Burkert 8225 Instruction Manual

E-1- Ref. 425552
CONDUCTIVITY 8225
Fluid Control Systems
TABLE OF CONTENTS
1INTRODUCTION ............................................................................................... E-2
1.1 Unpacking and Control ...................................................................................... E-2
1.2 About this Manual .............................................................................................. E-2
1.3 User's Responsibility for Safety ........................................................................ E-2
1.4 Electromagnetic compatibility ............................................................................ E-2
2SPECIFICATION ............................................................................................... E-3
2.1 Type Specification ............................................................................................. E-3
2.2 Design and Measuring Principle ....................................................................... E-5
2.3 Dimensions ........................................................................................................ E-6
2.4 Technical Data ................................................................................................... E-7
2.5 Measuring range electrodes .............................................................................. E-8
3INSTALLATION ................................................................................................ E-9
3.1 Installation Guidelines ....................................................................................... E-9
3.2 Installation.......................................................................................................... E-9
3.3 General Electrical Connection......................................................................... E-10
3.4 Electrical Wiring ............................................................................................... E-10
3.4.1 8225 without relays ................................................................................ E-10
3.4.2 8225 with Relays .................................................................................... E-12
3.4.2 8225 with 230/115 VAC Power Supply .................................................. E-13
4OPERATING ................................................................................................... E-14
4.1 Operating and Control Elements ..................................................................... E-14
4.2 Operation Mode Display .................................................................................. E-15
4.3 Calibration Mode Display ................................................................................ E-16
4.3.1 Languages .............................................................................................. E-16
4.3.2 Engineering Units ................................................................................... E-17
4.3.3 Cell Constant .......................................................................................... E-17
4.3.4 Temperature Compensation Coefficient ................................................ E-17
4.3.5 Output Current ........................................................................................ E-19
4.3.6 Relay....................................................................................................... E-19
4.3.7 Filter Function ......................................................................................... E-21
4.4 Test Menu ........................................................................................................ E-21
4.4.1 Offset-Compensation ............................................................................. E-21
4.4.2 Span-Compensation............................................................................... E-22
4.4.3 Display of non-compensated Conductivity............................................. E-22
4.4.4 Conductivity Simulation .......................................................................... E-22
5 MAINTENANCE .............................................................................................. E-23
5.1 Storing and Cleaning of the Electrode ............................................................ E-23
5.2 Trouble-shooting Guide ................................................................................... E-23
5.3 Factory Settings of the 8225 ........................................................................... E-23
5.4 Spare Parts List ............................................................................................... E-24
APPENDIX ........................................................................................................ G-1
Examples of connections for transmitter 8225.................................................. G-1

E-2-
CONDUCTIVITY 8225
Fluid Control Systems
1 INTRODUCTION
Dear Customer,
Congratulations on your purchase of our
8225 digital conductivity transmitter.
BEFORE INSTALLING OR USING THIS
PRODUCT, PLEASE TAKE OUR ADVICE
AND READ THE ENTIRE MANUAL
THOROUGHLY.
This will enable you to benefit fully from all
of the advantages which the product can
offer.
1.1 Unpacking and Control
Please verify that the product is complete
andfreefromanydamage andthat youhave
recieved the following as a standard
delivery:
-18225Digital ConductivityTransmitter
-1 Operating Instruction Manual
To ensure that you have recieved the
product required, please compare the Type
specification(Bürkertidentification number)
on the label to the lists on the following
pages. If there are any problems such as
loss or damage, please contact your local
Bürkert subsidiary.
1.2 About this Manual
This manual does not contain any form of
warranty or statement and full referal to our
general terms of sale and delivery should
be noted.
This product should only be installed and/or
repaired by correctly trained staff. If any
difficultiesmayoccur withthe productduring
installation,pleasedo nothesitate tocontact
your nearest Bürkert sales office for
assistance.
1.3 User's Responsibility for Safety
Bürkert manufactures a broad range of
conductivity transmitters designed to
operate in a wide variety of applications. It
is the customer's responsibility to select an
appropriate transmitter for the application,
ensure the unit is installed correctly, and
maintain all components. Special attention
must be made to the chemical resistance of
the transmitter and the fluids/medium which
maybe in direct contact with the product.
Ifthissymbol appears,it indicates
that special attention should be
made to the instructions, as they
may affect the safe installation, function or/
and use of the product.
1.4 Electromagnetic compatibility
This device conforms to the EMC-Directive
of the European Union 89/336/EEC.
In order to comply with the above directive,
the wiring instructions must be followed as
instructed.
!

