KROHNE OPTISENS CAC 050 R User manual

Installation and
Operating Instructions
OPTISENS
CAC 050
IAC 050
Measuring and control device
for conductivity measurements
07
/200
8

Manual OPTISENS CAC 050 IAC 050
OPTISENS CAC 050 IAC 050 2
Content
0. Introduction......................................................................................................................................................................................... 3
0.1 General .................................................................................................................................................................................................................. 3
0.2 Legal matters ......................................................................................................................................................................................................... 3
0.3 Safety..................................................................................................................................................................................................................... 4
0.3.1 Documentation symbols......................................................................................................................................................................................... 4
0.4 Features.................................................................................................................................................................................................................
0.4.1 Device ....................................................................................................................................................................................................................
0.4.2 Controller................................................................................................................................................................................................................
0.4.3 Connections ...........................................................................................................................................................................................................
1. Mechanical installation ...................................................................................................................................................................... 6
1.1 Installation of panel-mounting converters .............................................................................................................................................................. 6
1.2 Installation of wall-mounting converters................................................................................................................................................................. 7
2. Electrical connection.......................................................................................................................................................................... 8
2.1 Connection diagram panel-mounting converter..................................................................................................................................................... 9
2.2 Connection diagram wall-mounting enclosure..................................................................................................................................................... 10
3. Operation of the device.................................................................................................................................................................... 11
3.1 How to adjust parameters.................................................................................................................................................................................... 11
3.1.1 Selection between alternatives ............................................................................................................................................................................ 11
3.1.2 Adjustment of numerical parameters ................................................................................................................................................................... 12
3.2 Menu Overview .................................................................................................................................................................................................... 12
3.2.1 Main menu and basic settings ............................................................................................................................................................................. 12
3.3 Password and language ...................................................................................................................................................................................... 13
3.3.1 Enter password .................................................................................................................................................................................................... 13
3.3.2 Language ............................................................................................................................................................................................................. 13
4. Adjustments for the measurement ................................................................................................................................................. 14
4.1 Configuration of the converter.............................................................................................................................................................................. 14
4.2 c value (cell factor)............................................................................................................................................................................................... 1
4.2.1 Calibration via cell factor...................................................................................................................................................................................... 1
4.3 Cable compensation and averaging .................................................................................................................................................................... 16
4.3.1 Cable compensation (zero point correction) ........................................................................................................................................................ 16
4.3.2 Averaging............................................................................................................................................................................................................. 16
4.4 Temperature compensation................................................................................................................................................................................. 16
4.4.1 Calibration of the temperature measurement ...................................................................................................................................................... 17
4.4.2 Temperature coefficient ....................................................................................................................................................................................... 17
5. Adjustments of the controller.......................................................................................................................................................... 17
.1 ON/OFF controller................................................................................................................................................................................................ 18
.2 P / PI controller as impulse-frequency controller ................................................................................................................................................. 18
.3 P / PI controller as pulse-pause controller ........................................................................................................................................................... 19
.4 Activation and deactivation of the controller ........................................................................................................................................................ 20
. Turn-on delay....................................................................................................................................................................................................... 20
.6 External controller stop ........................................................................................................................................................................................ 20
.7 Manual operation of the relays............................................................................................................................................................................. 21
.8 Limit values .......................................................................................................................................................................................................... 22
.8.1 Turn-on delay....................................................................................................................................................................................................... 22
.9 Dosage check ...................................................................................................................................................................................................... 22
6. Alarm.................................................................................................................................................................................................. 23
6.1 Error messages.................................................................................................................................................................................................... 24
7. Output................................................................................................................................................................................................ 24
7.1 Current output ...................................................................................................................................................................................................... 2
7.2 Serial interface RS48 (option)............................................................................................................................................................................ 2
8. Operation and maintenance ............................................................................................................................................................ 25
8.1 Maintenance of the device................................................................................................................................................................................... 2
8.2 Display contrast ................................................................................................................................................................................................... 2
8.3 Exchange fuse ..................................................................................................................................................................................................... 2
8.4 Cleaning............................................................................................................................................................................................................... 2
8. Maintenance of the conductivity measurement ................................................................................................................................................... 26
8.6 Disposal ............................................................................................................................................................................................................... 26
8.7 Service ................................................................................................................................................................................................................. 26
8.7.1 Product info.......................................................................................................................................................................................................... 26
8.7.2 Analog inputs ....................................................................................................................................................................................................... 26

