GESTRA LRR 1-50 Manual

LRR 1-50
LRR 1-51
Installation & Operating Instructions
819224-03
Conductivity Controller LRR 1-50
Conductivity Controller LRR 1-51
GESTRA Steam Systems
EN
English

2
Contents
Page
Important notes
Usage for the intended purpose...............................................................................................................4
Glossary..................................................................................................................................................4
Function..................................................................................................................................................5
Safety note..............................................................................................................................................6
Directives and standards
EU Pressure Equipment Directive 2014/68/EU.........................................................................................7
VdTÜV Bulletin “Water Monitoring 100”...................................................................................................7
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)........................................................7
ATEX (Atmosphère Explosible) .................................................................................................................7
Note on the Declaration of Conformity / Declaration by the Manufacturer .........................................7
Technical data
LRR 1-50, LRR 1-51 ...............................................................................................................................8
Only LRR 1-50 ........................................................................................................................................9
Only LRR 1-51 ........................................................................................................................................9
LRR 1-50, LRR 1-51................................................................................................................................9
Scope of supply ......................................................................................................................................9
Name plate / marking ...........................................................................................................................10
In control cabinet: Installing the conductivity controller
Dimensions LRR 1-50, LRR 1-51...........................................................................................................11
Key .......................................................................................................................................................11
Installation in control cabinet.................................................................................................................11
In control cabinet: Wiring the conductivity controller
Wiring diagram for conductivity controller LRR 1-50..............................................................................12
Key .......................................................................................................................................................12
Wiring diagram for conductivity controller LRR 1-51..............................................................................13
Key .......................................................................................................................................................13
Connection of supply voltage.................................................................................................................14
Connecting output contacts...................................................................................................................14
Connecting conductivity electrode LRG 12-2, LRG 16-4, LRG 17-1 and LRG 19-1,
resistance thermometer TRG 5-.. ..........................................................................................................14
Connection of conductivity electrode LRG 16-9 .....................................................................................14
Connection of conductivity transmitter LRGT 1.-.. .................................................................................15
Connection of actual-value output.........................................................................................................15
Tools.....................................................................................................................................................15

3
Contents
Page
– continued –
In the plant: Wiring the conductivity electrode / transmitter
Connecting conductivity electrode LRG 12-2, LRG 16-4, LRG 17-1 and LRG 19-1,
resistance thermometer TRG 5-.. ..........................................................................................................16
Connection of conductivity electrode LRG 16-9 .....................................................................................16
Connection of conductivity transmitter LRGT 1.-.. .................................................................................16
Factory settings ..................................................................................................................................17
Changing factory settings
Switch selection of unit of measurement...............................................................................................18
Tool.......................................................................................................................................................18
Operating the conductivity controller
Key to codes on seven-segment display................................................................................................19
Commissioning procedure
Setting parameters................................................................................................................................20
Conductivity controller LRR 1-50: Setting switchpoints and parameters.................................................21
Conductivity controller LRR 1-51: Setting switchpoints and parameters.................................................22
Operation, alarm and test
Conductivity controller LRR 1-50, LRR 1-51:
Indications and checking the functions of the MAX output contacts .......................................................23
Troubleshooting
Indication, diagnosis and remedy ..........................................................................................................24
Further notes
Action against high frequency interference............................................................................................25
Decommissioning / replacing the equipment.........................................................................................25
Disposal................................................................................................................................................25

