Page 1
1
LRGT 16-1
LRGT 16-2
LRGT 17-1
Installation Instructions 818726-03
Conductivity Transmitter LRGT 16-1
Conductivity Transmitter LRGT 16-2
Conductivity Transmitter LRGT 17-1
GESTRA Steam Systems
EN
English
Page 2
2
Contents
Usage for the intended purpose ..............................................................................................................4
Safety Note .............................................................................................................................................4
Danger ...................................................................................................................................................4
ATEX (Atmosphère Explosible) .................................................................................................................4
Note on the Declaration of Conformity / Declaration by the Manufacturer
.......................................... 4
Important Notes
Page
Explanatory Notes
Scope of supply ...................................................................................................................................... 5
Description .............................................................................................................................................5
Function .................................................................................................................................................6
Installation notes ..................................................................................................................................15
Attention ............................................................................................................................................... 15
Note .....................................................................................................................................................15
Mounting conductivity transmitter .........................................................................................................15
Installation
Electrical Connection
Technical Data
LRGT 16-1, LRGT 16-2, LRGT 17-1 ..................................................................................................... 7, 8
Name plate / marking ............................................................................................................................. 9
Dimensions ...................................................................................................................................10 – 12
Key .......................................................................................................................................................14
Examples of installation .................................................................................................................. 16, 17
Key .......................................................................................................................................................17
Tools .....................................................................................................................................................17
Examples of Installation
LRGT 16-1, LRGT 16-2, LRGT 17-1 ....................................................................................................... 13
Key .......................................................................................................................................................14
Functional Elements
LRGT 16-1, LRGT 16-2, LRGT 17-1 ....................................................................................................... 18
Connecting the conductivity transmitter .......................................................................................... 18, 19
Key .......................................................................................................................................................10
Safety power supply unit for LRGT 16-1, LRGT 16-2, LRGT 17-1 ...........................................................20
Tools ....................................................................................................................................................20
Wiring diagram for conductivity transmitter LRGT 16-1, LRGT 17-1 ......................................................20
Wiring diagram for conductivity transmitter LRGT 16-2 .........................................................................21
Page 3
3
Contents – continued –
Page
Fault-finding list for troubleshooting ................................................................................................28, 29
Cleaning the measuring electrode .........................................................................................................29
Exchanging the electronic insert ...........................................................................................................30
Note .....................................................................................................................................................30
Malfunctions
Correcting the measured value .............................................................................................................26
Checking the temperature coefficient setting T
k
....................................................................................26
Adapting cell constant ..........................................................................................................................26
Functional test ......................................................................................................................................27
LEDs and malfunction indication ...........................................................................................................27
Operation
Danger .................................................................................................................................................31
Exchanging the conductivity transmitter ...............................................................................................31
Disposal................................................................................................................................................31
Decommissioning
Basic Settings
Factory setting .....................................................................................................................................22
Establishing measuring range and actual value output ................................................................... 22, 23
Checking temperature coefficient setting T
k
.......................................................................................... 24
Commissioning Procedure
Checking electrical connection .............................................................................................................25
Applying mains voltage .........................................................................................................................25
Note .....................................................................................................................................................25
Page 4
4
Important Notes
Safety note
Danger
When loosening the conductivity transmitter steam or hot water might escape. This
presents the danger of severe scalding. It is therefore essential not to remove the
conductivity transmitter unless the boiler pressure is verified to be 0 bar.
The conductivity transmitter becomes hot during operation. This presents the risk of
severe burns to hands arms when the equipment is touched.
Installation, de-installation and maintenance work should only be carried out when the
system is cold.
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified personnel who – through
adequate training – have achieved a recognised level of competence.
Usage for the intended purpose
Use conductivity transmitters LRGT 16-1, LRGT 16-2 and LRGT 17-1 only for measuring the electrical
conductivity in liquids.
When used for conductivity limiting or continuous boiler blowdown in steam boilers the conductivity
transmitters LRGT 16-1, LRGT 16-2 and LRGT 17-1 must only be used in conjunction with the industrial
controller KS 90-1.
To ensure trouble-free operation the requirements made on water quality according to TRD and EN
regulations must be met.
Use the equipment only within the specified pressure and temperature ratings.