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8.7.3 Erase settings (reset)........................................................................................................................................................................................... 26
9. Technical data................................................................................................................................................................................... 27
9.1 Technical data...................................................................................................................................................................................................... 27
9.2 Dimensions .......................................................................................................................................................................................................... 28
9.2.1 Panel-mounting enclosure ................................................................................................................................................................................... 28
9.2.2 Wall-mounting enclosure ..................................................................................................................................................................................... 28
10. Device return form............................................................................................................................................................................ 29
11. Customer settings - for reference................................................................................................................................................... 30
0. Introduction
0.1 General
This manual applies to the following devices:
Device and type revision date
CAC 0 0 R 09/07
CAC 0 0 W 09/07
IAC 0 0 R 09/07
IAC 0 0 W 09/07
It contains technical information for the installation, start-up and maintenance. If you have any questions not
included in this manual please contact your supplier or the official representative of KROHNE Water Solutions
in your country.
0.2 Legal matters
Authorized personnel
Installation, connection, adjustment, start-up, and maintenance of the device are carried out by authorized
personnel with adequate qualification.
Liability
Responsibility as to suitability and intended use of these devices rests solely with the user. Improper
installation and operation may lead to loss of warranty. In addition, KROHNE Group's Standard General
Conditions of Sale and Delivery, found on the back of the invoice and forming the basis of the purchasing
contract, are applicable.
General limitation on liability
Unless otherwise expressly set forth in the Standard Terms and Conditions of Sale and Delivery, the Seller is
only liable for damages, whatever their legal basis is, in case they are based on willful action or gross
negligence. This limitation on liability does not apply in the event the Buyer raises claims relating to personal
injury or damages to property according to the product liability law based on a defect of the delivered goods.
Any advice given by the Seller, in particular regarding the application of the delivered goods, shall only commit
the Seller if given or confirmed in writing.
Returning the device
If you need to return the level gauge to the manufacturer or supplier, please read to the instructions and
complete the form given in the appendix.
Warranty
Please consult KROHNE Water Solutions General Terms and Conditions for information on guarantee and
liability.

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0.3 Safety
Please check for damages immediately after receiving the devices and report any damages within 24 hours to
the delivering company. Never work with a damaged device.
Keep this manual at a safe place where you can always look up the safety instructions and the information on
handling and usage.
This device was designed and built according to the safety measurements for electronic devices and has left
our company in perfect working condition. To preserve this condition and to ensure safe usage follow all
instructions carefully and pay special attention to all warnings issued in this manual. If the device is visibly
damaged or has been stored inappropriately or if there are any doubts concerning safe usage, shut it down
and make sure it cannot be restarted by accident.
0.3.1 Documentation symbols
A set of symbols is used to give warnings or information relevant to particular applications. These are defined
below:
Caution Attention
Information that, if not followed, may lead to actions resulting in incorrect functioning of the device.
Warning
Information that, if not followed, may lead to actions resulting in measurement error, personal injury and/or
damage to the device.
NOTE Is used to highlight interesting details.

