Installation Instructions 810701-00
Spector compact
Conductivity Transmitter System LRGT 16 - 1
IMPORTANT NOTES..........................................................................................................4
SAFETY NOTES ................................................................................................................. 4
Danger ...............................................................................................................................................................4
EXPLANATORY NOTES ....................................................................................................4
Scope of supply................................................................................................................................................4
System description ..........................................................................................................................................4
Function.............................................................................................................................................................5
INSTALLATION .................................................................................................................. 5
Measuring electrode.........................................................................................................................................5
Reduction of length of installation and measuring length (control range) ................................................6
ALIGNING, REMOVING AND MOUNTING OF TERMINAL BOX ...................................... 8
Align terminal box ............................................................................................................................................8
Remove terminal box .......................................................................................................................................8
Install terminal box...........................................................................................................................................8
WIRING ...............................................................................................................................9
Connecting conductivity transmitter..............................................................................................................9
Wiring diagram ...............................................................................................................................................10
COMPONENT PARTS ......................................................................................................16
COMMISSIONING PROCEDURE.....................................................................................12
Check wiring ...................................................................................................................................................12
Set code switch ..............................................................................................................................................12
Factory setting................................................................................................................................................12
Adjust measuring length (control range) and actual value output ...........................................................12
Check temperature coefficient Tk setting....................................................................................................12
Adjust cell constant .......................................................................................................................................13
Functional test ................................................................................................................................................13
LED display and fault indication...................................................................................................................14
2
TROUBLESHOOTING ...................................................................................................... 15
Fault finding list..............................................................................................................................................15
Changing electronic insert ............................................................................................................................16
TECHNICAL DATA...........................................................................................................16
DIMENSIONS OF LRGT 16-1 ........................................................................................... 19
APPLICATION AS CONDUCTIVITY LIMITER AND
CONTINUOUS BLOWDOWN CONTROLLER .................................................................20
INDUSTRIAL CONTROLLER KS 90 ................................................................................ 20
Component parts / front view........................................................................................................................20
Designs............................................................................................................................................................20
Wiring...............................................................................................................................................................21
Operating structure ........................................................................................................................................22
Configuration level .........................................................................................................................................22
Parameter level ...............................................................................................................................................25
Operating level................................................................................................................................................26
3
Important Notes
Safety Note
Use conductivity transmitter system LRGT 16-1 only for monitoring electrical conductivity
in liquids.
The equipment has to be supplied with 24 V DC from a safety power supply unit (PSU) in
accordance with DIN VDE 0106 (safe supply isolation). The PSU must be equipped with
an overcurrent protective device according to DIN EN 61010-1/VDE 0411.
The transmitter system LRGT 16-1 must only be installed by qualified staff.
Qualified staff are those persons who - through adequate training in electrical engineering,
the use and application of safety equipment in accordance with regulations concerning
electrical safety systems, and first aid & accident prevention have achieved a recognised
level of competence appropriate to the installation and commissioning of this critical safety
device.
Danger
When loosening the conductivity transmitter system steam or hot water might escape. This
presents the danger of scalding. It is therefore essential not to dismantle the conductivity
transmitter system unless the boiler pressure is verified to be zero.
Explanatory Notes
Scope of Supply
LRGT 16-1
1 Control electrode with joint ring D 33 x 39 DIN 7603-1.4301 E8P
1 Terminal box with conductivity transmitter
1 Installation manual
System Description
The LRGT 16-1 is a compact-design conductivity transmitter system consisting of a
conductivity electrode, a temperature sensor for detecting the fluid temperature and an
integrated conductivity transmitter. The equipment works according to the conductivity
measurement two-electrode control principle and provides a conductivity-dependent and
temperature compensated measuring current of 4 - 20 mA.
The conductivity transmitter system is designed to measure the electrical conductivity in
conductive fluids.
If the LRGT 16-1 is connected to the industrial controller type KS 90 the equipment can be
used as conductivity limiter and/or continuous blowdown controller in steam boilers,
(pressurised) hot-water boilers and condensate systems.
Type Approvals
TÜV WÜL · 01-003
EG BAF-MUC 01 04 105620 001
4
Function
A measuring current of variable frequency flows through the fluid and creates a potential
gradient between the measuring electrode and the measuring tube. The potential gradient
is evaluated as measuring voltage U
.
U
In order to compensate for polarisation, which would reduce the measuring current, the
measuring frequency is adapted accordingly. The resulting measuring current is sensed
and transmitted as measuring voltage U
.