Any type of use differing from the usage described above is considered as improper. The resulting risk
will have to be borne by the user alone. The manufacturer hereby expressly rejects any claims for any
resulting damage.
ATEX (Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in explosion risk areas.
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.de/documents or can be requested from us.
Page 5
5
Explanatory Notes
Scope of supply
LRGT 16-1
1 Conductivity transmitter LRGT 16-1
1 Joint ring 33 x 39, form D, DIN 7603, 1.4301, bright annealed
1 Installation manual
LRGT 16-2
1 Conductivity transmitter LRGT 16-2
1 Joint ring 33 x 39, form D, DIN 7603, 1.4301, bright annealed
1 Installation manual
LRGT 17-1
1 Conductivity transmitter LRGT 17-1
1 Joint ring 33 x 39, form D, DIN 7603, 1.4301, bright annealed
1 Installation manual
Description
The compact-design conductivity transmitter LRGT 16-1, LRGT 16-2, LRGT 17-1 consists of a
conduc tivity electrode, a temperature sensor for detecting the fluid temperature and a conductivity
transmitting unit incoporated in the terminal box.
The conductivity transmitters LRGT 16-1 and LRGT 17-1 work according to the conductometric
measuring method using two measuring electrodes and the conductivity transmitter LRGT 16-2 works
according to the conductometric measuring method using four measuring electrodes. The equipment
measures the conductivity of electrically conductive fluids (TDS content) and provides a 4-20 mA
measuring current as a function of the detected conductivity value.
The conductivity transmitters are designed for use with the industrial controller KS 90-1 for
conductivity limiting and continuous boiler blowdown in steam boilers or for conductivity monitoring
in condensate and feedwater systems.
The conductivity transmitters LRGT 16-1, LRGT 17-1 are mainly used in steam boilers with low TDS
content, e.g. steam regenerators, high-pressure boilers or condensate tanks.
The conductivity transmitter LRGT 16-1 is also approved for feedwater monitoring on strips.
The conductivity transmitter LRGT 16-2 is mainly used in industrial boiler plants operating with
pressures up to PN 40 and max. admissible conductivities acc. to TRD/EN of 8000/6000 μS/cm.
Page 6
6
LRGT 16-1, LRGT 17-1
A measuring current of variable frequency passes through the fluid, creating a potential gradient
between the measuring electrode and the reference tube which is then used as measuring voltage U
U
.
LRGT 16-2
The conductivity electrode consists of two current and two voltage electrodes. The current electrodes
direct the measuring current U
I
with a fixed frequency into the fluid, thereby creating a potential gradient between these electrodes. This potential difference is then picked up by the voltage
electrodes and evaluated as measuring voltage U
U
.
LRGT 16-1, LRGT 17-1 und LRGT 16-2
The electrical conductivity is a function of temperature. A resistance thermometer integrated in the
electrode measures the fluid temperatures so as to relate the measured values to the reference
temperature.
The electrical conductivity is calculated from the measuring voltages U
U
and UI and – as a function of
the adjusted temperature coefficient T
k
– linearly based on the reference temperature of 25 °C. Once
converted into a conductivity-dependent current signal, an output current of 4 – 20 mA is available for
external use.
The cables leading to the measuring electrode, the reference tube and the resistance thermometer
are monitored and checked for interruptions and short circuits. In addition, the circuit board is protected against excess temperatures in the terminal box. In the event of a malfunction, the LEDS on the
circuit board will light up or flash and the current signal is set to 0 or 0.5 mA. As a consequence the
controller KS 90-1 will signal sensor break.
A ten-pole code switch enables the parameterisation of the transmitter, the adaptation of the cell
constant and the activation of a performance test. The electrical conductivity is measured in μS/cm. In
some countries the unit ppm (parts per million) is used (conversion: 1 μS/cm = 0.5 ppm).
