GESTRA LRR 1-50 User manual

EN
English
Original Installation &
Operating Manual
819224-05
Conductivity Controller
LRR 1-50
LRR 1-51

2LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
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 “Wasserüberwachung 100” (Water Monitoring 100).........................................................7
LVD (Low Voltage Directive) and EMC (Electromagnetic Compatibility) .....................................................7
ATEX (Atmosphère Explosible) .................................................................................................................7
Notes on the Declaration of Conformity/Manufacturer’s Declaration ..................................................7
Technical data
LRR 1-50, LRR 1-51 ...............................................................................................................................8
LRR 1-50 only.........................................................................................................................................9
LRR 1-51 only.........................................................................................................................................9
LRR 1-50, LRR -51..................................................................................................................................9
Product package.....................................................................................................................................9
Name plate/identification ......................................................................................................................10
Installation
Installation in the door of the control cabinet .........................................................................................11
Dimensions of the LRR 1-50, LRR 1-51.................................................................................................12
Key .......................................................................................................................................................12
Installation in a control cabinet..............................................................................................................12
In the control cabinet: Wiring the conductivity controller
Wiring diagram for LRR 1-50 conductivity controller..............................................................................13
Key .......................................................................................................................................................13
Wiring diagram for LRR 1-51 conductivity controller..............................................................................14
Key .......................................................................................................................................................14
Supply voltage connection.....................................................................................................................15
Connection of output contacts...............................................................................................................15
Connecting an LRG 12-2, LRG 16-4, LRG 17-1 or LRG 19-1 conductivity electrode
and TRG 5-.. resistance thermometer....................................................................................................15
Connecting an LRG 16-9 conductivity electrode ....................................................................................15
Wiring diagram for LRGT 1.-.. conductivity transmitter ..........................................................................16
Connecting the actual value output ......................................................................................................16
Tools.....................................................................................................................................................16

3
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Contents
Page
continued
In the system: Wiring the conductivity electrode/transmitter
Connecting an LRG 12-2, LRG 16-4, LRG 17-1 or LRG 19-1 conductivity electrode
and TRG 5-.. resistance thermometer....................................................................................................17
Connecting an LRG 16-9 conductivity electrode ....................................................................................17
Wiring diagram for LRGT 1.-.. conductivity transmitter ..........................................................................17
Factory settings ..................................................................................................................................18
Changing the factory settings
Conductivity controller LRR 1-50, LRR 1-51 .........................................................................................19
Tools.....................................................................................................................................................19
Operating the conductivity controller
Meaning of codes on the 7-segment display .........................................................................................20
Bringing into service
Setting parameters................................................................................................................................21
LRR 1-50 conductivity controller: Setting switchpoints and parameters........................................... 22-23
LRR 1-51 conductivity controller: Setting switchpoints and parameters.................................................24
Operation, alarm and testing
Conductivity controllers LRR 1-50, LRR 1-51: Checking the displays and the function of the MAX
output contact.......................................................................................................................................25
Password protection..............................................................................................................................26
Troubleshooting
Indications, diagnosis and remedies......................................................................................................27
Further information
Action against high-frequency interference ...........................................................................................28
Replacing/taking the equipment out of service ......................................................................................28
Disposal................................................................................................................................................28

4LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Important notes
Usage for the intended purpose
The LRR 1-50, LRR 1-51 conductivity controller is used in combination with the LRG 1.-.. conductivity
electrodes and the LRGT 1.-.. conductivity transmitter as a conductivity controller and limit switch, e.g. in
steam boilers and hot water installations and in condensate and feedwater tanks. The conductivity con-
troller indicates when MAX conductivity is reached and opens or closes a continuous blowdown valve.
Conductivity controllers can be combined in a circuit with conductivity electrodes or transmitters as
follows: LRR 1-50 conductivity controller with LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1 and LRG 19-1
conductivity electrodes; LRR 1-51 conductivity controller with LRGT 16-1, LRGT 16-2, LRGT 16-3,
LRGT 16-4, LRGT 17-3 and LRGT 17-1 conductivity transmitters.
Continuous blowdown
As the boiler water begins to evaporate, the concentration of non-volatile total dissolved solids (TDS)
left behind in the boiler increases over time as a function of steam consumption. If the TDS concentra-
tion 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 super-
heaters. The consequences are adverse effects on reliability and severe damage to steam generating
units and pipes. To keep the TDS concentration within admissible limits, a certain portion of boiler
water must be removed continuously or periodically (by means of a continuous blowdown valve) and
fresh feedwater must be added to the boiler feed to compensate for the water lost through blowdown.
To determine the TDS 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.
Operating position of the continuous blowdown valve
It is common practice to use the continuous blowdown valve to remove a certain amount of water from
the boiler to keep the TDS within the desired limits. This means that the valve must be slightly open
during operation, so that this water can be discharged (valve in OPERATING position). This operating
position can be set on the continuous blowdown valve, and the amount of boiler blowdown can be
established with the aid of the valve capacity charts.
Switching hysteresis
The controller works as a 2-position controller, which means that the continuous blowdown valve is
moved into OPEN position when the set point is reached. The conductivity must then decrease. Once it
has fallen to a level that is lower than the set point minus the defined hysteresis, the valve is moved into
OPERATING position.
Temperature compensation
The electrical 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 25 °C,
and to correct the measured conductivity using the temperature coefficient tC.
Cell constant and correction factor
The geometric variable (cell constant) of the conductivity electrode 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. Deviations can be compensated by changing the correction factor CF.
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 Si) and opened for a certain
time (flushing time Sd). After the flushing time, the valve is moved into the OPERATING position or into
the required control position.
Glossary

5
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Important notes
Function
In combination with the LRG 1.-.. conductivity electrode, the LRR 1-50 conductivity controller meas-
ures the electrical conductivity of conductive fluids. The LRG 1.-.. conductivity electrode or the LRG 16-9
electrode with integrated resistance thermometer is connected for measuring the fluid temperature.
A separate Pt100 resistance thermometer may also be used to measure the temperature.
The LRR 1-51 conductivity controller processes the current signal from the LRGT 1.-.. conductivity
transmitter, which varies depending on the conductivity. This signal is normalised in the conductivity
controller as a function of the adjusted measuring range and shown as an actual value on the 7-segment
LED display.
LRR 1-50 conductivity controller: When the LRG 1.-.. conductivity electrode is connected, a refer-
ence measurement is taken and the conductivity reading is then adapted to the installation conditions by
adjusting correction factor CF.
If a resistance thermometer is connected, the water temperature is measured as well as the conductiv-
ity. The conductivity reading is then automatically compensated in the conductivity controller based on
the adjusted temperature coefficient tC (%/°C). If the temperature changes, thanks to linear tempera-
ture compensation the reading is referenced to 25 °C across the entire measurement range, and shown
as an actual value on the 7-segment LED display.
The LRR 1-50, LRR 1-51 conductivity controller works as a 2-position controller, i.e. the continuous
blowdown valve is moved into OPEN position when the set point is reached. After the conductivity has
fallen by the set hysteresis, the valve returns to 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 adjusted as long as it remains within the measuring range.
If the MAX limit is reached, the MAX output contact switches and the MAX LED lights up. It switches
back when the conductivity has fallen below the set hysteresis.
Faults or malfunctions in the conductivity electrode or conductivity transmitter, the electrical connection
or the settings are indicated as error codes on the 7-segment LED display. In the event of a malfunction,
the MAX alarm is triggered and the continuous blowdown valve moves into OPERATING position.
If malfunctions occur only in the LRR 1-50, LRR 1-51 conductivity controller, the MAX alarm is trig-
gered, the continuous blowdown valve moves into OPERATING position and the equipment is restarted.
Parameters can be changed or the MAX alarm simulated using the rotary knob.
Electrical conductivity is measured in µS/cm. In some countries, ppm (parts per million) is used instead.
Conversion 1 µS/cm = 0.5 ppm. The conductivity controller can be set as appropriate.
continued

6LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Safety note
The equipment may only be installed, wired and brought into service by qualified and competent staff.
Maintenance and setup work may only be performed by authorised staff who have undergone specific
training.
Danger
The terminal strips of the equipment are live during operation.
There is a risk of serious injury due to electric shock!
Always cut off power to the equipment before working
on the terminal strips (installation, removal, connecting cables).
Attention
The name plate indicates the technical features of the equipment. Do not bring into ser-
vice or operate any equipment that does not bear its own specific name plate.
Important notes continued

7
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Directives and standards
ATEX (Atmosphère Explosible)
The equipment must not be used in potentially explosive atmospheres, in accordance with European
Directive 2014/34/EU.
LVD (Low Voltage Directive) and EMC (Electromagnetic Compatibility)
The equipment conforms to the requirements of the Low Voltage Directive 2014/35/EU and the
EMC Directive 2014/30/EU.
Notes on the Declaration of Conformity/Manufacturer’s Declaration
For details on the conformity of our equipment with European Directives, please refer to our Declaration
of Conformity or our Manufacturer's Declaration.
The current Declaration of Conformity/Manufacturer's Declaration is available in Documents at
www.gestra.com or can be requested from us.
Note
LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1 and LRG 19-1 conductivity electrodes are sim-
ple items of electrical equipment as specified in EN 60079-11 section 5.7. According to
European Directive 2014/34/EU, the equipment may be used in potentially explosive at-
mospheres only in combination with approved Zener barriers. Suitable for use in Ex zones
1 and 2 (1999/92/EU).
The equipment does not have Ex classification.
VdTÜV Bulletin “Wasserüberwachung 100” (Water Monitoring 100)
The LRR 1-50, LRR 1-51 conductivity controller, in combination with the LRG 1.-.. conductivity elec-
trode and LRGT 1.-.. conductivity transmitter, has type approval in accordance with VdTÜV Bulletin
“Wasserüberwachung 100”. The VdTÜV Bulletin “Wasserüberwachung 100” describes the require-
ments for water monitoring equipment.
EU Pressure Equipment Directive 2014/68/EU
The LRG 1.-.., LRGT 1.-.., LRS 1-5.., LRR 1-5.. conductivity control and monitoring equipment satisfies
the safety requirements of the EU Pressure Equipment Directive. The conductivity control and monitor-
ing equipment has EC type approval in accordance with EN 12952/EN 12953. These Directives state,
among other things, the requirements for limiting systems and equipment for steam boiler and hot
water installations.

8LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
LRR 1-50, LRR 1-51
Supply voltage
24 VDC +/– 20%
Fuse
External semi-delay 0.5A
Power consumption
4 W
Reset hysteresis
MAX limit: –3% of set MAX limit, fixed.
Outputs
2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos ϕ= 1
(continuous blowdown valve OPEN, OPERATING, CLOSED).
1 volt-free relay contact, 8 A 250 V AC / 30 V DC cos ϕ= 1 (MAX alarm, switch-selectable).
Inductive loads must have interference suppression (RC combination) as per the manufacturer's
specification.
1 analogue output 4-20 mA, max. output load 500 ohms, e.g. for actual value indication.
Indicators and controls
1 rotary knob with integrated pushbutton for testing the MAX alarm and setting parameters,
1 seven-segment, four-digit LED display,
1 red LED for MAX alarm,
2 amber LEDs for continuous blowdown valve opening/closing,
1 four-pole code switch for configuration.
Housing
Housing material: base of black polycarbonate; front of grey polycarbonate
Conductor size: 1 x 4.0 mm2solid 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 removed separately
Housing attachment: Mounting clip on support rail TH 35, EN 60715
Electrical safety
Pollution degree 2 for installation in control cabinet with protection rating IP 54, fully insulated
IP rating
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
With panel adapter: IP 65 to EN 60529
Weight
Approx. 0.2 kg
Technical data