E-3-
CONDUCTIVITY 8225
Fluid Control Systems
2 SPECIFICATION
2.1 Type Specification
2.1.2 Transmitter 8225 with 12-30 VDC power supply
Conductivity transmitter Gasket Sensor Cable entry Ident N°
STANDARD TYPES WORLWIDE
8225 with 4-20 mA FPM K=0,01 DIN 43650 PG9 418950
8225 with 4-20 mA FPM K=0,1 DIN 43650 PG9 418951
8225 with 4-20 mA FPM K=1,0 DIN 43650 PG9 418952
8225 with 4-20 mA FPM K=10 DIN 43650 PG9 418953
8225 with 4-20 mA, 2 Relays FPM K=0,01 2xPG 13,5 418954
8225 with 4-20 mA, 2 Relays FPM K=0,1 2xPG 13,5 418955
8225 with 4-20 mA, 2 Relays FPM K=1,0 2xPG 13,5 418956
8225 with 4-20 mA, 2 Relays FPM K=10 2xPG 13,5 418957
STANDARD TYPES WORLWIDE WITHOUT RELAYS
8225 with 4-20 mA EPDM K=0,01 DIN 43650 PG9 418958
8225 with 4-20 mA EPDM K=0,1 DIN 43650 PG9 418959
8225 with 4-20 mA EPDM K=1,0 DIN 43650 PG9 418960
8225 with 4-20 mA EPDM K=10 DIN 43650 PG9 418961
8225 with 4-20 mA FPM K=0,01 PG 13,5 418962
8225 with 4-20 mA FPM K=0,1 PG 13,5 418963
8225 with 4-20 mA FPM K=1,0 PG 13,5 418964
8225 with 4-20 mA FPM K=10 PG 13,5 418965
8225 with 4-20 mA EPDM K=0,01 PG 13,5 418966
8225 with 4-20 mA EPDM K=0,1 PG 13,5 418967
8225 with 4-20 mA EPDM K=1,0 PG 13,5 418968
8225 with 4-20 mA EPDM K=10 PG 13,5 418969
STANDARD TYPES WORLWIDE WITH RELAYS
8225 with 4-20 mA, 2 Relays EPDM K=0,01 2xPG 13,5 418970
8225 with 4-20 mA, 2 Relays EPDM K=0,1 2xPG 13,5 418971
8225 with 4-20 mA, 2 Relays EPDM K=1,0 2xPG 13,5 418972
8225 with 4-20 mA, 2 Relays EPDM K=10 2xPG 13,5 418973
STANDARD TYPES NORTH AMERICA
8225 with 4-20 mA FPM K=0,01 DIN 43650 G 1/2" 418974
8225 with 4-20 mA FPM K=0,1 DIN 43650 G 1/2" 418975
8225 with 4-20 mA FPM K=1,0 DIN 43650 G 1/2" 418976
8225 with 4-20 mA FPM K=10 DIN 43650 G 1/2" 418977
8225 with 4-20 mA, 2 Relays FPM K=0,01 2xG 1/2" 418978
8225 with 4-20 mA, 2 Relays FPM K=0,1 2xG 1/2" 418979
8225 with 4-20 mA, 2 Relays FPM K=1,0 2xG 1/2" 418980
8225 with 4-20 mA, 2 Relays FPM K=10 2xG 1/2" 418981
STANDARD TYPES NORTH AMERICA WITHOUT RELAYS
8225 with 4-20 mA EPDM K=0,01 DIN 43650 G 1/2" 418982
8225 with 4-20 mA EPDM K=0,1 DIN 43650 G 1/2" 418983
8225 with 4-20 mA EPDM K=1,0 DIN 43650 G 1/2" 418984
8225 with 4-20 mA EPDM K=10 DIN 43650 G 1/2" 418985
STANDARD TYPES NORTH AMERICA WITH RELAYS
8225 with 4-20 mA, 2 Relays EPDM K=0,01 2xG 1/2" 418986
8225 with 4-20 mA, 2 Relays EPDM K=0,1 2xG 1/2" 418987
8225 with 4-20 mA, 2 Relays EPDM K=1,0 2xG 1/2" 418988
8225 with 4-20 mA, 2 Relays EPDM K=10 2xG 1/2" 418989