Explanatory Notes – continued –
Function
Page 7
7
LRGT 16-1, LRGT 16-2, LRGT 17-1
Technical Data
Type approval
TÜV.WÜL.xx-003
GL 33254-06 HH
Service pressure
LRGT 16-1: 32 bar at 238°C
LRGT 16-2: 32 bar at 238°C
LRGT 17-1: 60 bar at 275°C
Connection
Screwed 1" BSP (ISO 228-1)
Materials
Electrode screw-in body: 1.4571, X6CrNiMoTi17-12-2
Measuring electrode(s): 1.4571, X6CrNiMoTi17-12-2
Electrode insulation: PTFE
Terminal box: 3.2161 G AlSi8Cu3
LRGT 16-1, LRGT 17-1: measuring tube/screw: 1.4571, X6CrNiMoTi17-12-2
LRGT 16-1, LRGT 16-2: spacer disk: PEEK
LRGT 17-1: spacer disk: PEEK HT
Measuring length and length of installation (do not cut electrode tips!)
200, 300, 400, 500, 600, 800, 1000 mm (max. 400 mm for marine applications)
Temperature sensor
Resistance thermometer Pt 1000
Measuring cycle
1 sec.
Temperature compensation
Linear, T
k
adjustable via code switch
0 % per °C
1.6 – 3.0 % per °C in steps of 0.1
Time constant (measured according to two-bath process)
Temperature: 9 sec.
Conductivity: 14 sec.
Indicators and adjustors
Two LEDs for status messages
One 10-pole code switch for setting:
measuring range
temperature coefficient
cell constant
functional test
Voltage supply
24 V DC (18-36 V DC)
Power consumption
4.5 watt
Fuse
Electronic thermal fuse T
max
= 85 °C, hysteresis – 2 K
Page 8
8
Cable entry
EMC cable gland with integrated cable clamp, M 20 x 1.5
5-pole screw-type terminal strip, detachable, conductor size 1.5 mm²
Protection
IP 65 to EN 60529
Admissible ambient temperature
Max. 70 °C
Storage and transport temperature
–40 to +80 °C
Weight
Approx. 2.5 kg
Technical Data – continued –
LRGT 16-1, LRGT 16-2, LRGT 17-1 – continued –
LRGT 16-1, LRGT 17-1
Measuring range*) (µS/cm at 25 °C) Current output mA = µS/cm
4 mA
corresponds to
20 mA
corresponds to
100
3000
100
3000
5000 5000
7000 7000
10000 10000
Adjustable via code switch. Max. load for actual value output 750 ohm.
*) Conversion of μS/cm in ppm (part per million): 1 μS/cm = 0.5 ppm
LRGT 16-2
Measuring range*) (µS/cm at 25 °C) Current output mA = µS/cm
Preferred measuring range to 500 µS/cm
4 mA
corresponds to
20 mA
corresponds to
0.5
20
0.5
20
100 100
200 200
500 500
1000 1000
2000 2000
6000 6000
12000 12000
Page 9
9
Technical Data – continued –
Name plate / marking
Equipment designation
Fig. 1
Pressure rating, screwed
connection, material number
Application specifications
Electric rating
Measuring range
Specification of actual value output
CE marking
Manufacturer
Spare part specifications
Safety note
Disposal note
Page 10
10
1
Technical Data – continued –
Fig. 2 LRGT 16-1
E
A
L
Dimensions
E
[mm]
200
300
400
500
600
800
1000
b = 68
A.F. 41
∅ 28
∅ 40
1" to EN ISO 228-1
RA 12.5
RA 3.2
0.5
173
336
20
C
M
1" to EN ISO 228-1
N
Page 11
11
Technical Data – continued –
Fig. 3 LRGT 17-1
Dimensions – continued –
Cable gland
A
L
E
[mm]
200
300
400
500
600
800
1000
b = 68
A.F. 41
∅ 28
173
336
20
M
1" to EN ISO 228-1
E
N
∅ 40
1" to EN ISO 228-1
RA 12.5
RA 3.2
0.5
Page 12
12
E
Technical Data – continued –
Fig. 4 LRGT 16-2
Dimensions – continued –
E
[mm]
200
300
400
500
600
800
1000
A
C
E
L
∅ 40
1" to EN ISO 228-1
RA 12.5
RA 3.2
0.5
b = 68
A.F. 41
173
336
20
1" to EN ISO 228-1
∅ 28
Page 13
13
Functional Elements
Fig. 5
LRGT 16-1, LRGT 16-2, LRGT 17-1
B
G
F
I
H
J
321K
CD
Fig. 6 LRGT 16-1 (without cover plate)
Toggle switch white
Page 14
14
Technical Data / Functional Elements
1
LED 1, green
2 LED 2, red
3 Code switch
A Joint ring 33 x 39, form D, DIN 7603, 1.4301, bright annealed
B Cover screws (cross recess head screws M4)
C EMC cable gland M 20 x 1.5
D Housing cover
E Measuring length and length of installation
F Terminal strip
G Fixing screws for electronic circuit board
H Functional earth connection
I Seat ring
J Fixing nut for terminal box
K Terminal lugs for electrode lines, functional earth
L Thermal insulation
M Reference tube
N Set screw M 2.5 DIN 913
Key
Page 15
15
Installation
Attention
The seating surfaces and threads on the vessel and mounting flange must be
accurately machined.