I
The electrical conductivity changes as a function of temperature. The resistance
thermometer integrated in the electrode measures the fluid temperature and establishes a
reference temperature on which the measured values will be based.
The electrical conductivity is calculated from the measuring voltages UU and UI and depending on the adjusted temperature coefficient Tk - is based linearly on the reference
temperature 25 °C. After converting it into a conductivity-proportional current signal, a
current of 4 - 20 mA is provided for external processing.
The cables leading to the measuring electrode, the measuring tube and the resistance
thermometer are monitored for interruption and short circuits. In addition, the electronic
insert is protected against excessive temperatures in the terminal box. In case of a
malfunction the LEDs are permanently illuminated or flashing and the current signal is set
to 0 or 0.5 mA.
The transmitter is parameterised via code switch. The code switch can also be used for
adaptation of the cell constant and triggering a functional test.
The electrical conductivity is measured in µS/cm. In some countries use is also made of
ppm (parts per million). Conversion: 1 µS/cm = 0.5 ppm.
Installation
The conductivity transmitter system is designed such that it can be screwed directly into
boiler standpipes or suitably tapped flanges.
The electrode must be installed such that it is always submerged.
The installation in protection tubes is not permitted according to WÜ 100.
Ensure a minimum distance of approx. 20 mm between the lower part of the measuring
tube and the boiler wall, the smoke tubes, any other metal parts and the low water level
(LW).
Installation of the Measuring Electrode
1. Check seating surfaces of threads or flange provided on vessel or boiler standpipe.
2. Place ring joint onto the seating surface of the transmitter. Note: Use only ring joint (of
stainless steel 1.4301 E8P) D 33 x 39 to DIN 7603 supplied with the electrode.
3. Apply a light smear of silicone grease (e. g. DOW Corning 111 Compound) to electrode
thread.
4. Screw conductivity transmitter electrode into threads or flange provided on vessel or
boiler standpipe and tighten with a 41 mm open-end spanner. The torque required
when cold is 150 Nm. The tapped hole must conform to DIN 3852 part 2, 1" BSP (DIN
ISO 228) form X or Y, standard version. The subsequent hole must have a diameter of
> 24 mm.
5
Reducing length of installation and measuring length (control range)
The measuring tube and the electrode can be cut to suit the individual requirements of the
installation.
Length of installation A
[mm]
215 200
315 300 50
415 400 50
515 500 50
615 600 50
815 800 100
1015 1000 100
1. Carefully determine the required reduction of length - measured from the bottom end of
the measuring tube - and mark this on the measuring tube.
2. Only slacken locking grub screw using a screwdriver size 1.3 for socket-head cap
screws.
3. Unscrew measuring tube and cut it to the length marked.
4. Unscrew spacer disc.
5. Mark the reduction of length - measured from the extreme end of the tip - on the
electrode tip.
Measuring length L
[mm]
Possible reduction
of length R [mm]
6. Cut electrode tip to length. Cut back 10 - 12 mm of the insulation.
7. Screw back the spacer disc onto the electrode tip and fasten fingertight with a 12 mm
open end spanner.
8. Screw back measuring tube with a torque of 50 Nm and tighten locking grub screw.
Attention
! The seating surfaces and threads on the vessel and mounting flanges must be
accurately machined.
! Do not bend the electrode tip when cutting. Do not subject electrode to physical
shocks.
! Do not lag the electrode body.
! The conductivity transmitter system can be installed horizontally or with a vertical
inclination. The measuring surface must be permanently submerged.
Tools
! 41 mm open-end spanner
! 12 mm open-end spanner
! Screwdriver size 1.3 for socket-head cap screws
! Hacksaw
! Flat file, cut 2
6
Reducing length of installation and measuring length (control range)
7
Aligning, removing and mounting the terminal box
Align terminal box
1. Undo cover screws (cross-recess head screws M4)
and remove one terminal cover. The arrow on the
name plate points towards this cover.
2. Loosen fixing nut using 18 (19) mm open-end
spanner and turn terminal box into desired direction
(cable outlet).
3. Re-tighten fixing nut with a torque of 30 Nm.
4. Re-install cover, tighten cover screws, ensuring
correct seat of the cover gasket.
If required you can also remove the terminal box from
the electrode and re-install it afterwards.
Remove terminal box
1. Loosen cover screws (cross-recess head screws M4) and remove one terminal cover.
The arrow on the name plate points towards this cover.