E-4-
CONDUCTIVITY 8225
Fluid Control Systems
Conductivity transwithter Gasket Sensor Cable entry Ident N°
STANDARD TYPES WORLWIDE
8225 with 4-20 mA FPM K=0,01 2XPG 13,5 426935
8225 with 4-20 mA FPM K=0,1 2XPG 13,5 426936
8225 with 4-20 mA FPM K=1,0 2XPG 13,5 426937
8225 with 4-20 mA FPM K=10 2XPG 13,5 426938
8225 with 4-20 mA EPDM K=0,01 2XPG 13,5 426939
8225 with 4-20 mA EPDM K=0,1 2XPG 13,5 426940
8225 with 4-20 mA EPDM K=1,0 2XPG 13,5 426941
8225 with 4-20 mA EPDM K=10 2XPG 13,5 426942
STANDARD TYPES WORLWIDE WITH RELAYS
8225 with 4-20 mA, 2 Relays FPM K=0,01 2xPG 13,5 426943
8225 with 4-20 mA, 2 Relays FPM K=0,1 2xPG 13,5 426944
8225 with 4-20 mA, 2 Relays FPM K=1,0 2xPG 13,5 426945
8225 with 4-20 mA, 2 Relays FPM K=10 2xPG 13,5 426946
8225 with 4-20 mA, 2 Relays EPDM K=0,01 2xPG 13,5 426947
8225 with 4-20 mA, 2 Relays EPDM K=0,1 2xPG 13,5 426948
8225 with 4-20 mA, 2 Relays EPDM K=1,0 2xPG 13,5 426949
8225 with 4-20 mA, 2 Relays EPDM K=10 2xPG 13,5 426950
STANDARD TYPES NORTH AMERICA
8225 with 4-20 mA FPM K=0,01 2xG 1/2" 426951
8225 with 4-20 mA FPM K=0,1 2xG 1/2" 427864
8225 with 4-20 mA FPM K=1,0 2xG 1/2" 427865
8225 with 4-20 mA FPM K=10 2xG 1/2" 427866
8225 with 4-20 mA EPDM K=0,01 2xG 1/2" 427867
8225 with 4-20 mA EPDM K=0,1 2xG 1/2" 427868
8225 with 4-20 mA EPDM K=1,0 2xG 1/2" 427869
8225 with 4-20 mA EPDM K=10 2xG 1/2" 427870
STANDARD TYPES NORTH AMERICA WITH RELAYS
8225 with 4-20 mA, 2 Relays FPM K=0,01 2xG 1/2" 427871
8225 with 4-20 mA, 2 Relays FPM K=0,1 2xG 1/2" 427872
8225 with 4-20 mA, 2 Relays FPM K=1,0 2xG 1/2" 427983
8225 with 4-20 mA, 2 Relays FPM K=10 2xG 1/2" 427984
8225 with 4-20 mA, 2 Relays EPDM K=0,01 2xG 1/2" 427985
8225 with 4-20 mA, 2 Relays EPDM K=0,1 2xG 1/2" 427986
8225 with 4-20 mA, 2 Relays EPDM K=1,0 2xG 1/2" 427987
8225 with 4-20 mA, 2 Relays EPDM K=10 2xG 1/2" 427988
2 SPECIFICATION
2.1.2 Transmitter 8225 with 115/230 VAC power supply

E-5-
CONDUCTIVITY 8225
Fluid Control Systems
2 SPECIFICATION
Measuring Principle
Conductivity is defined as the ability of a
solution to conduct electrical current. The
load carriers are ions (e.g. dissolved salts
or acids). In order to measure the
conductivity, 2 electrodes are used which
are set at a fixed distance apart and with a
known specified surface. An AC voltage
source is connected to the electrodes. The
measured current is a direct function of the
conductivity of the solution.
Thetransducerwithout relaysfunctionshas
a 2-wire circuit and requires a power supply
of 12-30 VDC. The device is available with
anintegratedpower supply of 115/230 VAC.
A standard output signal of 4-20 mA is
available, although it is proportional to the
conductivity.
The transducer with 2 additional relays has
a 3-wire circuit. Limit values are freely
adjustable.
2.2 Design and Measuring Principle
Design
The compact conductivity transmitter
combines a sensor and a transducer with
display in a splash-proof plastic IP65
enclosure.
The sensor component consists of easily
replaceable sensors. Sensors with cell
constants of 0.01 and 0.1 are fitted with
stainless steel electrodes, and those with a
higher cell constant 1.0 and 10 are fitted
with graphite electrodes. The Pt1000 for
automatic temperature compensation is a
standard feature in all sensor housings.
The transducer component converts the
measured signal and displays the actual
value.
The output signal is provided within a 4-
pole plug according to DIN 43 650 or via
one PG 13.5 (version without relays) or via
2 PG 13.5 (version with relays).