Use only the supplied ring joint 33 x 39, form D, DIN 7603, 1.4301, bright annealed.
Do not insulate the threads with hemp or PTFE tape.
The conductivity transmitter can be installed horizontally or with a vertical inclination.
Be sure that the measuring surface is permanently submerged.
The specified torques must be strictly observed.
Do not lag the terminal box.
LRGT 16-1, LRGT 17-1
Provide a spacing of approx. 30 mm between the lower end of the reference tube and
the boiler wall, the smoke tubes and other metallic fittings as well as the low water
level (LW).
Do not cut the measuring electrode and the reference tube of the conductivity trans-
mitter.
LRGT 16-2
Provide a spacing of approx. 60 mm between the lower end of the reference tube and
the boiler wall, the smoke tubes and other metallic fittings as well as the low water
level (LW).
Do not cut the measuring electrode.
Avoid impacts and shocks to the electrode.
Note
For the approval of the boiler standpipe the relevant local and national regulations
must be observed.
Several examples of installation are shown on pages 17/18.
LRGT 16-1 (for marine applications)
Max. admissible length of measurement and installation: 400 mm.
When installed in steam boilers the conductivity transmitter must be secured against
unscrewing.
Installation notes
Mounting conductivity transmitter
1. Check seating surfaces of threads or mounting flange provided on vessel or boiler standpipe
(see Fig. 2, 3, 4). If necessary re-work the surfaces according to the specification indicated in the
drawing.
2. Place the supplied ring joint A onto the seating surface B of the conductivity transmitter.
3. Apply a light smear of silicone grease to the thread of the conductivity transmitter.
4. Screw conductivity transmitter into thread or flange provided on vessel or boiler standpipe and
tighten with an open-end spanner A. F. 41 mm. The torque required when cold is 150 Nm.
Page 16
16
Examples of Installation
GESTRASteamSystemsGESTRASteamSystems
GESTRA
LRGT....
GESTRA
LRGT
µS-ppm
NW
LW
NB
Fig. 7
Conductivity monitoring, direct installation of conductivity transmitter via lateral flanged connection
Conductivity monitoring and continuous blowdown control, direct installation of conductivity transmitter via measuring pot and connection of a continuous blowdown valve
Fig. 8
NW
LW
NB
A
GESTRASteamSystemsGESTRASteamSystems
GESTRA
LRGT....
GESTRA
LRGT
µS-ppm
LRGT 16-1
LRGT 16-2
LRGT 17-1
4
A
4 5 6 8 A
~ 250
415 336
1" BSP
EN ISO 228-1
R*
~ 250
600
336
1" BSP
EN ISO 228-1
R*
197
DN
[mm]A [mm]
15 182
20 184
25 184
40 189
R*: LRGT 16-1, LRGT 17-1 R = 30 mm
LRGT 16-2 R = 60 mm
LRGT 16-1
LRGT 16-2
LRGT 17-1
R*: LRGT 16-1, LRGT 17-1 R = 30 mm
LRGT 16-2 R = 60 mm
Page 17
17
Examples of Installation – continued –
A Ring joint 33 x 39, form D, DIN 7603, 1.4301, bright annealed
4 Boiler drum
5 Shut-off valve GAV
6 Continuous blowdown valve BAE
7 Measuring pot
8 T-type connector
Key
Fig. 9
Conductivity monitoring and continuous blowdown control, installation of conductivity transmitter in
blowdown line via separate measuring pot
M
GESTRASteam SystemsGESTRASteam Systems
GESTRA
LRGT....