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0.4 Features
0.4.1 Device
Cell factor (recommendation)
0.00…20.00 MΩ/cm c = 0.0 /cm
0.000…2.000 µS/cm c = 0.0 /cm
0.00…20.00 µS/cm c = 0.0 /cm
0.0…200.0 µS/cm c = 0.0 /cm
0.000…2.000 mS/cm c = 0.2/cm
0.00…20.00 mS/cm c = 1/cm
Measuring ranges
conductive
0.0…200.0 mS/cm c = 10/cm
0.00…2.00 mS/cm c see measuring cell
0.,0…200.0 mS/cm c see measuring cell
Measuring ranges
inductive
0…2000 mS/cm c see measuring cell
Measuring range temperature -30.0…+140.0°C
Display Measured value with dimension
Temperature with dimension
Status display sensor, controller & alarm
Temperature compensation manually or automatically with Pt100 or NTC
0.4.2 Controller
Set points 2 set points with adjustable direction
Controller types ON/OFF controller with hysteresis
P controller as Pulse-Pause-, Impulse-Frequency- or steady controller
PI controller as Pulse-Pause-, Impulse-Frequency- or steady controller
Hysteresis adjustable within the measuring range
P range X
P
adjustable within the measuring range
Integral time T
N
0…2000 s
Least pulse 0.1…9.9 s
Pulse+ pause time 02…99 s
Impulse frequency 00…72 equiv. to 0...7200 pulses/h
Turn-on delay 0…200 s
Alarm function min. and max. limit and onset delay, power failure alarm,
Dosage control 0…2000 s
0.4.3 Connections
Relays 3 potential-free contacts (2x controller, 1x alarm)
6 A, 2 0 V, max. 0 VA
Analog outputs 2x 0/4…20 mA galvanically isolated
max. loading 00 Ohm
Analog inputs 1 measuring input for conductivity sensor
1 measuring input for Pt100 or NTC
Digital input external controller stop or lack-of-water indication
Serial interface (Option) RS48 , Baud rate 9600, data format 8 Bit,
1start and 1stop bit, no parity

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1. Mechanical installation
On Chapter 9.2 you will find detailed instructions for the installation.
For panel-type meters you have to prepare an opening of 92 x 92 mm / 3.6” x 3.6”. Install the device and fix it
with the two mounting clips which were part of the delivery.
You can install devices in wall-mounting enclosures either by hanging them upon the center slot or by sliding
the slot under a screw, which is an alternative for limited space. Either way you have to fix it additionally with
two screws.
ATTENTION
Install the device in a place where it is not put under mechanical or chemical strain!
Mind the protection class:
•Panel mounting version: IP 4 (front), IP 30 (Housing)
•Wall mounting version: IP 6 (closed terminal cover)
1.1 Installation of panel-mounting converters
Prepare an opening of 92 x 92 mm / 3.6” x 3.6”.
Install the device from the front side and fix it with the
two mounting clips which were part of the delivery.
Screw tight until the device is fixed perfectly.

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1.2 Installation of wall-mounting converters
Unscrew the terminal cover.
Drill three holes (max. M ) according to the drawing.
Mind that there are two ways for installation:
(1) You can hang the device upon the upper screw.
In that case drill the upper hole 120mm / 4.7” above
the lower two.
(2) Or you can slip the fixture on the back of the
device under the upper screw. In that case the upper
hole has to be another 1 mm / 0.6” higher.
Insert the upper screw and make sure to leave at
least 3 mm between wall and screw head for the
fixture.
Mount the device and fix it with the two lower
screws. Close the terminal cover or start with the
connections.

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2. Electrical connection
You will find a detailed connection diagram on the following pages.
Before connecting the power supply check the information on the nameplate of the device!
ATTENTION
Input, output and control lines must be installed separate from each other and separate from power lines!
For inputs and outputs use screened lines and connect the screen on one side only.
The conductivity measurement is interference-sensitive. Use a special screened cable and over long
distances or in humid atmosphere additionally an impedance converter.
For the connection of the temperature sensor use a low-resistance cable with a large diameter.
When using the relays, mind that with inductive loads, interference must be suppressed. If that is not
possible, the relay must be protected at the terminal block in the converter by a resistance-capacitance filter
or, in case of direct current, by a free- wheeling diode.
Current up to Capacitor C Resistance R
60 mA 10 nF 260 V 390 Ohm 2 Watt
70 mA 47 nF 260 V 22 Ohm 2 Watt
1 0 mA 100 nF 260 V 47 Ohm 2 Watt
1.0 A 220 nF 260 V 47 Ohm 2 Watt