E-6-
CONDUCTIVITY 8225
Fluid Control Systems
2.3 Dimensions
2 SPECIFICATION
1/2" G
Version:
"WORLDWIDE"
See part 2.1
1/2" G
Version:
"NORTH AMERICA"
See part 2.1

E-7-
CONDUCTIVITY 8225
Fluid Control Systems
2 SPECIFICATION
2.4 Technical Data
Pressure class PN 6
Fluid temperature 0 to 100 °C (32 to 212 °F) (*)
Ambient temperature 0 to 60 °C (32 to 140 °F)
Storing temperature 0 to 60 °C (32 to 140 °F)
Relative humidity max. 80 %
Enclosure IP 65
Measuring range 0,05 µS/cm...200 mS/cm, depending on cell constant
Measuring error typical: 3 % of measured value
max.: 5 % of measured value
Temperature compensation automatic with standardized integrated Pt1000 with
reference temperature of 25 °C (77 °F)
Supply Voltage 12-30 VDC or 115/230 VAC
Output signal 4-20 mA
Load max. 700 Ohm at 30 V
max. 400 Ohm at 24 V
max. 100 Ohm at 15 V
Display 15 x 60 mm LCD 8 digits, alphanumeric,
15 segments, 9 mm high
Relay output (optional) 2 relays, 3 A, 230 V, freely adjustable
Sensor housing PVDF
O-rings FPM/EPDM
Electronic housing PC
Front plate polyester
Measuring electrodes K=0.01 stainless steel electrodes
K=0.1 stainless steel electrodes
K=1.0 graphite electrodes
K=10 graphite electrodes
(*) Refer to fittings instruction manual.

E-8-
CONDUCTIVITY 8225
Fluid Control Systems
2 SPECIFICATION
2.5 Measuring range of electrodes
K = 0.1 und K = 0.01 K = 10K = 1.0
The conductivity transmitter can be fitted
with4differentelectrodeswith cell constants
0.01; 0.1; 1.0 and 10. The electrode is
selected according to the measuring range
and medium by using the table below.
µS/cm mS/cm
0.02 0.05
0.1
0.2 0.5
1
25
10
20 50
100
200 50025
10
20 50
100
200 500
K=0.01
K=0.1
K=1.0
K=10
MΩ.cm KΩ.cm
50 20
10
52
1
0.5 0.2
0.1
0.05 0.02
0.01
0.0020.005
1
0.5 0.2
0.1
0.05 0.02
0.01
0.0020.005
pure water industrial water concentrated solutions
Fig. 2.1 Measuring ranges of electrodes
sewage
water
ultra-
pure
water

E-9-
CONDUCTIVITY 8225
Fluid Control Systems
-50 -30 -10 +10 +30 +50 +70 +90 +110 +130
0
2
1
3
4
5
6
7
8
9
10
PVC + PP
PVDF
PVDF (PN 6)
PVC (PN 6)
PP (PN 6)
3 INSTALLATION
3.1 Installation Guidelines
Pressure-Temperature Diagram
Please be aware of the pressure-
temperature dependence according to the
respective fitting material.
Installation Guidelines
The conductivity transmitter must be
installed in a vertical position onto a
horizontal pipe or a weld-in fitting must be
usedthroughatankwalltoobtainthevertical
position.
With a cell constant K=10, the opening hole
of the small channel must be located on the
flow side.
The device must be protected against
constant heat radiation and other
environmentalinfluences,suchas magnetic
fields or direct exposure to sunlight.
Do not mount the device behind turbulence
generating fittings such as elbows, valves,
T-pieces, etc..
Caution: only tighten the plastic nut by hand
3.2 Installation
The conductivity transmitter 8225 can be
easilyinstalled into pipes using ourspecially
designed fitting system. (S020/1500)
1.The fitting must be installed into the
pipe according to the installation
specifications in section 3.1.
2.Insert the plastic nut onto the fitting
and let the plastic ring snap into the
guide bush .
3.Carefully insert the transmitter 8225 
into the fitting. If installed correctly, the
transmitter cannot be rotated.
4.Tighten transmitter housing to the fitting
with the plastic nut .
Application range
Fig. 3.1 Installation on a fitting S020