GESTRA
LRGT
µS-ppm
6
5
1" BSP
EN ISO 228-1
DN 15-40
Outlet
Inlet
DN 15-40
7 A
Tools
Open-end spanner 18 (19) A. F.
Open-end spanner 41 A. F.
Screwdriver for hexagon-socket head screws, size 1.3
Screwdriver for cross-recess head screws, size 1 and 2
LRGT 16-1
LRGT 16-2
LRGT 17-1
Page 18
18
Electrical Connection
The terminal box is screwed to the electrode by means of a self-locking fixing nut.
Before establishing the electrical connection you can turn the terminal box by max. +/– 180 ° to the
desired position (cable outlet).
A flexible multi-core control cable, min. conductor size 0.75 mm
2
can be used for wiring.
LRGT 16-1, LRGT 16-2, LRGT 17-1
With the terminal box being open:
1. Undo cover screws B, remove cover D, Fig. 5
2. Detach terminal strip F from circuit board.
3. Unscrew the cap nut N of the cable gland C and take out the lamellar insert P, Fig. 10
4. Cut off outer sheath of the cable S and expose the braided screen Q over a length of approx.
10 – 15 mm.
5. Push cap nut N and lamellar insert P with sealing ring O onto the cable.
6. Bend braided screen Q outwards at a right angle (90°).
7. Fold braided screen Q towards outer sheath, i. e. by 180°.
8. Push lamellar insert P with sealing ring O into gland body R, turn it briefly around both sides of
the cable axis and snap anti-rotation element into place.
9. Firmly screw on cap nut N.
10. Connect the individual cables according to the wiring diagram to the terminal strip F.
11. Re-attach terminal strip F to circuit board.
12. Replace cover D and fasten the cover screws B.
Connecting the conductivity transmitter
Page 19
19
Connecting the conductivity transmitter – continued –
Electrical Connection – continued –
N Cap nut
O Sealing ring
P Lamellar insert
Q Braided screen
R Gland body
S Shielded cable
Key
Fig. 10
O
RNS
QP
Page 20
20
1 2
3 4 5
-
-
-
+
+
+
1 I
2 U
U
3
4
5
6
I
1
2
3
5
6
4
1ON2 3 4 5 6 7 8 9 10
To supply the conductivity transmitter with 24 V DC, a safety power supply unit (PSU), e.g. Siemens
SITOP power 05, must be used; this must provide a level of isolation against voltages hazardous to
touch that at least meets the requirements for double or reinforced insulation as per DIN EN 50178 or
DIN EN 61010-1 or DIN EN 60730-1 or DIN EN 60950 (electrically protective separation). The PSU must
be equipped with a protective device to DIN EN 61010-1.
Tools
Screwdriver for cross-recess head screws, size 1
Screwdriver for slotted head screws, size 2.5, completely insulated to VDE 0680-1
Open-end spanner 12 A. F.
Open-end spanner 18 (19) A. F.
Safety power supply unit for LRGT 16-1, LRGT 16-2, LRGT 17-1
Electrical Connection – continued –
Wiring diagram for conductivity transmitter LRGT 16-1, LRGT 17-1
Fig. 11
Terminal lug
Connecting point for
functional earth
Earth
Measuring
electrode
Toggle switch, white
4 - 20 mA
load, max.
750 Ω
24 V DC
Temperature
sensor
Pt 1000
Page 21
21
Electrical Connection – continued –
Wiring diagram for conductivity transmitter LRGT 16-2
Fig. 12
Terminal lug
Connecting point for
functional earth
Earth
Measuring
electrode
Toggle switch, white
4 - 20 mA
load, max.
750 Ω
24 V DC
Temperature
sensor
Pt 1000
Page 22
22
Basic Settings
Establishing measuring range and actual value output
Factory setting
The conductivity transmitter features the following factory set default values:
LRGT 16-1, LRGT 17-1
Measuring range: 0.5 µS/cm to 500 µS/cm (at 25°C) preferred measuring range
Temperature coefficient: 2.1 (% / °C)
LRGT 16-2
Measuring range: 100 µS/cm to 7000 µS/cm (at 25°C)
Temperature coefficient: 2.1 (% / °C)
To set the parameter of the conductivity transmitter, open the housing and use the 10-pole code switch
on the circuit board. The code switch can also be used for adapting the cell constant and initiating a
functional test. In the following tables, the factory settings are highlighted in grey.