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2.1 Connection diagram panel-mounting converter
Connection Termin
als
Notes
2 = Inner electrode = white
3 = Outer electrode = brown
Conductivity sensor
conductive (CAC)
2 + 3
+ 6 Integrated Pt 100 = yellow & green
Conductivity sensor
inductive (IAC)
1 – 4
+ 6
Measurement = cable #3
1 = screen, 2 = core cable #3
Voltage supply = cable #1
3 = screen, 4 = core cable #1
Integrated NTC = cable #2
= screen, 6 = core cable #2
Pt 100 (CAC) / NTC (IAC) + 6
Analog output 11 + 12 9 = + , 10 = - , max. burden 00 Ohm
Relay 1 18 + 19
Relay 2 20 + 21
Relay 3 22 + 23 Alarm relay
Power supply 24 – 26 check information given on name plate
RS48 (option) Sub-D 3 = +, 8 = -
4/7 bridged activates terminating resistance
NOTE
When using different sensors or cables refer to the instructions for connection and cable color specifications
given there.

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2.2 Connection diagram wall-mounting enclosure
Connection Termin
als
Notes
1 = Inner electrode = white
2 = Outer electrode = brown
Conductivity sensor
conductive (CAC)
1 – 2
4 + Integrated Pt 100 = green & yellow
Conductivity sensor
inductive (IAC)
1 - 4 Measurement = cable #3
1 = core, 2 = screen cable #3
Voltage supply = cable #1
Integrated NTC = cable #2
4 = screen, = core cable #2
PT 100 (CAC) / NTC (IAC) 4 +
Display contrast Display Potentiometer to adjust brightness
Analog output 11 + 12 11 = + , 12 = - , max. load 00 ohm
Relay 1 14 + 1
Relay 2 16 + 17
Relay 3 18 + 19 Alarm Relais
Power supply 20 - 22 Check information given on name plate
RS 48 (option) 23 + 24 23 = + , 24 = - , Jumper A activates terminating resistance
Digital input 26 + 27 26 = + , 27 = - , external controller stop and / or low water indication
NOTE
When using different sensors or cables refer to the instructions for connection and cable color specifications
given there.

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3. Operation of the device
1 Measured value
2 Status relay 1
3 Status relay 2
 relay OFF
 relay ON
4 Temperature
Controller
AUTO: controller ON
MAN : controller OFF (manual operation
of the relays)
6 Orientation aids
7 Key left ()
8 Key up ()
9 Key down ()
10 Key right ()
11 Key “Enter“
When turned on the device shows the measured values of conductivity and temperature together with the
controller mode (Man) and the status of the relays S1 and S2 (both OFF).
With five membrane keys you can move within the menu:
•With key  you enter the main menu.
•With keys  and  you move up and down in the menu.
•With key  you address a menu or parameter.
•With key  you leave a menu without storing
•With key “Enter“ changes are stored.
For your convenience triangles in the display indicate the directions you can take from your position in the
menu.
3.1 How to adjust parameters
Temp. comp.
 Manual.
1) When you address a parameter the actual setting is displayed.
2) Switch to the next alternative setting with key.
Temp. comp.
 Auto
Temp. comp.
 Manual.
3) When you have come to the last alternative, pressing the key once
more will bring you back to the start.
3.1.1 Selection between alternatives
For many parameters you have the choice between two or more alternatives, for e. g. between manual and
automatic temperature compensation. For these parameters you need only key. Switch from one
alternative to the next until you either come back to where you started or until you reach the alternative you
were looking for.
With these parameters any changes are immediately valid - there is no need to store the change.