4
Important notes
Usage for the intended purpose
The conductivity controller LRR 1-50, LRR 1-51 in conjunction with conductivity electrodes LRG 1.-..
and conductivity transmitter LRGT 1.-.. is used as conductivity controller and limit switch, for instance
in steam boilers, (pressurized) hot-water installations as well as condensate and feedwater tanks. The
conductivity controller indicates when the MAX conductivity limit is reached and opens or closes a
continuous blowdown valve.
The conductivity controllers are designed for use with conductivity electrodes and transmitters in the
following equipment combinations: Conductivity controller LRR 1-50 together with conductivity electro-
des LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1 and LRG 19-1; Conductivity controller LRR 1-51 together
with conductivity transmitters LRGT 16-1, LRGT 16-2 and LRGT 17-1.
Continuous boiler blowdown (top blowdown)
As the boiler water evaporates, the concentration of non-volatile dissolved solids (TDS) left behind in
the boiler increases over time as a function of steam consumption. If the TDS (= total dissolved solids)
concentration exceeds the limit defined by the boiler manufacturer, foaming and priming occurs as
the density of the boiler water increases, resulting in a carry-over of solids with vapour into steam
lines and superheaters. As a consequence, the operational safety is impaired and severe damage to
boiler and tubes may occur. To keep the TDS concentration within admissible limits, a certain por-
tion of boiler water must be removed continuously or periodically (by means of a blowdown valve)
and fresh make-up water must be added to the boiler feed to compensate for the water lost through
blowdown. Electrical conductivity - here as a result of the TDS content of boiler water - is measured in
microSiemens/cm (μS/cm). However, in some countries ppm (parts per million) is used for conductivity
readings. Conversion: 1µS/cm = 0.5 ppm.
Operating position of the continuous blowdown valve
Continuous blowdown (also known as top blowdown) is the process where boiler water is removed
from the water's surface in order to reduce the concentration of dissolved solids. As the name implies,
continuous or top blowdown is done on a continuous basis, which means that the blowdown valve
remains in a slightly open position (valve position “OPERATING”) in order to allow the required amount
of boiler water to be discharged. For close control and accurate regulation this operating position must
be adjusted in the continuous blowdown valve. The amount of boiler blowdown can be determined by
using the capacity charts for the valve.
Switching hysteresis
The controller works as 2-position controller, which means that the continuous blowdown valve is
motored into the OPEN position when the setpoint is reached. The conductivity must then decrease
until a new value that is lower than the setpoint minus the adjusted hysteresis HySt is reached. Once
this value is reached the valve will be motored into the operating position.
Temperature compensation
The electrical conductivity changes as the temperature falls or rises. To obtain meaningful readings it is
therefore necessary that the measurements are based on the reference temperature of 25 °C and that
the measured conductivity values are corrected by the temperature coefficient factor tC.
Cell constant and correction factor
The cell constant is a geometric quantity characteristic of the conductivity electrode and is taken into
account when calculating the conductivity. However, in the course of time this constant may chance,
e. g. due to dirt deposits accumulated on the measuring electrode. Deviations can be compensated by
changing the correction factor CF.
Glossary

5
Important notes
Function
The conductivity controller LRR 1-50 in conjunction with the conductivity electrode LRG 1.-.. measures
the electrical conductivity in conductive liquids. The LRG 1.-.. is used as conductivity electrode or the
LRG 16-9 with integrated resistance thermometer for detecting the fluid temperature. To measure the
temperature you can also use a separate resistance thermometer Pt 100.
The conductivity controller LRR 1-51 processes the conductivity-dependent current signal of the con-
ductivity transmitter LRGT 1.-.. This signal is then standardized in the conductivity controller according to
the adjusted measuring range and indicated by the 7-segment LED display.
Conductivity controller LRR 1-50: If conductivity electrode LRG 1.-.. is connected, a reference
measurement is taken and by setting the correction factor CF accordingly the conductivity readings are
adapted to the specific conditions of the installation.
If a resistance thermometer is used, not only the electrical conductivity but also the water temperature
will be measured. The conductivity reading is automatically compensated in the conductivity controller
as a function of the adjusted temperature coefficient tC (%/°C). Even if the temperature changes, thanks
to the adjusted linear temperature compensation, the measured value is referenced to 25 °C over the
whole measuring range and indicated on the 7-segment LED display.
The conductivity controller LRR 1-50, LRR 1-51 works as 2-position controller, which means that
the continuous blowdown controller is motored into the OPEN position when the setpoint is reached.
Once the conductivity has fallen below the adjusted hysteresis, the valve is motored into the OPERATING
position. To avoid loss of boiler water, the controller will automatically close the valve when the boiler is
shut down. Two flashing LEDs indicate whether the continuous blowdown valve is opening or closing.
The MAX limit can be variably adjusted within the measuring range.
Once the MAX limit is reached, the MAX output contact is switched over and the LED indicating MAX
limit is illuminated. The equipment will be reset once the value has fallen below the preset hysteresis.
Any faults or malfunctions in the conductivity electrode, the conductivity transmitter, the electrical con-
nection or the settings will be indicated as error code by the 7-segment LED display. In the event of a
malfunction a MAX alarm will be raised and the continuous blowdown valve is motored into the OPERA-
TING position.
If the malfunction occurs only in the conductivity controller LRR 1-50, LRR 1-51 a MAX alarm will be
raised, the continuous blowdown controller is motored into the OPERATING position and the system is
re-started.
Parameter settings can be changed or a MAX alarm can be simulated by operating the rotary button.
The electrical conductivity is measured in µS/cm. In some countries ppm (parts per million) is used
instead. Conversion: 1µS/cm = 0.5 ppm. The conductivity controller can be adjusted accordingly.
– continued –
Purging of the continuous blowdown valve
To prevent the continuous blowdown valve from getting stuck the valve can be rinsed automatically.
At regular intervals (purging pulse Si) the continuous blowdown valve is motored into the open position
and rinsed (purging time Sd). When the purging time is over, the valve is motored into the OPERATING
position or into the required control position.
Glossary – continued –