9
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
LRR 1-50 only
Connecting a conductivity electrode
1 input for LRG 1.-.. conductivity electrode (cell constant 1 cm-1), 3-pole with shield, or
1 input for LRG 16-9 conductivity electrode (cell constant 0.5 cm-1), with integrated resistance ther-
mometer Pt100, 3-pole with shield.
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.
Technical data
LRR 1-51 only
Connecting a conductivity transmitter
1 analogue input 4-20 mA, e.g. for LRGT 1.-.. conductivity transmitter, 2-pole with shield.
Lower end of measuring range SinL
0 - 0.5 - 50 - 100 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 -
12000.0 μS/cm, adjustable.
LRR 1-50, LRR -51
Ambient temperature
when system is switched on 0 ... 55 °C
in operation –10 ... 55 °C
Transport temperature
–20 ... +80 °C (< 100 hours), only switch on after a defrosting period of 24 hours.
Storage temperature
–20 ... +70 °C, only switch on after a defrosting period of 24 hours.
Relative humidity
max. 95%, non-condensing
Approvals:
TÜV Certificate VdTÜV Bulletin “Wasserüberwachung 100” (= Water Monitoring 100):
Requirements for water monitoring equipment
Type approval number: TÜV · WÜL · XX-017
Product package
LRR 1-50
1 conductivity controller LRR 1-50
1 adhesive sign for ppm
1 Installation & Operating Manual
LRR 1-51
1 conductivity controller LRR 1-51
1 adhesive sign for ppm
1 Installation & Operating Manual
continued

10 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
IN
4-20mA LRGT 1..-..
+
_
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
1 2 3 4 6 7 8
TÜV.WÜL. -017XX
5
_
24V
±20%
0525
Absalzregler
Continuous Blowdown Controller Régulateur de déconcen- tration continue
LRR 1-51
Betriebsanleitung beachten See installation instructions Voir instructions de montage
  

L2
Tamb = 55°C (131°F)T
250V ~ T2,5A
IP (IP20)40
GESTRA AG Münchener Str.77 28215 Bremen Made in Germany
Absalzregler
Continuous Blowdown Controller Régulateur de déconcen- tration continue
LRR 1-50
Betriebsanleitung beachten See installation instructions Voir instructionsde
montage
  

L2
250V ~ T2,5A
IP (IP20)40
Tamb = 55°C (131°F)T
GESTRA AG Münchener Str.77 28215 Bremen Made in Germany
LRG
Pt100
1..-..
1-5000ppm 1-10000µS/cm
+
_
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
1 2 3 4 6 7 8 5
TÜV.WÜL. -017XX
_
24V
±20%
0525
IP rating
Absalzregler
Continuous Blowdown Controller Régulateur de déconcen- tration continue
LRR 1-50
Betriebsanleitung beachten See installation instructions Voir instructionsde
montage
  

L2
250V ~ T2,5A
IP (IP20)40
Tamb = 55°C (131°F)T
GESTRA AG Münchener Str.77 28215 Bremen Made in Germany
LRG
Pt100
1..-..
1-5000ppm 1-10000µS/cm
+
_
OUT 4-20mA
500Ω
+
_
M0,5A
4W +
1 2 3 4 6 7 8 5
TÜV.WÜL. -017XX
_
24V
±20%
0525
Technical data
Name plate/identification
Name plate of LRR 1-50, LRR 1-51, top
Safety
note
Output
contacts
Ambient
temperature
Type
designation
Manufacturer
Fig. 1
Supply
voltage
Fuse,
provided
on site
Power
consumption
Disposal
note
Connection
of conductivity
electrode
Type approval number
Measuring
range
External fuse for
output contacts
Name plate of LRR 1-50, bottom
Connection
of actual
value output
Supply
voltage
Fuse,
provided
on site
Power
consumption
Disposal
note
Connection
of conductivity
transmitter
Type approval number
Name plate of LRR 1-51, bottom
Connection
of actual
value output
continued

11
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Installation
The small panel adapter with rotary knob, stock code 441553, enables the controller to be installed in
the door of a control cabinet.
The advantage of using the adapter is that the status is visible and alarms can be tested without open-
ing the control cabinet door. When installed, the adapter has a rating of IP65. Please refer to the panel
adapter Installation & Operating Manual 850625-xx for further information.
Installation in the door of the control cabinet