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Enter password
 0 8 1) Address the parameter with key .
Enter password
0 8 
2) A double triangle appears behind the number indicating that the
number can be changed now with keys and .
Enter password
 062
3) Store the new value with key „Enter“. The double arrow disappears -
the new value is stored.
3.1.2 Adjustment of numerical parameters
Numerical parameters can only be altered when a double arrow is visible behind the number. This double
arrow appears when you address the parameter with key.
Adjust the parameter with keys  and . A short pressure on the key changes the last decimal by 1. If you
keep the key pressed, the value will continue changing until the pressure is released.
Store the changes with key „Enter“. The double arrow disappears.
3.2 Menu Overview
6.98 mS 2 .0°C
 S1  S2 Auto
Display of the measured values
 Press key  to enter the main menu.
Main menu
Temp. comp. Temperature compensation
Enter password Password function
Set points Controller settings - set points, P ranges, I functions
Limit values Alarm function
Basic settings
Basic settings  Cal. Pt 100 / NTC
Service Contr. settings
Turn-on delay
Analog output
Language
Temp. coeff.
Cell factor
All parameters which are set just once
at the beginning can be found in the
menu “basic settings“
Cable Comp.
Bus address
Meas. range
Averaging
3.2.1 Main menu and basic settings
The parameters are sorted into two menus: In the main menu you will find all functions which are used
regularly. The menu basic settings contain all parameters which are set just once during start-up.
On the following pages you will find information on how to adjust parameters and which parameters you
need for which application. The information follows the following scheme:
1) General adjustments: password and language
2) Adjustments for measurement: cable compensation and temperature compensation, averaging and
adjustment of the cell factor
3) Adjustments of the controller: selection of the controller version and corresponding parameters
4) Adjustments to read out data: analog, digitally and/or as alarm

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3.3 Password and language
Main menu
.
.
Enter password  Enter password
0 6 Code
3.3.1 Enter password
To get access to the various parameters you have to enter the correct password:
•Code 11 gives access to the parameters „calibration“, „temperature compensation“, and „set points“.
•Code 86 gives access to all parameters and functions.
With any other number it is impossible to select, view or change any parameter.
Main menu
.
.
Basic settings
Basic settings 
.
.
Language
Language  We speak
English
3.3.2 Language
For the communication with the device you can choose from a variety of languages.
Since choosing a language is part of the basic settings, it requires code 86. If a different code is set, you will
be asked to enter the correct password.

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4. Adjustments for the measurement
Main menu
Temp. comp.
.
Selection between automatic and manual temperature compensation,
adjustment of temperature for manual compensation.
.
.
Basic settings
Basic settings  Cal. temp. Calibration of the temperature measurement.
.
.
Temp. coeff. Adjustment of the deviation per °C
Cell factor c Adjustment of the cell factor (sensor charact.)
Cable comp. Zero point correction (cable capacitance)
.
Meas. range Selection of the measuring range
Averaging Activation of a smoothing function
The conductivity measurement is influenced by temperature. This influence is compensated automatically or
manually. For manual compensation the temperature is entered manually, for automatic compensation a
temperature sensor must be connected. Compensation is carried out linearly using a temperature coefficient
in %/K which depends upon the composition of the test water.
The capacitance of the sensor cable can lead to a slight deviation of the measurement. This deviation can be
eliminated by cable compensation.
Especially in the lower measuring ranges the measurement tends to get a bit unsteady due to the high
resistance of the water. The signal can be smoothed out by activating an averaging function.
Conductivity sensors are optimized for certain measuring ranges by their geometric dimensions. These
define the cell factor (c value). If you want to use a sensor with a different cell factor or if you want to
calibrate the measurement, adjust the cell factor accordingly.
All these adjustments are part of the basic settings, since they are carried out only once at the beginning.
4.1 Configuration of the converter
Main menu
.
.
Basic settings
Basic settings 
.
.
Configuration
Configuration  Measurement
Temp. sensor
The devices CAC 0 0 and IAC 0 0 2 analog inputs:
Input 1 is for conductivity measurements (conductive with CAC 0 0, inductive with IAC 0 0) for a variety of
measuring ranges:
Method Measuring range Sensor
conductive 0.00...20.00 MOhm/cm c = 0.0 /cm with Pt100
0.000...2.000 µS/cm c = 0.0 /cm with Pt100
0.00...20.00 µS/cm c = 0.0 /cm with Pt100
0.0...200.0 µS/cm c = 0.0 /cm with Pt100
0.000…2.000 mS/cm c = 0.2/cm with Pt100
0.00...20.00 mS/cm c = 1/cm with Pt100
0.0...200.0 mS/cm c = 10/cm with Pt100
0.00...20.00 mS/cm Sensor with NTC
0.0...200.0 mS/cm Sensor with NTC
0...2000 mS/cm Sensor with NTC