1. Establish the measuring range (control range) of the conductivity transmitter on the basis of the
conductivity range of the steam boiler.
2. Set the desired measuring range via code switch. You can use a ball-point pen to set the code
switch.
When the supply voltage is applied (during commissioning) the first output will be 4 mA, then the output
current increases until it reaches the actual value.
Code switch
Measuring range
(µS/cm at 25 °C)
Current output mA = µS/cm
1 2 3
4 mA is
equivalent to
20 mA is
equivalent to
OFF OFF OFF
0.5
20
0.5
20
ON OFF OFF 100 100
OFF ON OFF 200 200
ON ON OFF
500 500
Factory setting
OFF OFF ON 1000 1000
ON OFF ON 2000 2000
OFF ON ON 6000 6000
ON ON ON 12000 12000
LRGT 16-1, LRGT 17-1
Page 23
23
Basic Settings – continued –
Establishing measuring range and actual value output – continued –
Code switch
Measuring range
(µS/cm at 25 °C)
Current output mA = µS/cm
1 2 3
4 mA is
equivalent to
20 mA is
equivalent to
OFF OFF OFF
100
3000
100
3000
ON OFF OFF 5000 5000
OFF ON OFF
7000 7000
Factory setting
ON ON OFF 10000 10000
ON ON ON 12000 12000
LRGT 16-2
When the supply voltage is applied (during commissioning) the first output will be 4 mA, then the output
current increases until it reaches the actual value.
Page 24
24
Basic Settings – continued –
Checking temperature coefficient setting T
k
For a linear compensation of the measured conductivity value based at 25 °C the temperature coefficient T
k
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, correct
the readings of the transmitter by adjusting a lower or higher temperature coefficient. Continue
modifying the T
k
setting step by step until the indicated conductivity value and measured comparison
value agree. Please wait 1 to 2 minutes after each step until the measured value has settled.
Code switch
Temperature coefficient
TK (% / °C)
4 5 6 7
OFF OFF OFF OFF 0 (no compensation)
ON OFF OFF OFF 1.6
OFF ON OFF OFF 1.7
ON ON OFF OFF 1.8
OFF OFF ON OFF 1.9
ON OFF ON OFF 2.0
OFF ON ON OFF
2.1
Factory setting
ON ON ON OFF 2.2
OFF OFF OFF ON 2.3
ON OFF OFF ON 2.4
OFF ON OFF ON 2.5
ON ON OFF ON 2.6
OFF OFF ON ON 2.7
ON OFF ON ON 2.8
OFF ON ON ON 2.9
ON ON ON ON 3.0
Page 25
25
Commissioning Procedure
1. Check that the conductivity transmitter is wired in accordance with the wiring diagram
(Fig. 11, 12, page 20, 21).
2. Make sure that the mains voltage is the same as indicated on the name plate.
Checking electrical connection
Apply mains voltage.
Applying mains voltage
Note
To remedy malfunctions that might occur during the commissioning procedure see
chapter “Systematic malfunction analysis” on page 28 – 29.
Page 26
26
If the indicated conductivity reading differs from the measured comparison value check and
re-adjust the temperature coefficient setting T
k
(see section “Settings” on page 24).
Only if the temperature coefficient setting is no longer sufficient for the correction should the cell
constant be modified.
If a modification is no longer possible remove the transmitter and clean the measuring surface.
Correcting the measured value
Operation
Checking the temperature coefficient setting T
k
For settings and procedure see page 24.
Adapting cell constant
The factory set cell constant 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.
Depending on the deviation set code switches 8 or 9 briefly to ON and then back to OFF. Wait for
approx. 1 – 2 minutes until the measured value has adjusted itself.
Repeat this procedure step by step until the indicated value matches the measured comparison
value.
If the conductivity transmitter and the controller are spatially separated the adaptation must be
made by a second person or by measuring the current in the transmitter.