12 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Installation
Dimensions of the LRR 1-50, LRR 1-51
Fig. 2
1Upper terminal strip
2Lower terminal strip
Key
Installation in a control cabinet
The LRR 1-50, LRR 1-51 conductivity controller is clipped onto a type TH 35, EN 60715 support
rail in the control cabinet. Fig. 1 4
3 Housing
4Support rail TH 35, EN 60715
4 3
1
2
46
74
120 15
continued

13
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
In the control cabinet: Wiring the conductivity controller
Wiring diagram for LRR 1-50 conductivity controller
5Connection of supply voltage 24 V DC
with semi-delay fuse 0.5A provided on site
6Actual value output 4-20 mA
7 LRG 1.-.. conductivity electrode (terminal 6/7:
resistance thermometer can be connected)
8Central earthing point (CEP) in control cabinet
Key
9LRG 16-9 conductivity electrode with
integrated resistance thermometer
0MAX output contact
aSupply voltage L2
bSupply voltage N
OPERATING
OPEN CLOSED
Actuator EF
0.5A
(semi-
delay)
0.5A
(semi-
delay)
5
8
b
7
6
8
9
5
a
0
When the burner is switched off (standby) and
therefore also the power supply to the control-
ler, L2 must remain on until the actuator has
closed the continuous blowdown valve.
Fig. 3
6

14 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
In the control cabinet: Wiring the conductivity controller
Wiring diagram for LRR 1-51 conductivity controller
5Connection of supply voltage 24 V DC
with semi-delay fuse 0.5A provided on site
6Actual value output 4-20 mA
7 LRGT 1.-.. conductivity transmitter, 4-20 mA,
with earthing point
8Central earthing point (CEP) in control cabinet
Key
0MAX output contact
aSupply voltage L2
bSupply voltage N
OPERATING
OPEN
CLOSED
Actuator EF
0.5A
(semi-
delay)
8
b
5 76
a
0
Fig. 4
When the burner is switched off (standby) and
therefore also the power supply to the control-
ler, L2 must remain on until the actuator has
closed the continuous blowdown valve.
continued

15
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Connecting an LRG 12-2, LRG 16-4, LRG 17-1 or LRG 19-1 conductivity electrode and TRG 5-..
resistance thermometer
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5 mm2, e.g. LiYCY 4 x 0.5 mm2.
Wire the terminal strip as shown in the wiring diagram. Fig. 3
Connect the shield to the central earthing point (CEP) in the control cabinet.
Route the connecting cable between items of equipment separately from power lines.
In the control cabinet: Wiring the conductivity controller
Supply voltage connection
The equipment is supplied with 24 V DC and has an external semi-delay 0.5A fuse. Please use a safety
power supply unit with reliable electrical isolation.
This power supply unit must provide a level of isolation from dangerous contact voltages that at least
meets the requirements for double or reinforced insulation in accordance with one of the following
standards: DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
Connection of output contacts
Wire the upper terminal strip 1(terminals 16-23) in line with the desired switching functions.
Provide an external slow-blow 2.5A fuse for the output contacts.
Switching off inductive loads produces surges that can have a major adverse effect on the operation
of open and closed-loop control systems. Connected inductive loads must therefore have interference
suppression (RC combination) as per the manufacturer's specifications.
If used as a conductivity limiter, the LRR 1-50, LRR 1-51 conductivity controller does not interlock auto-
matically when the MAX limit is exceeded.
If the installation requires a lockout function, this must be implemented in the downstream (safety)
circuit. This circuit must conform to the requirements of EN 50156.
The LRG 16-9 conductivity electrode features an M12 A-coded, 5-pole sensor connector, see pin as-
signment in Fig. 3. A pre-wired control cable (with plug and socket) is available in various lengths as
an accessory for connecting the equipment.
To connect the LRR 1-50 conductivity controller, please remove the connector and wire the terminal
strip as shown in the wiring diagram. Fig. 3.
Connect the shield to the central earthing point (CEP) in the control cabinet.
If you are not using the pre-wired control cable, use a 5-core shielded control cable as a connecting
cable, e.g. LiYCY 5 x 0.5mm2. In addition, connect a shielded socket to the control cable at the elec-
trode end.
Route the connecting cable between items of equipment separately from power lines.
Connecting an LRG 16-9 conductivity electrode
continued