6
Safety note
The equipment must only be installed, wired and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who - through adequate
training - have achieved a recognised level of competence.
Danger
The terminal strips of the equipment are live during operation.
This presents the danger of electric shock!
Always cut off power supply to the equipment before mounting, removing or connecting
the terminal strips!
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
Important notes – continued –

7
Directives and standards
ATEX (Atmosphère Explosible)
According to the European Directive 2014/34/EU the equipment must not be used in explosion risk areas.
LV (Low Voltage) Directive and EMC (Electromagnetic Compatibility)
The equipment meets the requirements of the Low Voltage Directive 2014/35/EU and the EMC Directive
2014/30/EU.
Note on the Declaration of Conformity / Declaration by the Manufacturer
For details on the conformity of our equipment according to the European Directives see our Declaration of
Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra.com/documents or can be requested from us.
Note
The conductivity electrodes LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1 and LRG 19-1 are
simple items of electrical equipment as specified in EN 60079-11 section 5.7. According to
the European Directive 2014/34/EU the equipment must be equipped with approved Zener
barriers if used in potentially explosive areas. Applicable in Ex zones 1, 2 (1999/92/EC).
The equipment does not bear an Ex marking.
VdTÜV Bulletin “Water Monitoring 100”
The conductivity controller LRR 1-50, LRR 1-51 in conjunction with conductivity electrode LRG 1.-.. and
conductivity transmitter LRGT 1.-.. is type approved according to VdTÜV Bulletin “Wasserüberwachung
(= Water Monitoring) 100”. The VdTÜV Bulletin “Water Monitoring 100” states the requirements made
on water monitoring equipment.
EU Pressure Equipment Directive 2014/68/EU
The conductivity control & monitoring equipment LRG 1.-..,LRGT 1.-.., LRS 1-5.., LRR 1-5.. meets the
safety requirements of the Pressure Equipment Directive (PED). The conductivity control & monitoring
equipment is EU type approved according to EN 12952/EN 12953. These Directives state, among other
things, the requirements made on limiting systems and equipment for steam boiler plants and
(pressurised) hotwater installations.

8
LRR 1-50, LRR 1-51
Supply voltage
24 VDC +/– 20%
Fuse
external 0.5 A (semi-delay)
Power consumption
4 VA
Reset hysteresis
MAX limit: – 3 % of the adjusted MAX limit, fixed setting
Outputs
2 volt-free change-over contacts, 8 A 250 V AC / 30 V DC cos ϕ= 1
(continuous blowdown valve OPEN, OPERATING, CLOSED).
1 volt-free change-over contact, 8 A 250 V AC / 30 V DC cos ϕ= 1
(MAX alarm, switch-selectable).
Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression
1 analogue output 4-20 mA, max. load 500 ohm, e. g. for actual-value indication
Indicators and adjustors
1 rotary button with integrated pushbutton for parameter setting and testing MAX alarm
1 seven-segment LED display, four digits, green
1 red LED for MAX alarm,
2 amber LEDs indicating continuous blowdown valve opens/closes
1 four-pole code switch for configuration settings
Housing
Housing material: base: polycarbonate, black; front: polycarbonate, grey
Conductor size: 1 x 4,0 mm² solid per wire or 1 x 2.5 mm2per stranded wire with sleeve to DIN 46228
or 2 x 1.5 mm2per stranded wire with sleeve to DIN 46228 (min. ∅0.1 mm)
terminal strips can be detached separately
Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety
Pollution degree 2 for installation in control cabinet with protection IP 54, completely insulated
Protection
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
Weight
approx. 0.2 kg
Technical data