2. Undo fixing screws for cover plate and remove plate.
3. Pull electrode cables from terminal lugs (electronic insert, functional earthing).
4. Loosen fixing nut with 18 (19) mm open-end spanner and remove it.
5. Pull electrode cables through fixing nut.
6. Remove terminal box. Pull all electrode cables through hole for fixing screw.
Install terminal box
1. Pull all electrode cables through hole for fixing screw in terminal box.
2. Place terminal box onto electrode and turn it into the desired direction, taking the cable
outlet into consideration. Ensure correct seat of the gasket between the electrode and
the terminal box.
3. Pull all electrode cables through fixing nut. Screw nut on fixing bolt and tighten with a
torque of 30 Nm.
4. Connect electrode cables according to wiring diagram to terminal lugs (electronic
insert, functional earthing).
5. Screw back cover plate. Install terminal cover and tighten cover screws, ensuring
correct seat of cover gasket.
8
Wiring
Connect conductivity transmitter
The equipment has to be supplied with 24 V DC from a safety power supply unit (PSU) in
accordance with DIN VDE 0106 (safe supply isolation). The PSU must be equipped with
an overcurrent protective device according to DIN EN 61010-1/VDE 0411.
The following steps 1 - 5 do not apply for equipment fitted with a connector.
For wiring use flexible screened control cable, min. conductor size 0.75 mm².
1. Remove terminal strip and pull connecting cable through cable gland.
2. Strip off approx. 40 mm of cable insulation coating and remove approx. 5 mm of
conductor end insulation.
3. Carry out wiring in accordance with wiring diagram.
4. Plug in terminal strip.
5. Seal cable entry by tightening cable glands. Use sealing plug to seal off cable glands
that are not used.
6. Install terminal cover and tighten cover screws, ensuring correct seat of cover gasket.
Tools
! Screwdriver size 1 for cross-recess head screws
! Screwdriver size 2.5 for slotted screws, completely insulated to VDE 0680
! 18 (19) mm open-end spanner
9
Wiring diagram
Version with terminal strip:
Connection of terminal lugs 1 - 6 (electrode cables)
1, 2
Measuring electrode
3, 4
Measuring tube (mass)
5, 6
Resistance thermometer
10
Functional elements
Representation without cover plate
11
Commissioning Procedure
Check wiring
1. Make sure that the conductivity transmitter system is wired in accordance with the
wiring diagram.
2. Check that the supply voltage corresponds to the name plate rating.
Set code switch
The transmitter is parameterised by means of a ten-pole code switch.
This code switch can also be used to adjust the cell constant and trigger off the functional
test.
The individual switch positions can be changed by using e. g. a ball pen.
Factory setting
S1 S2 S3 S4 S5 S6 S7 S8 S9 S10
ON ON ON OFF ON ON OFF OFF OFF OFF
In the following table the factory setting is highlighted in grey:
Adjust measuring length (control range) and actual value output
Code switch Control range
1 2 3
OFF OFF OFF 20 20
ON
OFF
ON ON
OFF OFF
ON
OFF
ON ON ON
OFF OFF 100 100
ON
OFF
ON ON
OFF 200 200
OFF 500 500
ON
ON
[µS/cm at 25 °C]
0.5
1000 1000
2000 2000
6000 6000
12000
4 mA correspond to 20 mA correspond to
Current output mA = µS/cm
0.5
12000
During the commissioning procedure (when the supply voltage is applied) the first output
will be 4 mA, then the output current increases until it reaches the actual value.
Check temperature coefficient Tk setting
For a linear compensation of the measured conductivity value based at 25 °C the
temperature coefficient Tk is set at our works to 2.1 % per °C. Once the service
temperature is reached you can check this setting by carrying out a comparison
measurement - e. g. as part of the commissioning procedure. If there is a deviation
between the indicated conductivity and the measured comparison value you can correct
the measurement result of the transmitter by adjusting a lower or higher temperature
coefficient. Continue modifying the Tk setting until the indicated conductivity value and
measured comparison value agree.
