.
If the result of a reference measurement differs from the indicated conductivity reading, first check
the temperature compensation.
Modify the cell constant only if the temperature coefficient setting is no longer adequate for correct
compensation. Change it until the reading and the indicated conductivity match.

9LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
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 sample of boiler water.
Standby mode (conductivity control)
To prevent loss of water, continuous blowdown control and automatic intermittent blowdown (if
enabled) can be disabled in standby mode or when the burner is switched off. An external control
command causes the continuous blowdown valve to move to the CLOSED position. The MIN/MAX
limits and monitoring functions remain active in standby mode.
When the equipment is back in normal mode, the continuous blowdown valve returns to the control
position. An intermittent blowdown pulse is also triggered (if automatic 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 9, 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 9, guide to setting control parameters.
Dead band
If the actual value reaches the (set point +/- of the dead band), the manipulated variable does
not change in this band, see page 9.
PI controller
Controller with proportional (P) and integral (I) control.
LRR .. / LRG .. / LRGT .. / URB ..
GESTRA equipment and type designations, see page 9.
SELV
Safety Extra Low Voltage

10 LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
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 steam boilers and hot water installations 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. LRR 1-52 and
LRR 1-53 are classified as operating controls in accordance with UL 60730-1.
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 equipment combinations
Conductivity controller Conductivity electrode/transmitter Visual display and operating unit
LRR 1-52 LRG 16-4
LRG 16-9
URB 55
LRR 1-53 LRGT 16-3 / 16-4
LRGT 17-3
Fig. 1
Key to Fig. 1:
LRR = conductivity controller
LRG = conductivity electrode
LRGT = conductivity transmitter
URB = visual display and operating unit
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 the system components
named in Fig. 1 on our website:
http://www.gestra.com

11LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
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 unauthorized access.
Pay attention to the following instructions when using Ethernet devices in your plant:
■ 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.
■ Restrict access to all components to authorized persons only.
■ Change default passwords before bringing into service for the first time!
■ Deploy defense in depth mechanisms in your plant security, to restrict access
and control to individual products and networks.
Applicable standards for the 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
governed by the following directives and standards:
Standards:
■ UL 60730-1 and CAN/CSA E60730-1
General Requirements for Automatic Electrical Controls

12 LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Usage for the intended purpose
Applicable standards for the 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:
Standards:
■ UL 61010-1 and CAN/CSA C22.2 No. 61010-1
Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use -
Part 1: General Requirements
■ UL 61010-2-201 and CAN/CSA C22.2 No. 61010-2-201
Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use -
Part 2-201: Particular Requirements for Control Equipment
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.

13LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Basic safety information
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 plant is not carrying live voltage before commencing work.
Faulty equipment is a danger to plant 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 - USA - Installation & Operating Manual - 850703-00
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 16-4, LRG 16-9) or conductivity transmitter
(LRGT 16-3, LRGT 16-4, LRGT 17-3).
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 operat-
ing unit.
What happens if 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 inter-
lock 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, con-
ductivity transmitters and URB 55 visual display and operating unit enables the following common
functions to be performed:
Conductivity controller LRR 1-52 LRR 1-53
Conductivity measurement with an LRG 1.-.. conductivity electrode and sepa-
rate Pt100 resistance thermometer
or
Conductivity measurement with an LRG 16-9 conductivity electrode with inte-
grated resistance thermometer.
l
Evaluation of the temperature-compensated current signal of a connected
LRGT1x-x conductivity transmitter. l
3-position stepping controller with proportional-plus-integral control action
(PI controller) and actuation of an electrically operated continuous blowdown
valve.
l l
MAX alarm when conductivity rises above the maximum limit. l l
MIN alarm when conductivity drops below the minimum limit.
Alternatively, MIN relay for automatic intermittent blowdown. l l
If a potentiometer is connected (in the continuous blowdown valve), the valve
position can be displayed. The valve position is then shown on the URB 55
visual display and operating unit
l l
Switch-selectable (DIP3) actual value/manipulated variable output, e.g., for
separate indication of the actual value 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 - USA - Installation & Operating Manual - 850703-00
Function
Visual display and operating unit URB 55
Indication of actual value X (bar chart in µS/cm or ppm) l
Indication of valve position Yw (bar chart in %) l
Setting the measuring range l
Indication/setting of control parameters l
Trend log l
Indication and listing of errors, alarms and warnings l
Test of MIN/MAX output relays or actuation of 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 - USA - Installation & Operating Manual - 850703-00
Technical data for the LRR 1-52, LRR 1-53
Supply voltage
■ 24 V DC +/-20%; PELV / CLASS2
Power consumption
■ Max. 5 W
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)
Fuse
■ M0.5A (medium time-lag)
Input/output
■ Interface for data exchange with the URB 55 visual display and operating unit
Inputs
■ 1 x
analog input for potentiometer 0 - 1000W, two-wire connection (indication 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 specified by the
manufacturer.
** Contact material AgNi0.15, AgSnO2
Analog output
■ 1 x actual value output 4 - 20mA, e.g., for indicating the actual value
■ Max. load resistance 500W
■ Inductive loads must have interference suppression (RC combination) as specified by the
manufacturer

17LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Technical data for the LRR 1-52, LRR 1-53
Indicators and controls
■ 1 x multicolor LED (amber, green, red)
◆ amber = power up
◆ green = running
◆ red = malfunction
■ 1 x 4-pole code switch for configuring the conductivity controller.
Protection
■ Terminal box: IP40 according to EN 60529
■ Terminal strips: IP20 according to EN 60529
■ As a UL open type, the equipment must be installed in a control cabinet.
Electrical safety
■ Pollution degree 2, overvoltage category II according to UL 60730-1
Admissible ambient conditions
■ Service temperature: 14° - 122°F (-10° - 50°C)
[at power-on 32° - 122°F (0° - 50°C)]
■ Storage temperature: -4° - 158°F (-20° - 70°C) *
■ Transport temperature: -4° - 176°F (-20° - 80°C) (< 100hours) *
■ Air humidity: Max. 95%, non-condensing
* Only switch on after a defrosting period of 24 hours
Terminal box
■ Terminal box material: Lower section of black polycarbonate (glass-fiber reinforced), front of
gray polycarbonate
■ 2 x 15-pole terminal strips, removable separately
■ Max. wire size per screw terminal:
◆ 1 x AWG12 (4.0mm2) solid, or
◆ 1 x AWG14 (2.5mm2) stranded with sleeve, or
◆ 2 x AWG16 (1.5mm2) stranded with sleeve
■ Terminal box attachment: Mounting clip on support rail TH 35 (according to EN 60715)
Weight
■ Approx. 1.1 lb (0.5 kg)
Other information
■ Incorporated type 1 action operating control
■ Pollution degree 2, impulse voltage DC supply = 500V, AC output = 2500V

18 LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Technical data for the URB 55
Supply voltage
■ 24 V DC ( ) +/- 20%; PELV / CLASS2
Power consumption
■ Max. 14.4 W
Current input
■ Max. 0.6 A (at 24 V)
Fuse
■ Internal, automatic
Interfaces for data transmission
■ 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
Protection
■ Front: IP66 according to EN 60529
■ Back: IP20 according to EN 60529
Admissible ambient conditions
■ Service temperature: 32° - 140°F (0° - 60°C)
■ Storage temperature: -4° - 158°F (-20° - 70°C)
■ Transport temperature: -4° - 158°F (-20° - 70°C)
■ Air humidity: 5% – 85% relative humidity, non-condensing
Enclosure
■ Material: Front (metal/glass) / back (metal enclosure for electronics)
■ Enclosure attachment with the supplied fastening elements
■ Intended for installation in a control cabinet or switch panel
For dimensions, see page 18
■ Front panel (W x H) 5.79in (147mm) x 4.21in (107mm)
■ Switch panel cutout (W x H) 5.35in (136mm) x 3.78in (96mm)
■ Mounting depth 2.05in (52mm) + 0.32in (8mm) protruding

19LRR 1-52, LRR 1-53, URB 55 - USA - Installation & Operating Manual - 850703-00
Technical data for the URB 55
Weight
■ Approx. 2.21 lb (1 kg)
Internal battery, permanently installed, non-replaceable
■ Type: Lithium-ion, 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 - USA - Installation & Operating Manual - 850703-00
Factory settings of the LRR 1-52, LRR 1-53
The conductivity controller is delivered with the following factory default settings:
■ Code switch setting: (sliding switch, white)
LRR 1-52
■ For configuration, see page 20 /, Fig. 19
13
ON 24
S 1 = OFF
S 2 = ON
S 3 = OFF
S 4 = OFF
■ Measuring range:
0.25 to 5000ppm (0.5 to 10000µS/cm)
■ Correction factor C LRG: 1 cm-1
■ Temperature compensation: off
■ Temperature coefficient: 2.1% / °C
LRR 1-53
■ For configuration, see page 20 /, Fig. 19
S 1 = OFF
S 2 = ON
S 3 = OFF*)
S 4 = OFF
■ Measuring range: 0.25 to 3000ppm
(0.5 to 6000µS/cm)
*) Controller software version 311178.13 or
later
LRR 1-52, LRR 1-53
■ MAX switchpoint: 3000ppm (6000µS/cm)
■ MIN switchpoint: 250ppm (500µS/cm)
■ Reset hysteresis: MAX limit - 3% of set limit
(factory default)
■ Set point: 1500ppm (3000µS/cm)
■ Proportional band (Pb): ± 20% of set point
■ Reset time (Ti): 0 seconds
■ Dead band: ± 5% of set point
■ Valve runtime: 360 seconds
■ Control mode: 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 intermit-
tent blowdown)
■ Intermittent blowdown interval: 24 hours
■ Intermittent blowdown time: 3 seconds
■ Number of
intermittent blowdown pulses: 1
■ Pulse interval: 2 seconds
13
ON 24