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Input 2 is for temperature measurements.
At works the CAC 0 0 is configured for the measuring range 0.000…2.000 mS/cm.
The IAC 0 0 is configured for the measuring range 0.0…200.0 mS/cm.
With code 99 you can change the configuration. If you have entered code 99, a new menu appears at the
end of the list of basic settings called “configuration“.
Displayed is always the actual active configuration. With key  you can switch from one alternative to the
next, i. e. for measurement from one measuring range to the next and for temperature from Pt100 to NTC.
Press the key again until you reach the desired configuration or return to the original setting.
NOTE
A variety of conductive sensors is available with optimized design for certain measuring ranges, expressed in
the c value. Whenever you select a measuring range in the menu “configuration“, the converter automatically
selects the appropriate c value. In the basic settings use the menu “cell factor c“ to check, change or adjust
the c value according to your sensor.
4.2 c value (cell factor)
Main menu
.
.
Basic settings Basic settings

.
.
Cell factor c
Cell factor c  Cell factor c
0.0 0
Please make sure that the cell factor of the sensor is appropriate for the selected measuring range. In
contrast to the device which can be used for all ranges, the sensor’s applicability is limited by its geometrical
design, i. e. the size and arrangement of its electrodes. The cell factor is the numerical expression of this
design. With this cell factor the device can process the measurement and calculate standardized conductivity
values.
The cell factor is a sensor characteristic. You will find it indicated on the sensor. Prior to measurement, check
that the cell factor stored in the device corresponds to the sensor used.
4.2.1 Calibration via cell factor
The cell factor of a sensor can change slightly due to pollution or aggressive cleaning. It might even be
influenced by the armature. These deviations can be eliminated by determining the conductivity with a
comparative method and adjusting the cell factor until the measured value displayed by the device equals
this conductivity.
NOTE
This calibration is only as good as the comparative method! Since it requires sophisticated equipment and
some skills, we advise to do it only if the highest precision is required. Usually the errors caused by
temperature measurement or inappropriate temperature coefficients are much higher than the deviations of
the cell factor.

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4.3 Cable compensation and averaging
Main menu
.
.
Basic settings Basic settings

.
.
Cable compensation
Cable comp. 
.
0.00 mS
press& simultaneously
.
.
.
Averaging
Averaging  Averaging
ON
4.3.1 Cable compensation (zero point correction)
The cable connecting the sensor to the device can cause a capacitive error. To detect and eliminate this
error, connect the sensor to the device and let the dry sensor hang free in the air. If the measured value
displayed is not zero, then compensate by pressing keys  and. Now the value displayed is zero.
4.3.2 Averaging
Especially in the lower ranges the signal might become a bit unstable, due to the very high resistance of the
solution. In that case you can smooth out the signal by averaging over subsequent measurements. When the
averaging function is activated, the average is displayed instead of the single measured values.
4.4 Temperature compensation
Main menu
Automatic
compensation
Manual
compensation
Temp. comp.  Temp. comp.  Temp. comp.
.
Auto comp. Manual comp.
.
Temperature
.
2 .0°C
.
.
Basic settings
Calibration
temperature
Basic settings  Cal. temp.  Cal. temp.
.
0.0°C
.
.
.
Temperature
coefficient
Temp. coeff.  Temp. coeff.
2. %/K
Select between two ways of compensation:
1) Automatic compensation with temperature sensor
Mind that the temperature sensor should always measure the temperature around the conductivity sensor.
When conductivity sensor and temperature sensor are not immersed in the same solution, better switch to
manual compensation.
2) Manual compensation
If the temperature can be regarded as constant, you can enter the temperature manually instead of
measuring it continuously. The device will then compensate the temperature error of this temperature.