9
Only LRR 1-50
Only LRR 1-51
Connection of conductivity transmitter
1 analogue input 4-20 mA, e. g. for conductivity transmitter LRGT 1.-.., 2 poles with screen.
Lower end of measuring range SinL
0.5 - 100.0 μS/cm, adjustable.
Upper end of measuring range SinH
20.0 - 100.0 - 200.0 - 500.0 -1000.0 - 2000.0 - 3000.0 - 5000.0 - 6000.0 - 7000.0 - 10000.0 μS/cm,
adjustable.
LRR 1-50, LRR 1-51
Ambient temperature
when system is switched on: 0 ... 55 °C,
during operation: –10 ... 55 °C
Transport temperature
–20 ... +80 °C (<100 hours), defrosting time of the de-energized equipment before it can be put into
operation: 24 hours.
Storage temperature
–20 ... +70 °C, defrosting time of the de-energized equipment before it can be put into operation:
24 hours.
Relative humidity
max. 95%, no moisture condensation
Approvals:
TÜV certificate VdTÜV Bulletin “Wasserüberwachung” (= Water Monitoring 100):
Requirements made on water monitoring equipment
Type approval no. TÜV · WÜL · 12-017 (see nameplate)
Scope of supply
LRR 1-50
1 Conductivity switch LRR 1-50
1 Adhesive plate ppm
1 Installation manual
LRR 1-51
1 Conductivity switch LRR 1-51
1 Adhesive plate ppm
1 Installation manual
Technical data – continued –
Connection of conductivity electrode
1 input for conductivity electrode LRG 1.-.. (cell constant 1 cm-1), 3 poles with screen or
1 input for conductivity electrode LRG 16-9 (cell constant 0.5 cm -1), with integrated resistance
thermometer Pt 100, 3 poles with screen.
Measuring voltage
0.8 Vss, pulse duty factor tv = 0.5, frequency 20-10000 Hz.
Measuring range
1 to 10000 μS/cm at 25 °C or 1 to 5000 ppm at 25 °C.

10
Protection
Technical data
Name plate / marking
Nameplate LRR 1-50, LRR 1-51 on top
Safety
note
Output
contacts
Ambient
temperature
Type
designation Manufacturer
Fig. 1
Supply
voltage
Fuse,
provided
on site
Power
consumption
Disposal
note
Type approval no.
Connection
for conductivity
electrode
Type approval no.
Measuring
range
External fuse for
output contacts
Nameplate LRR 1-50 below
Connection
actual value
output
Supply
voltage
Fuse,
provided
on site
Power
consumption
Disposal
note
Type approval no.
Connection for
conductivity
transmitter
Type approval no.
Nameplate LRR 1-51 below
Connection
actual value
output
– continued –

11
In control cabinet: Installing the conductivity controller
Dimensions LRR 1-50, LRR 1-51
Fig. 2
1Upper terminal strip
2Lower terminal strip
Key
Installation in control cabinet
The conductivity controller LRR 1-50, LRR 1-51 is clipped onto the support rail type TH 35, EN 60715 in
the control cabinet. Fig. 1 4
3Housing
4Supporting rail type TH 35, EN 60715
4 3
1
2
46
74
120 15

12
In control cabinet: Wiring the conductivity controller
Wiring diagram for conductivity controller LRR 1-50
5Connection of supply voltage 24 V DC with fuse
0.5 A (semi-delay) provided on site
6Actual value output 4-20 mA
7Conductivity electrode LRG 1.-.. (Terminal 6/7:
resistance thermometer can be connected)
8Central earthing point (CEP) in control cabinet
Key
9Conductivity electrode LRG 16-9 with
integrated resistance thermometer
0MAX output contact
aSupply voltage L 2
bSupply voltage N
OPEN
OPERATING
CLOSED
Actuator EF
M 0.5 A M 0.5 A
5
8
b
7
6
8
9
5
a
0
L2 must remain live after the burner (stand-
by operation) - and therefore also the supply
voltage for the controller - is shut down until
the actuator has closed the continuous blow-
down valve.
Fig. 3
6