16 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Wiring diagram for LRGT 1.-.. conductivity transmitter
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5mm2, e.g. LiYCY 4 x 0.5mm2, maximum length 100m.
Wire the terminal strip as shown in the wiring diagram. Fig. 4
Connect the shield as shown in the wiring diagram.
Route the connecting cable between items of equipment separately from power lines.
In the control cabinet: Wiring the conductivity controller
Connecting the actual value output
For connection, please use a shielded, multi-core control cable with a minimum conductor size of
0.5 mm2, e.g. LiYCY 2 x 0.5mm2, maximum length 100m.
Please note the maximum output load of 500 ohms.
Wire the terminal strip as shown in the wiring diagram. Fig. 3, 4
Connect the shield just once to the central earthing point (CEP) in the control cabinet.
Route the connecting cable between items of equipment separately from power lines.
Any item of equipment that you wish to connect to the terminals for the 4-20 mA actual value output
(optional) must be certified to have at least double or reinforced insulation to DIN EN 50178 or DIN
61010-1 or DIN EN 60730-1 or DIN EN 60950 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 terminals.
Tools
nScrewdriver size 3.5 x 100 mm, fully insulated to VDE 0680-1.
continued

17
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Wiring diagram for LRGT 1.-.. conductivity transmitter
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5mm2, e.g. LiYCY 4 x 0.5mm2, maximum length 100m.
Wire the terminal strip as shown in the wiring diagram. Fig. 4
Connect the shield as shown in the wiring diagram.
Route the connecting cable between items of equipment separately from power lines.
In the system:
Wiring the conductivity electrode/transmitter
Connecting an LRG 12-2, LRG 16-4, LRG 17-1 or LRG 19-1 conductivity electrode
and TRG 5-.. resistance thermometer
To connect the equipment, please use a shielded, multi-core control cable with a minimum conductor
size of 0.5mm2, e.g. LiYCY 4 x 0.5mm2.
Wire the terminal strip as shown in the wiring diagram. Fig. 3
Connect the shield to the central earthing point (CEP) in the control cabinet.
The max. cable length between the conductivity electrode/resistance thermometer and conduc-
tivity controller is 30 m, or max. 10 m with a conductivity of 1-10 μS/cm.
Route the connecting cable between items of equipment separately from power lines.
The LRG 16-9 conductivity electrode features an M12 A-coded, 5-pole sensor connector, see pin as-
signment in Fig. 3. A pre-wired control cable (with plug and socket) is available in various lengths as
an accessory for connecting the equipment.
This control cable is not UV-resistant and must be protected with a UV-resistant plastic tube or
cable duct if the equipment is installed outdoors.
To connect the LRR 1-50 conductivity controller, please remove the connector and wire the terminal
strip as shown in the wiring diagram. Fig. 3
Connect the shield to the central earthing point (CEP) in the control cabinet.
If you are not using the pre-wired control cable, use a 5-core shielded control cable as a connecting
cable, e.g. LiYCY 5 x 0.5mm2. In addition, connect a shielded socket to the control cable at the elec-
trode end.
The max. cable length between the conductivity electrode and controller is 30 m, or max. 10 m
with a conductivity of 1-10 μS/cm.
Route the connecting cable between items of equipment separately from power lines.
Connecting an LRG 16-9 conductivity electrode
Attention
nPlease start up the equipment as described in the Installation & Operating Manuals for
the LRG 12-2, LRG 16-4, LRG 16-9, LRG 17-1, LRG 19-1, TRG 5-.. and LRGT 1.-..
n Route the connecting cable between items of equipment separately from power lines.
nCheck the shield connection to the central earthing point (CEP) in the control cabinet.
nThe conductivity transmitter must be connected to its own dedicated supply voltage.