E-10-
CONDUCTIVITY 8225
Fluid Control Systems
3 INSTALLATION
3.3 General Electrical Connection
The connecting cable conducts the
measuring signal and power supply and
must not be installed in combination with
high voltage or high frequency lines. If a
combined installation cannot be avoided,
either keep a min. space of 30 cm (approx.
1 ft) or use coax cables. When using coax
cables observe faultless grounding of the
shield. For normal operating conditions, the
measuring signal can be transmitted by a
simple cable of 0.75 mm2 cross section.
If in doubt, always use a coax cable.
The power supply must be of good quality
(filtered and regulated).
Anearthingpoint is providedviaan earth
lug on the side of the enclosure (see fig.
3.1). For EMC purposes, this point must
be connected locally to a good earth.
3.4 Electrical Wiring 12-30 VDC
3.4.1 8225 without relays
Electrical wiring either via cable plug to DIN
43 650 or PG 13.5 cable gland.
Wiring via cable plug
Standard DIN 43 650 plug connector with
PG9-cable glands, cross section max. 1.5
mm2, IP65 rating (cf. fig. 3.2).
1.To open the connector remove the screw
(cf. fig. 3.2).
2.Remove internal part from external
part .
3.Connect according to the pin assignment
in fig. 3.3.
4.When re-assembling, the internal part
may be inserted into the plastic case in
90 °-step intervals as required.
Fig. 3.2 Plug assembly DIN43650 Fig. 3.3 Connection with cable plug
댷
1
2
3
훰훫훫
훫훫훱
훫훫훱
훫훫훱
L+(12-30 VDC)
L-(GND)
Not
assigned
Not assigned

E-11-
CONDUCTIVITY 8225
Fluid Control Systems
8225 V+
L+
L-
0V 0V
V+
L+
L-
8225
2
3
2
3
3 INSTALLATION
Fig. 3.5: PLC-connection
Note: The device can be easily connected to a PLC, independently of the respective
version (cf. fig. 3.5).
PLC
PLC
1234
Fig. 3.4 Pin assignment with cable gland
Connection to PG 13.5 cable gland
Remove the cover, pull the cable though
PG 13.5 cable gland and wire according to
pin assignment cf. fig. 3.4.
1: Not assigned
2: L+ (12-30 VDC)
3: L-
4: Earth (earth lug)
Sensor connection

E-12-
CONDUCTIVITY 8225
Fluid Control Systems
3 INSTALLATION
3.4.2 Connection 8225 with relays
The electrical wiring is possible via 2 cable
glands.
Remove the cover, pull the cable through
PG 13.5 and wire according to pin
assignment
cf. fig. 3.6).
1: Current output 4-20 mA
2: L+ (12-30 VDC)
3: L-
4: Earth (earth lug)
5: Relay 2
6: Relay 2
7: Relay 1
8: Relay 1
Fig. 3.6 Pin assignment with relays
Note: Depending on the PLC-version, the switch on the circuit board must be put to
position A or B (cf. fig. 3.6 and 3.7). In this case remove the strap (cf.fig. 3.6).
Fig. 3.7 PLC-connection
PLC
PLC
!
0V
V+
4...20 mA
L-
8225 L+ 8225 V+
L+
4...20 mA
0V
L-
Position A Position B
2
3
1
2
3
1
Attention: If the current output 4-20 mA is not utilised, it must be
connected to L- with switch in position A. For this purpose, use the
strap (see fig. 3.6).
1234
56 78
Strap
Sensor connection
Switch 

E-13-
CONDUCTIVITY 8225
Fluid Control Systems
3 INSTALLATION
L1
N
쵰
1234
+
-
mA
+
-
L1
N
쵰
1234
7
+
-
8910
mA
+
-
Strap Switch. 
(cf. fig. 3.7)
Strap
Sensor connection
Sensor connection
Fig. 3.8 Electrical wiring 8225 with power supply 230/115 VAC
230 VAC
115 VAC
230 VAC
115 VAC
8225
without relays
8225
with relays
3.4.3 Electrical Wiring 8225 with Power Supply 230/115 VAC
Remove the cover , the power supply board is in the bottom of the housing. Pull the cable
through PG 13,5 cable gland and wire according to fig. 3.8
The connection of the output signals (current and relays) are not affected.
If the current output of 4-20 mA is used, remove the strap (see fig. 3.6).