13
In control cabinet: Wiring the conductivity controller
Wiring diagram for conductivity controller LRR 1-51
Key
8
b
5 76
a
0
Fig. 4
L2 must remain live after the burner (stand-
by operation) - and therefore also the supply
voltage for the controller - is shut down until
the actuator has closed the continuous blow-
down valve.
– continued –
OPEN
OPERATING
CLOSED
Actuator EF
M 0.5 A
5Connection of supply voltage 24 V DC with fuse
0.5 A (semi-delay) provided on site
6Actual value output 4-20 mA
7Conductivity transmitter LRGT 1.-.., 4-20 mA, with
earthing point
8Central earthing point (CEP) in control cabinet
0MAX output contact
aSupply voltage L 2
bSupply voltage N

14
Connecting conductivity electrode LRG 12-2, LRG 16-4, LRG 17-1 and LRG 19-1,
resistance thermometer TRG 5-..
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm2
e.g. LiYCY 4 x 0.5 mm2.
Wire terminal strip in accordance with the wiring diagram. Fig. 3
Connect the screen to the central earthing point (CEP) in the control cabinet.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connection of supply voltage
The equipment is supplied with 24 V DC and fused with an external semi-delay fuse 0.5 A. Please use a
safety power supply unit with safe electrical isolation.
The power supply unit must be electrically isolated from dangerous contact voltages and must
meet at least the requirements on double or reinforced isolation according to one of the following
standards: DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
Connecting output contacts
Wire the upper terminal strip 1(terminals 16 - 23) according to the desired switching functions.
Provide an external slow-blow fuse 2.5 A for the output contacts. When switching off inductive loads,
voltage spikes are produced that may impair the operation of control and measuring systems. Connected
inductive loads must be provided with suppressors such as RC combinations as specified by the manu-
facturer.
When used as conductivity limiter the conductivity controller LRR 1-50, LRR 1-51 does not interlock
automatically when the readings exceed the MAX limit.
If an interlock function is required for the installation it must be provided in the follow-up circuitry
(safety circuit). The circuitry must meet the requirements of the EN 50156.
The conductivity electrode LRG 16-9 is equipped with a sensor plug-in connection type M 12, with 5
poles, A-coded, pin assignment see Fig. 3. For connecting the equipment preconfigured control cable
assemblies (with male and female connectors) of various lengths are available as add-on equipment.
To connect the conductivity controller LRR 1-50 remove the connector and wire the terminal strip
according to the wiring diagram. Fig. 3.
Connect the screen to the central earthing point (CEP) in the control cabinet.
If you do not use the prefabricated control cable assembly, use screened five-core control cable,
e. g. LiYCY 5 x 0.5 mm2for connecting the equipment. In addition, connect at the electrode end a
screened female connector to the control cable.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connection of conductivity electrode LRG 16-9
In control cabinet: Wiring the conductivity controller – continued –

15
Connection of conductivity transmitter LRGT 1.-..
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm²,
e. g. LiYCY 4 x 0.5 mm2, max. length 100 m.
Wire terminal strip in accordance with the wiring diagram. Fig. 4
Wire screen in accordance with the wiring diagram.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connection of actual-value output
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm2,
e. g. LiYCY 2 x 0.5 mm2, max. length: 100 m.
Please observe the max. load of 500 ohm.
Wire terminal strip in accordance with the wiring diagram. Fig. 3, 4
Connect the screen only once to the central earthing point (CEP) in the control cabinet.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Any item of equipment that you want to connect to the terminals for the actual-value output 4 - 20 mA
(option) must be certified to have at least double or reinforced isolation according to DIN EN 50178 or
DIN EN 61010-1 or DIN EN 60730-1 or DIN EN 60950 (safe electrical isolation) between the current loop
and live parts of the equipment that are not supplied with safety extra-low voltage (SELV).
Attention
nDo not use unused terminals as support point terminals.
Tools
n Screwdriver, size 3.5 x 100 mm, completely insulated according to VDE 0680-1.
In control cabinet: Wiring the conductivity controller – continued –