If an adaptation is no longer possible remove the transmitter and clean the measuring surface
and/or the measuring electrodes.
Note
The default setting of the cell constant can be restored. For this purpose set code
switches 8 and 9 simultaneously to ON. After approx. 1 second set both switches back
to OFF. Repeat the procedure described in the paragraph above Adapting cell constant
until the conductivity reading matches the reference measured value.
Adapting cell constant – continued –
Deviation of the
indicated conductivity
Code switch LED indicator
8 9 Function green red
Non OFF OFF No change
Indicated value <
measured comparative value
ON OFF
Cell constant
increases
Rapidly
flashing
Indicated value >
measured comparative value
OFF ON
Cell constant
decreases
Rapidly
flashing
ON ON
Restores factory
setting
Both rapidly flashing
Page 27
27
Operation – continued –
Functional test
1. To check the functions of the conductivity transmitter set code switch 10 to ON in order to simulate a
value that exceeds the measuring range limit and to provide a current output of 20 mA.
2. After finishing the functional test set the code switch back to OFF.
Code switch 10 Functional test
OFF Normal operation
ON Simulation: measuring range limit exceeded
LEDs and malfunction indication
The two LEDs in the centre of the electronic insert indicate the status of the conductivity transmitter.
Normal operation Green LED Red LED Current output [mA]
Conductivity 0 to +10 %
of measured range
lit proportional to measured value
Conductivity 10 to +90 %
of measured range
lit lit proportional to measured value
Conductivity 90 to +100 %
of measured range
lit proportional to measured value
Flashing LEDs indicate a malfunction.
Malfunction Green LED Red LED Current output [mA]
Electrode lines interrupted or measuring surface /
measuring electrodes exposed
flashing 0
Value below 0 % setting flashing 4
Value above 100 %, e. g. measuring range too small flashing 20
Short circuit electrode lines flashing 0
Temperature in terminal box exceeds 85 °C flashing flashing 0
Lines to resistance thermometer interrupted or
short-circuited
flashing alternately 0.5
Page 28
28
Malfunctions
Fault-finding list for troubleshooting
Equipment is not working
Fault: No supply voltage.
Remedy: Apply power and check all electrical connections.
Fault: Electronic insert of the conductivity transmitter defective.
Remedy: Replace electronic insert.
Fault: Mass connection to vessel interrupted – no function.
Remedy: Clean seating surfaces and screw in electrode with metal joint ring 33 x 39, form D,
DIN 7603, made from 1.4301, bright annealed. Do not seal electrode with hemp or
PTFE tape.
Equipment signals malfunction
LED display: Red LED flashing.
Current output: 0 mA
Fault: Electrode lines interrupted or measuring surface / measuring electrodes exposed.
Remedy: Check connections of the electrode lines (electronic insert, terminal lugs 1 – 4).
Replace equipment if necessary. Check water level and installation.
LED display: Red LED flashing.
Current output: 4 mA
Fault: Value below 0 % setting, e.g. measuring surface / measuring electrodes exposed.
Remedy: Check water level and installation.
LED display: Green LED flashing.
Current output: 20 mA
Fault: Value above 100 % setting, e. g. measuring range too small.
Remedy: Set a larger measuring range.
LED display: Red LED flashing.
Current output: 0 mA
Fault: Short-circuited in electrode lines.
Remedy: Check connections of the electrode lines (electronic insert, terminal lugs 1 – 4).
Replace equipment if necessary.
LED display: Red and green LEDs are flashing.
Current output: 0 mA
Fault: Temperature in terminal box exceeds 85 °C.
Remedy: Check ambient temperature. Make sure it does not exceed 70°C.
Page 29
29
The equipment must only be installed and removed by qualified personnel. For more information see
section “Installation” on page 16.
To clean the measuring electrode take the conductivity transmitter out of service and de-install it.
LRGT 16-1, LRGT 17-1
To clean the measuring electrode take the conductivity transmitter out of service and de-install it.
Then undo the safety set screw N and unscrew the measuring tube M by hand.
LRGT 16-2
Clean the electrode rod and the measuring surface:
Use a fat-free cloth to wipe off loose deposits.
Use abrasive linen (medium grain size) to remove encrusted dirt deposits.