Code switch Temperature coefficient
Tk [%/°C]
4 5 6 7
OFF OFF OFF OFF 0 (no compensation)
ON
OFF
ON ON
OFF OFF OFF 1.6
ON
OFF OFF 1.7
OFF OFF 1.8
12
Code switch
4 5 6 7
OFF OFF
ON
OFF
ON ON ON
OFF OFF OFF
ON
OFF
ON ON
OFF OFF
ON
OFF
ON ON ON ON
OFF
ON ON
OFF OFF
ON
OFF
ON ON ON
ON
ON
OFF 1.9
OFF 2.0
OFF 2.1
OFF 2.2
ON
ON
OFF
OFF
ON ON
ON ON
ON
ON
Temperature coefficient
Tk [%/°C]
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
Adaptation of the cell constant
The cell constant adjusted at our factory is a characteristic geometric quantity of the
equipment and influences the calculation of conductivity. However, during operation this
constant can drift, e. g. due to dirt accumulated on the measuring electrode. If the
indicated conductivity value deviates from the measured comparative value you can
correct the measurement result of the transmitter by re-adjusting the cell constant.
Depending on the deviation set code switches 8 or 9 to ON, the cell constant will then
change continuously. Observe the conductivity indication and when the indicated value
agrees with the comparison measurement set the switch back to OFF. Should an
adjustment not be possible remove the transmitter and clean the measuring surface.
To restore the factory setting of the cell constant - e. g. after cleaning the measuring
surface - set code switches 8 and 9 simultaneously to ON. After approx. 1 sec. switch back
to OFF. The factory setting is restored.
Code switch
Deviation of the indicated
8 9 Function
conductivity
non OFF OFF No change
Indicated value < Measured comparative
value
Indicated value > Measured comparative
value
ON
OFF
ON ON
OFF Cell constant increases
ON
Cell constant decreases
Restores factory setting
Functional Test
Use code switch 10 for performing a functional test. A value is simulated which exceeds
the final control range value and a current output of 20 mA is provided.
Code switch Functional test
10
OFF Normal operation
ON
Simulation
Final control range value
exceeded
When the functional test is finished set code switch back to OFF.
13
LED Display and Fault Indications
A green and a red LED for status and fault indication are provided in the centre of the
electronic insert.
Normal operation green LED red LED
Conductivity 0 to +10 %
of control range
Conductivity 90 to 100 %
of control range
Conductivity 10 to 90 %
of control range
lit proportional to
lit proportional to
lit lit proportional to
Fault green LED red LED
Value below 0 % setting,
e. g. electrode exposed
Connections to measuring
tube/electrode interrupted
Value above 100 % setting,
e. g. control range too small
Connections to measuring
tube/electrode shortcircuited
Temperature in terminal box
exceeds 85 °C
Connection to resistance
thermometer interrupted or
short-circuited
flashes 4 mA
flashes 0 mA
flashes 0 mA
flashes 0 mA
flashes flashes 0 mA
flash alternately 0.5 mA
Current output [mA]
measured value
measured value
measured value
Current output [mA]
14
Troubleshooting
Fault Finding List
Equipment does not work
Fault: Supply voltage failure - no function.
Remedy: Check power supply and all electrical connections.
Fault: Electronic insert defective.
Remedy: Replace electronic insert.
Equipment signals malfunction
LED display: Red LED flashing.
Current output: 4 mA
Fault: Value below 0 % setting, e. g. electrode exposed.
Remedy: Check water level and installation.
LED display: Red LED flashing.
Current output: 0 mA
Fault: Connection to measuring tube/electrode interrupted.
Remedy: Check electrode cables (electronic insert, terminal lugs 1 - 4).
Replace equipment if necessary.
LED display: Green LED flashing.
Current output: 0 mA
Fault: Value above 100 % setting, e. g. control range too small.
Remedy: Adjust larger control range.
LED display: Red LED flashing.
Current output: 0 mA
Fault: Connections to measuring tube/electrode short-circuited.
Remedy: Check electrode cables (electronic insert, terminal lugs 1 - 4).
Replace equipment if necessary.
LED display: Red and green LEDs flash alternately.
Current output: 0 mA
Fault: Temperature in terminal box exceeds 85 °C.
Remedy: Check ambient temperature. Make sure it does not exceed 70 °C.
LED display: Red and green LEDs flash alternately.
Current output: 0.5 mA
Fault: Electrical connections to resistance thermometer interrupted or
short-circuited or thermometer defective.
Remedy: Check thermometer connections (electronic insert, terminal lugs 5 + 6).
Replace equipment if necessary.
15
Inaccurate readings
Fault: Indicated conductivity higher than measured comparison value.
Remedy: During commissioning: Reduce temperature coefficient Tk.
During operation: Reduce cell constant.
Fault: Indicated conductivity lower than measured comparison value.
Remedy: During commissioning: Increase temperature coefficient Tk.
During operation: Increase cell constant.