16
Connection of conductivity transmitter LRGT 1.-..
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm2
e.g. LiYCY 4 x 0.5 mm2, max. length: 100 m.
Wire terminal strip in accordance with the wiring diagram. Fig. 4
Wire screen in accordance with the wiring diagram.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
In the plant: Wiring the conductivity electrode / transmitter
Connecting conductivity electrode LRG 12-2, LRG 16-4, LRG 17-1 and LRG 19-1,
resistance thermometer TRG 5-..
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm2
e.g. LiYCY 4 x 0.5 mm2.
Wire terminal strip in accordance with the wiring diagram. Fig. 3
Connect the screen only once to the central earthing point (CEP) in the control cabinet.
Max. cable length between conductivity electrode / resistance thermometer and conductivity
controller: 30 m, with conductivities from 1 to 10 μS/cm: max. 10 m.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
The conductivity electrode LRG 16-9 is equipped with a sensor plug-in connection type M 12, with 5
poles, A-coded, pin assignment see Fig. 3. For connecting the equipment preconfigured control cable
assemblies (with male and female connectors) of various lengths are available as add-on equipment.
Note that the recommended control cable is not UV-resistant and, if installed outdoors, must be
protected by a UV-resistant plastic tube or cable duct.
To connect the conductivity controller LRR 1-50 remove the connector and wire the terminal strip
according to the wiring diagram. Fig. 3
Connect the screen only once to the central earthing point (CEP) in the control cabinet.
If you do not use the prefabricated control cable assembly, use screened five-core control cable, e. g.
LiYCY 5 x 0.5 mm2for connecting the equipment. In addition, connect at the electrode end a screened
female connector to the control cable.
Max. cable length between conductivity electrode and controller: 30 m, with conductivities from
1 to 10 μS/cm: max. 10 m.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connection of conductivity electrode LRG 16-9
Attention
nTo commission the equipment please refer to the installation & operating manuals for
LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1, LRG 19-1, TRG 5-.. and LRGT 1.-..
nMake sure that connecting cables leading to the equipment are segregated and run
separately from power cables.
n Check the connection of the screen to the central earthing point (CEP) in the control cabinet.
nThe conductivity transmitter must be separately connected to its own voltage supply.

17
Factory settings
Conductivity controller LRR 1-50
nMAX switchpoint AL.Hi = 6000 μS/cm
nSetpoint SP = 3000 μS/cm
nDead band: +/– 5 % of setpoint
nReset hysteresis:
Setpoint: –10 % of the setpoint
MAX limit: –3 % (fixed setting)
n Correction factor CF = 1 
n Temperature compensation inP: No
n Temperature coefficient tC = 2.1 % / °C
n Standardizing the current output Sout =
6000 μS/cm
nPurging pulse Si = 0 h
nPurging duration Sd = 3 minutes (valve opens
3 min and closes 3 min)
nCode switch a: S 2 ON, S1, S3, S4 OFF
Conductivity controller LRR 1-51
nMAX switchpoint AL.Hi = 6000 μS/cm
nSetpoint SP = 3000 μS/cm
nDead band: +/– 5 % of setpoint
nReset hysteresis:
Setpoint: –10 % of the setpoint
MAX limit: –3 % (fixed setting)
nLower end of measuring range SinL =
100 μS/cm
nUpper end of measuring range =
SinH 6000 μS/cm
nStandardizing the current output Sout =
6000 μS/cm
nPurging pulse Si = 0 h
nPurging duration Sd = 3 minutes (valve opens
3 min and closes 3 min)
nCode switch a: S 2, S3 ON, S1, S4 OFF

18
Changing factory settings
The upper terminal strip of the equipment is live during operation.
This presents the danger of electric shock!
Always cut off power supply to the equipment before mounting, removing or connecting
the terminal strips!
Danger
Switch selection of unit of measurement
The electrical conductivity is measured in µS/cm. In some countries ppm (parts per million) is used
instead. Conversion: 1 µS/cm = 0.5 ppm. Use code switch ato set the desired unit of measurement.
This unit setting is then applicable for all conductivity readings and settings. If you choose ppm as unit of
measurement, please stick the adhesive label supplied with the equipment onto the unit specification on
the housing.
To change the setting proceed as follows:
nInsert a screwdriver to the right and left of the arrow markings between the terminal strip and the
front frame.
n Unlock terminal strip on the left and right side. For this purpose move screwdriver in direction of the arrow.
nRemove the terminal strip.
nSet switch S4 of code switch ato ON = ppm (parts per million)
nRe-attach lower terminal strip.
nApply supply voltage. Equipment is restarted.
Fig. 4
a
Attention
Do not change the code switch asettings of S1, S2 and S3.
Tool
n Screwdriver, size 3.5 x 100 mm, completely insulated according to VDE 0680-1.