18 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Factory settings
Conductivity controller LRR 1-50
nMAX switchpoint AL.Hi = 6000 μS/cm
nSet point SP = 3000 μS/cm
nDead band: +/– 5% of set point
nReset hysteresis:
Set point: –10% of set point
MAX limit: –3% (fixed)
n Correction factor CF = 1
n Temperature compensation inP = NO (no)
n Temperature coefficient tC = 2.1%/°C
n Current output normalisation Sout =
6000 μS/cm
nFlushing interval Si = 0 h
nFlushing time Sd= 3 min (valve opens for
3 min then closes for 3 min)
nDamping FiLt: oFF
nPassword PW: oFF
nCode switch a:
S1=OFF, S2=ON, S3=OFF, S4=OFF
Conductivity controller LRR 1-51
nMAX switchpoint AL.Hi = 6000 μS/cm
nSet point SP = 3000 μS/cm
nDead band: +/– 5% of set point
nReset hysteresis:
Set point: –10% of set point
MAX limit: –3% (fixed)
nLower end of measuring range Sin.L =
0.5 μS/cm
nUpper end of measuring range Sin.H =
6000 μS/cm
nCurrent output normalisation Sout =
6000 μS/cm
nFlushing interval Si = 0 h
nFlushing time Sd= 3 min (valve opens for
3 min then closes for 3 min)
nDamping FiLt: oFF
nPassword PW: oFF
nCode switch a:
S1=OFF, S2=ON, S3=OFF, S4=OFF

19
LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Changing the factory settings
The upper terminal strip of the equipment is live during operation.
There is a risk of serious injury due to electric shock!
Always cut off power to the equipment before working on the terminal strip (installation,
removal, connecting cables).
Danger
Attention
Do not change the settings of switches S1 and S2 on code switch a!
Tools
nScrewdriver size 3.5 x 100 mm, fully insulated to VDE 0680-1.
Code switch D- sliding switch, white
Conductivity controller LRR 1-50, LRR 1-51
Code switch D
S1 S2 S3 * S4 Configuration
OFF Reserve (factory setting)
ON Reserve
OFF Reserve
ON Reserve (factory setting)
OFF Terminal 3/4 (Out 2) as actual value output (X)
(factory setting) *
ON Terminal 3/4 (Out 2) as manipulated variable output (Yw) *
OFF Electrical conductivity measured in µS/cm
(factory setting)
ON Electrical conductivity measured in ppm
* Controller software version 311178.13 or later

20 LRR 1-50, LRR 1-51 - Installation & Operating Manual - 819224-05
Operating the conductivity controller
Meaning of codes on the 7-segment display
Fig. 4
Code Meaning
Appears when rotary knob is turned clockwise:
AL.Hi Alarm High MAX switchpoint, adjustable between 1 and 9999 μS/cm
SP Set point Set point, adjustable between 1 and 9999 μS/cm
HySt Hysteresis Reset hysteresis, adjustable between 1 and 25% of set point
FiLt Filter Filter is switched on/off (damping)
PW Password on = password protection is enabled
oFF = password protection is disabled
Factory setting 1902 (cannot be changed)
Appears in parameterization mode
quit Quit Input is not confirmed
done Done Input is confirmed
Appears in the event of malfunctions
E.001 Error Temperature sensor defective, temperature reading too low
E.002 Error Temperature sensor defective, temperature reading too high
E.005 Error Acquired reading defective, reading too low
E.006 Error Acquired reading defective, reading too high
LRR 1-50 only
CAL Electrode calibration Electrode calibration. Last reading is displayed
CF Correction factor
Adjustable between 0.05 and 5.000 in increments of 0.001
inP Input Pt100 Temperature compensation YES (no)
tC Temperature coefficient Tc 0.0 – 3.0% per °C, adjustable in increments of 0.1
LRR 1-51 only
Sin.L Lower end of measuring range, adjustable: 0 - 0.5 - 50 - 100 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 - 10000.0 - 12000 μS/cm
Sout Current output normalisation, adjustable between 1 and 9999 μS/cm
Si Flushing interval, adjustable between 0 and 24 hours in increments of 1h
Sd Flushing time, adjustable between 1 and 4 minutes in increments of 1min.
tESt Test Output relays are tested
Rotary knob with
integrated
pushbutton
MAX LED red
5432 7-segment display
LED 1 valve
opens
LED 2 valve
closes