Fault: The measurement result can no longer be adjusted by changing
the cell constant.
Remedy: Remove equipment and clean measuring surface.
Exchanging electronic insert
1. Undo lid screws and remove both housing lids.
2. Unscrew fixing screws of cover plate and remove the plate.
3. Pull electrode wires from terminal lugs on circuit board. Plug out the lower terminal
strip.
4. Undo fixing screws of electronic insert and remove insert. The electronic insert is
available as spare part (type LRV 1-40).
When ordering please state the version (VS) and material number indicated on
the name plate.
5. Install the new electronic insert in reverse order.
Tools
! Screwdriver size 1 for cross-recess head screws.
! Screwdriver size 2.5 for slotted screws, completely insulated to VDE 0680
Technical data
Type code
Type L R G T 1 6 - 1
Conductivity measurement
Closed-loop control
Sensor
Transmitter
Type of measurement (conductimetry = 1)
Pressure rating, PN 40 = 6
Design series
Service pressure
32 bar at 238 °C
16
Connection
1" BSP to DIN ISO 228
Materials
Screwed housing: 1.4571
Measuring tube/electrode/screw: 1.4571
Electrode rod insulation: PTFE
Spacer disc: PEEK
Terminal box: 3.2161 aluminium
Length of installation / Measuring length / Reduction of length
Length of installation A
[mm]
Measuring length L
[mm]
215 200
315 300 50
415 400 50
515 500 50
615 600 50
815 800 100
1015 1000 100
Temperature sensor
Resistance thermometer Pt 1000
Possible reduction of
length R [mm]
Cell constant C
0.2 cm
-1
Wiring
5pole screw-type terminal strip, removable, conductor size 1.5 mm² or via 5pole connector
Cable entry
Cable gland with integral cable clamp, 1 x PG 9 (M16), 1 x PG 16 (M20)
Protection
IP 65 to DIN 40050
Max. admissible ambient temperature
70 °C
Temperature for storage and transport
– 40 to + 80 °C
Supply voltage
24 V DC (18 - 36 V DC)
17
Power consumption
3 W
Fuse
Electronic thermal fuse T
85 °C, hysteresis – 2 °C
max
Conductivity control range / Actual value output
Control range*)
[µS/cm at 25 °C]
0.5
20 20
4 mA corresponds to 20 mA corresponds to
0.5
Current output
mA = µS/cm
100 100
200 200
500 500
1000 1000
2000 2000
6000 6000
12000
12000
Adjustable via code switch. Max. load for actual value output 750 Ω.
*) Conversion µS/cm into ppm (parts per million)
1 µS/cm = 0.5 ppm
Measurement cycle
1 sec.
Accuracy
5 %, referred to measured conductivity without temperature compensation
Temperature compensation
linear, Tk adjustable via code switch, 0 %/°C, 1.6 - 3.0 %/°C in steps of 0.1 %/°C
Time constant T (measured acc. to DIN 3440)
Temperature: 9 sec.
Conductivity: 14 sec.
18
Dimensions of Conductivity Transmitter System LRGT 16-1
19
Application as conductivity transmitter and continuous blowdown controller
Use conductivity transmitter system for conductivity limiting (TDS and continuous
blowdown control) in steam boilers only in conjunction with industrial controller KS 90.
The following describes the configuration and adjustment of the controller KS 90 when
used for conductivity (TDS) limiting and continuous boiler blowdown control.
Note:
The installation manual for the industrial controller KS 90 supplied with the equipment
must also be taken into consideration!
Industrial Controller KS 90
Functional elements / Front view
Yellow LED C lit: Continuous blowdown valve opens
Yellow LED H lit: Continuous blowdown valve closes
Green LED AL 1 lit: Max. limit exceeded
Versions
The following versions can be used:
Supply voltage
230/115 V AC
24 V AC
9404 410 3 2 0 0 1 or 9404 410 5 2 0 0 1
20
Wiring
Keep mains cables separate from signal and measuring cables. We recommend twisted
and screened measuring cables (screen connected to earth).
Connected final elements must be equipped with protective circuits to manufacturer
specification. This avoids voltage peaks which can cause trouble to the
controller.
The instruments must be protected by an individual or common fuse for a max. power
consumption of 10 VA per unit (standard fuse ratings, min. 1.0 A).
Signal and measurement circuits may carry max. 50 V r.m.s. against ground, mains
circuits may carry max. 250 V r.m.s. between terminals.