E-14-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
4.1 Operating and Control Elements
The operation is divided into 3 main menus
1 Display
Conductivity, temperature and output current are displayed within this menu, and the
"HOLD" function can also be obtained.
2 Parameter Definition
All the necessary adjustments, such as language, engineering units, cell constant,
temperature compensation factor, 4-20 mA measuring range, relay and filter are set within
this menu.
3 Testing
Conductivity can be simulated within this menu, allowing the user to test the process in the
"dry condition".
The non-compensated conductivity of the transmitter is also displayed within this menu.
The basic settings (Offset, Span) of the device can be changed within this menu.
125.6
m
S
Relay 1: contact closed
Relay 2: contact closed
Acceptance the chosen
parameter or adjusted
value
Choice of digit value
Steps from 0 to 9
Direction downwards
in menu or sideways
for digit selection

E-15-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
4.2 Operation Mode Display
The following units are indicated within the operation mode display:
Conductivity in the required engineering unit. If "0000" or "9999"
is displayed, input value is to low, respectively to high, change
unit or decimal point position
12.6 m S
20.6 °C
HOLD
10.32 m A
HOLD-function. If this function is activated, the transmitter
generatesanoutput current corresponding to the lastvaluebefore
the option was entered and the relays are blocked in their last
state. This allows the electrode to be cleaned without interruption
of the process. The display in the operation mode will flash and
there is no access to the parameter definition or the test menu,
while the HOLD-function is activated.
ENTER
ENTER
12.6 m S
HOLD
HOLD NO
HOLD YES
Press Enter for
5 seconds
The output signal 4-20 mA is proportional to the conductivity
according to the selected measuring range.
Temperature in °C or °F. If "---- °C" or "---- °F" is displayed,
temperature is out of range (-50...+150) or connection with Pt
1000 is interrupted.
To disactivate the HOLD function, enter the "HOLD" option again
and select "HOLD NO".

E-16-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
Selection between English, German, French or Italian.
Selection of engineering units for conductivity and
temperature.
Parameter definition of relays. This message only appears if
the relay option has been installed.
Damping selection. There are ten different steps available.
Back to the operation mode and save the new parameters.
4.3 Calibration Mode: Press simultaneously for 5 seconds
The following adjustments are set in the calibration mode display:
4.3.1 Language
The selected language is
confirmed by the Enter-key and
becomes immediately active.
Enter the sensor cell constant
Selection of temperature compensation mode (linear,
automatic or Teach-in function).
Determination of 4-20 mA measuring range.
UNIT
CELL CST
CURRENT
RELAY
FILTER
END
ENTER
ENTER
ENGLISH
DEUTSCH
ITALIANO
UNIT
FRANCAIS
LANGUAGE
LANGUAGE
T °COEFF
ENTER

E-17-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
0......9
ENTER ENTER
ENTER
ENTER
4.3.2 Engineering Units
The conductivity can be displayed in any engineering unit with 0, 1, 2 or 3 decimal points
but always with 4 digits.
µS
m S
MO hm
UNIT
ELEC CST
KO hm
DEC PT 3
DEC PT 2
DEC PT 1
DEC PT 0
°CELSIUS
0......9
ENTER
ENTER
ELEC CST
T °COEFF
K = 00.0000
4.3.4 Temperature-Compensation Coefficient
The transmitter offers three different modes of temperature compensation.
Linear compensation
The user enters one value for a compensation over the entire conductivity and temperature
range (e.g. 2,1 %/ °C). For no compensation enter 0,0 %/ °C within this option.
Compensation with memorized coefficient (AUTOAUTO
AUTOAUTO
AUTO)
The user can select between 4+1 products, whose temperature compensation coefficients
have been memorized over the entire temperature range (NaOH, HNO3, H2SO4, NaCl and
"special"). The memorized coefficients for NaCl apply for concentrations between 0.5 mg/
l up to 270 g/l. In most cases, the compensation with NaCl is sufficient. The option "special"
is explained in the following part.
Teach-in function
This function allows the practical definition of the temperature compensation coefficient
of a liquid over the required temperature range. The user enters first the temperature range
(T- and T+) of the fluid (the difference between T+ and T- must exceed 5 °C). The point
25 °C needs not be included, however, it must be exceeded during the measurement.
°FAHRENH
K = 01.0300
4.3.3 Cell Constant
The cell constant of the sensor is entered within this mode. This value is indicated on a
sticker on the enclosure and on the sensor cable.
The cell constant is an average value over the whole
measuring range. This can be adjusted depending on
the application as follows:
K-new = (Cond. reference / Cond. 8225) x K-real.
The reference conductivity can be given either by a
buffer solution or reference device.
If K=00.0000, the device is blocked and the displayed
conductivity is equal to zero.