19
Operating the conductivity controller
Key to codes on seven-segment display
Fig. 5
Rotary button
with integrated
push-button
MAX LED red
5432 Seven-segment
display
LED 1
Valve opens
LED 2
Valve closes
Code Description
Indicated when rotary button is turned to the right:
AL.Hi Alarm High MAX switchpoint, adjustable between 1 and 9999 μS/cm
SP Setpoint Setpoint, adjustable between 1 and 9999 μS/cm
HySt Hysteresis Reset hysteresis, adjustable between 1 and 25 % of the setpoint
Indicated when in parameterization mode:
quit Quit Input not confirmed
done Done Input confirmed
Indicated if malfunctions occur:
E.001 Error Temperature sensor defective, temperature reading too low
E.002 Error Temperature sensor defective, temperature reading too high
E.005 Error Sensor defective, measured value too low
E.006 Error Sensor defective, measured value too high
Only LRR 1-50
CF Correction
Factor
Correction factor, adjustable between 0.05
and 5,000, adjustable in increments of 0.001
inP input Pt 100 Temperature compensation YES (no)
tC Temperature
coefficient
Temperature coefficient Tk 0.0 – 3.0 %
per °C, adjustable in increments of 0.1
Only LRR 1-51
Sin.L Lower end of measuring range, adjustable
0.0 - 0.5 - 100.0 μS/cm
Sin.H
Upper end of measuring range, adjustable
20.0 - 100.0 - 200.0 - 500.0 -1000.0 -
2000.0 - 3000.0 - 5000.0 - 6000.0 -
7000.0 - 9999.0 μS/cm
Sout Standardization of current output adjustable between 1 and
9999 μS/cm
Si Purging pulse, adjustable between 0 and 24 hrs in steps of 1 h.
Sd Purging duration, adjustable between 1 and 4 minutes, in steps
of 1 min.
tESt Test Tests output relays

20
Commissioning procedure
Setting parameters
Fig. 5
Rotary button
with integrated
push-button
MAX LED red
5432 Seven-segment
display
LED 1
Valve opens
LED 2
Valve closes
Start
Activity Display Function
Switch on supply
voltage.
Seven-segment display shows equip-
ment and software version System test, takes approx. 3 sec.
Seven-segment display shows actual
value, LEDs are illuminated System switches to operating mode
Actual value <
setpoint
1. LED 1 (indicating "Valve opens") is
flashing. 2. LED 2 (indicating "Valve
closes") is flashing
The continuous blowdown valve opens during the
purging pulse (Sd) and then moves back to the
OPERATING position.
Actual value >
setpoint
1. LED 1 (indicating "Valve opens") is
flashing. 2. LED 2 (indicating "Valve
closes") is flashing
The continuous blowdown valve opens. Once the con-
ductivity has fallen below the adjusted hysteresis HySt,
the valve is motored into the OPERATING position.
Setting parameters
Activity Seven-segment display Function
Turn rotary button until the
desired parameter is indicated.
Display toggles between parameter
and the saved value setting. For selecting the parameter
Press and hold down the push-
button (of the rotary button) First digit (0000) flashing. Parameterization mode active. You can
change the first digit.
Turn rotary button. A new value is indicated. To increase the value turn rotary button to
the right, to decrease turn it to the left.
Press push-button.
Each time you press the but-
ton the system moves to the
next digit.
2nd, 3rd or 4th digit is flashing.
(from right to left)
2nd, 3rd or 4th digit can be changed by
turning the rotary button. To increase the
value turn rotary button to the right, to
decrease turn it to the left.
If no further operation is
performed:
"quit" is indicated for a moment.
Then the display toggles between
parameter and the old value setting.
The system switches automatically back to
parameter and the input is not confirmed.
After the input has been fin-
ished: Press and hold down the
push-button.
"done" is indicated for a moment.
Then the display toggles between
parameter and the new value
setting.
The input is confirmed and the system
switches automatically back to parameter.
Turn rotary button until the next parameter is indicated.
Or turn the rotary button until the actual value is shown.
If no operation is performed the actual value will be indicated automatically after 30 sec.