Malfunctions – continued –
Cleaning the measuring electrode
Fault-finding list for troubleshooting – continued –
LED display: Red and green LEDs are flashing alternately.
Current output: 0.5 mA
Fault: Electrical connections to resistance thermometer interrupted or short-circuited,
thermometer defective.
Remedy: Check thermometer connections (electronic insert, terminal lugs 5 – 6).
Replace equipment if necessary.
Inaccurate readings
Fault: Conductivity reading higher than comparison value.
Remedy: During commissioning: Reduce temperature coefficient T
k
.
During operation: Reduce cell constant.
Fault: Conductivity reading lower than comparison value.
Remedy: During commissioning: Increase temperature coefficient T
k
.
During operation: Increase cell constant.
Fault: The measurement result can no longer be adjusted by changing the cell constant.
Remedy: Remove conductivity transmitter and clean measuring surface / measuring electrodes.
Page 30
30
Malfunctions – continued –
1. Unscrew cover screws B and remove housing cover D.
2. Pull electrode wires from terminal lugs K on circuit board. Detach terminal strip F.
3. Undo the functional earth H connection.
4. Unscrew the fixing screws G for the electronic insert and take out the insert. The electronic insert is
available as spare part (type LRV 1-40) for LRGT 16-1, LRGT 17-1, type LRV 1-42 for LRGT 16-2.
5. Install the new electronic insert in reverse order.
Exchanging the electronic insert
Note
Please indicate the version and material numbers stated on the name plate when ordering
spare parts.
After replacing the electronic insert check the conductivity readings of the controller
KS 90-1 by carrying out a comparison measurement.
If you encounter any deviations, correct the cell constant of the conductivity transmitter.
If faults occur that are not listed in the fault-finding list or cannot be corrected,
please contact our Technical Services or authorized agency in your country.
Page 31
31
Decommissioning
Danger
Risk of severe burns and scalds all over the body.
Depressurise the vessel or measuring pot (0 bar) and make sure that it has cooled
down to room temperature (20 °C) before de-installing the conductivity transmitter.
Exchanging the conductivity transmitter
1. Switch off the voltage supply.
2. Unscrew cover screws B and remove the housing cover D.
3. Disconnect the connecting wires from the terminal strips F and pull wires out of the cable gland.
4. Remove the conductivity transmitter.
5. Install and connect the new conductivity transmitter.
6. Switch on voltage supply.
Disposal
Remove the conductivity transmitter and separate the waste materials in accordance with the material
specification.
Electronic components (boards) must be disposed of separately.
For the disposal of the conductivity transmitter observe the pertinent legal regulations concerning
waste disposal.
Page 32
32
818726-03/06-2011c
sa (808546-05) ·
GESTRA AG · Bremen · Printed in Germany
Agencies all over the world:
www.gestra.de
GESTRA AG
P. O. Box 10 54 60, D-28054 Bremen
Münchener Str. 77, D-28215 Bremen
Tel. 0049 (0) 421 35 03- 0
Fax 0049 (0) 421 35 03- 393
E-Mail gestra.ag@flowserve.com
Web www.gestra.de
GESTRA
Singapore
Flowserve Pte. Ltd.
12 Tuas Avenue 20
Singapore 63882
Tel. 0065 / 68 79 89 00
Fax 0065 / 68 62 49 40
E-Mail fcd_gestra_singapore@flowserve.com
Web www.gestra.com
Flowserve GB Limited
Abex Road
Newbury, Berkshire RG14 5EY
Tel. 0044 16 35 / 46 99 90
Fax 0044 16 35 / 3 60 34
E-mail gestraukinfo@flowserve.com
Web www.flowserve.com
Great Britain
USA
Flowserve GESTRA U.S.
2341 Ampere Drive
Louisville, KY 40299
Tel. 001 502 / 267-22 05
Fax 001 502 / 266-53 97
E-mail fcd-gestra-usa@flowserve.com
South Africa
Flowserve SA (Pty) Ltd.
Unit No. 1
Director Road
Spartan Extension 2
Kempton Park 1613
Tel. 0027 11 / 9 23 73 00
Fax 0027 11 / 9 74 64 20
E-Mail tvniekerk@flowserve.com
Web www.flowserve.com
Loading...