E-18-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
0......9
ENTER
0......9
ENTER
0......9
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
CURRENT
NAOH
HNO3
H2SO4
NACL
SPECIAL
TEACH IN
CURRENT
T- = 000
T- = 015
T += 110
MEASURE
T ° = 065
CURRENT MEAS END
T °COEFF
T += 000
TC = 02.10
TC = 00.00
LINEAR
AUTO
The coefficients in
the "SPECIAL"option
equal zero until a
Teach-in function
has been
completed, i.e.
there is no
temperature
compensation of
the conductivity.
After, the device will be immersed into the solution (temperature < T- or < 25 °C if T- > 25
°C) and the solution is heated up. The temperature compensation coefficients will
automatically be determined until T+ or 25 °C (if T+ < 25 °C) is reached. The values are
memorized and can be called up any time by selecting "SPECIAL" in the "AUTO"option.
Themessage"MEASURE"
appears only when
temperature has
reached T-.
WARNING:Thetemperature increase must
be slow in order to compensate the thermal
resistanceof the sensor. Alsoavoid bubbles
appearing on electrode surface. The user
can quit the Teach-In function at any time
by pressing for a duration of 5 sec.
If the message "ERROR" appears on display,
it means that a problem has occured during
Teach-In option (for example, the liquid gas
been heated too quickly). In this case, the
operation must be repeated.
0......9

E-19-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
0......9
ENTER
0......9
ENTER
ENTER
Enter the beginning of the
measuring range
CURRENT
RELAY
4 = 00.00
4 = 00.00 20
= 00.00
20 = 10.00
Enter the end of
the measuring
range
4.3.5 Output Current
Within this mode, the measuring range of the conductivity measuring range is entered,
which corresponds to the output current 4-20 mA. E.g. 0 to 10 mS/cm corresponds to 4-
20 mA. The beginning of the measuring range might be larger than the end of it, e.g. 0 to
10 mS/cm corresponds to 20-4 mA (inverted output signal).
The adjustments (engineering unit and decimal point), which have been selected for the
conductivity display will be valid within this option.
4.3.6 Relay
Within this menu, the setting of the parameter limits can be defined. 2 limit values are
entered for each relay: 1- and 1+ or 2- and 2+. The user has also the option to invert the
relays and to set a delay time between 0 and 180 seconds. This delay shall prevent the
relays from being activated too quickly, e.g. when time for homogenization is required (e.g.
measurementsintankswith agitator). If the conductivity exceeds a limit value,thetransmitter
awaits the set delay time before activating the relay in order to introduce a hysteresis
effect. Units and decimal points as selected in the submenu "UNIT" are actived within this
menu.
Caution! The following condition must be observed 1- ≤1+, 2- ≤2+.
!

E-20-
CONDUCTIVITY 8225
Fluid Control Systems
4 OPERATION
RELAY 1- = 00.00
1- = 01.50 1 += 00.00
1 += 02.50INV NO
INV YES DEL.1 = 000
DEL.1 = 030 2-
= 00.00
2- = 08.50
2 += 00.00
2 += 09.50
INV NO
INV YES
Conductivity
Conductivity
Invert no
Invert yes
CLOSED
CLOSED
Contact
Contact
OPEN
OPEN
DEL.2 = 000
DEL.2 = 030
FILTER
0......9
ENTER
0......9
ENTER
ENTER
0......9
ENTER
0......9
ENTER
ENTER
ENTER
0......9
ENTER
0......9
ENTER
1- 1+
1- 1+
Delay Delay
Time
Relay
1-
1+
Conductivity
Enter the highest
value of threshold 1
Enter the delay
(seconds), which will
effect both of the
thresholds of relay 1
Enter the lowest
value of threshold 1
Enter the highest
value of threshold 2
Enter the delay
(seconds), which will
effect both of the
thresholds of relay 2
Enter the lowest
value of threshold 2