Output 1: Continuous blowdown valve closes, relay contact closed
Output 2: Continuous blowdown valve opens, relay contact closed
Output 3: Max. limit exceeded, relay contact open
21
Operating Structure
After switching on mains (1), the controller is initialised (Test, Con1, Con2), then turns into
the #OPERATING LEVEL 1 and controls the process. The controller is
matched to the control task at the # PARAMETER LEVEL 2 and to the process at
the #CONFIGURATION LEVEL 3. The level transfer is done with the key . To exit the
operating level, S.I.L. switch LOCK must be open (factory setting). Exit from the parameter
level is via timeout (30 s), too. After keying completely through the configuration level,
transfer is into operating level (2 configuration not changed) or into initialisation
(3 configuration has been changed).
Configuration Level
Adjustment:
Type of input:
4 - 20 mA, Inl /InH adjustable
Controller function:
Three-position stepping controller
Function of the outputs:
Relay 1: valve CLOSED
Relay 2: valve OPEN
Relay 3: Alarm 1
3 1 7 2
22
Controller Functions
Adjustment: 2 8 0 0
Alarm 1:
Sensor alarm + limit contact
Absolute limit contact
Adjustment:
Sensor alarm reaction
as X < W, i. e. valve closes
0 0 0 1
23
Adjustment:
0 0 0 0
24
Parameter Level
No.
Parameter name Symbol Adjustment range
01 Set-point
02 Segment time
03 Limit contact 1 low
04 Limit contact 1 high
05 Alarm switch. differential for
LC 1
06 Operation locking
07 Lower set-point limit
08 Upper set-point limit
09 Proportional band
SP 2
Between lower and upper set point limit
( SPL .....SPH )
P t 2
L C L 1
0….9999 min, adjustment 10
Lower set-point limit SPL.....9999
L C H 1 - - - -
S d A 1
L o c
S P L
1....9999, adjustment 1
0
Start of control range ( InL )...
Upper set-point limit ( SPH – 1 )
S P H
Lower set-point limit ( SPL + 1 )...
End of control range ( InH )
P b 1
0.1....999.9 %, adjustment 10 %
10 Integral time
11 Derivative time
12 Actuator response time
13 Min. step time
14 Trigger point separation
15 Filter time constant
16 Decimal point
17 Start of control range
18 End of control range
t i
t d
t t
t t p
S H
t F
d P
I n L
I n H
0
0
depend. on actuator, e. g. 120 s
0.1....2.0 s, adjustment 2.0 s
0.2....20.0 %, adjustment e. g. 10 %
0.0....999.9 s, adjustment e. g. 1.0 s
0 / 1 / 2 (0 = no decimal point)
- 999....( InH –1 )
( InL +1 )....9999
25
The displayed parameter values of SP 2, LCL, LCH, SdA 1, SPL, SPH, InL and InH
depend on the decimal point.
Specifications in % refer to the span I n L .... I n H.
First calibrate start and end of the control range (InL, InH) and then the upper and lower
set-point limits (SPL, SPH).
Conductivity
transmitter
Control range*
[µS/cm at 25 °C]
0.5
If the equipment is used for conductivity limiting purposes set the limit contact low
(LCL1) to the predefined max. electrical conductivity value. When this limit is exceeded the
green LED for Alarm 1 lights up and relay output 3 opens the burner protection circuit. The
adjusted limit value can be retrieved at any time on the parameter level. Relay output 3
does not interlock automatically. The interlocking function must hence be implemented in
the follow-up circuit (burner protection circuit), which has to comply with the requirements
of DIN VDE 0116.
20 20.0
100 100.0
200 200.0
500 500.0
1000 1000
2000 2000
6000 6000
12000
I n L
S P L
0.5
Controller
I n H
S P H
9999
Operating Level
This level is for process control. Actual (process) value X and set-point W are displayed in
manual and automatic modes. Manipulated variable Y is displayed by means of selector
key. Manual and automatic modes are switched with Hand/automatic key.
26
The set-point in manual mode or set-point and/or manipulated variable in automatic mode
can be changed by means of arrow keys. The change is effective after 2 s or by pressing
selector key briefly. For manual operation of the continuous blowdown valve first switch to
manual operation using the selector key and then switch to manipulated variable Y. Now it
is possible to use the arrow keys for manual adjustments.
If the measuring current coming from the conductivity transmitter falls below 2 mA or the
line has the wrong polarity the following error message will appear:
With this error message the continuous blowdown valve will be closed.
27
810701-00/602c
28
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