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4.4.1 Calibration of the temperature measurement
When using a 2-wire connection for the temperature sensor, please check the temperature measurement in
the beginning. If the displayed temperature differs from the real temperature, enter the deviation as
correction in the basic settings. This correction will be added to all temperature measurements. If your
calibration was correct, the temperature displayed is now equal to the real temperature.
4.4.2 Temperature coefficient
The temperature influence on the conductivity depends upon the composition of the solution and often
cannot be expressed by a simple equation. Instead the temperature dependency is compensated using a
linear coefficient given as deviation in % per K.
For most applications a coefficient of 2. %/K can be used to good results. For ultra-pure water better select
the non-linear compensation “pure water“.
5. Adjustments of the controller
Main menu
.
.
Set points
.
Selection of ON/OFF, P or PI controller, adjustment of P ranges and I
functions for 2 set points.
.
Basic settings
Basic settings 
.
.
Contr. settings
Turn-on delay
Adjustment of frequencies and pulse/pause
times, hysteresis, direction of the control
action, delay
For any type of controller you have to enter one or two set points, and you have to tell the device whether
these set points are reached by increasing or decreasing the measured value.
You can choose between three different controller versions:
ON OFF controller
The ON/OFF controller switches ON if the measured value exceeds the set point and OFF if it drops back
below it or vice versa. Dosage is always carried out with 100% (ON) or 0% (OFF). The parameter for an
ON/OFF controller is the hysteresis.
P controller
The P controller or proportional controller reduces the dosage in the vicinity of the set point proportional to
the control deviation. This is easily achieved if the analog output is used as steady control output. If the
relays are used, the proportional reduction is achieved by either reducing the switch frequency (Impulse-
frequency controller) or reducing the time within a given period of time in which the relay is ON (pulse-pause
controller). The parameters for a P controller are the P range and the impulse- frequency or the pulse+
pause time and the minimum pulse. (See Point .3)
PI controller
The PI controller is a P controller with an additional I function. Adjustments and parameters are the same as
for a P controller. Additionally the integral action time has to be adjusted which determines the I function.
The I function eliminates the P controller’s disadvantage of a remaining steady-state deviation.

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5.1 ON OFF controller
Main menu
.
Set point S1 You can choose different
.
1, 0 mS controller versions for S1
Set points  P range S1 and S2
.
0,00 mS
.
Integral time S1
000 sec.
Set point S2
0, 0 mS Controller Settings
P range S2
.
0,00 mS
.
Integral time S2 Direction S1
.
000 sec. Raise
Direction S2
Basic settings Lower
Basic settings 
.
Hysteresis
Contr. settings  0,01 mS
For an ON/OFF controller you have to set the following parameters:
1) Set points S1 and S2
Set point S1 refers to relay 1, set point S2 refers to relay 2.
2) P range and integral action time for S1 and S2
For an ON/OFF controller set P range = 0 and integral time = 0.
3) Acting direction for S1 and S2
Select “raise“ if the dosage raises the measured value.
Select “lower“ if the dosage lowers the measured value.
4) Optionally a hysteresis
The hysteresis prevents fast switching in the vicinity of the set point. If hysteresis is activated (by setting a
value > 0) the relay switches only when the set point is exceeded by half the hysteresis.
5.2 P PI controller as impulse-frequency controller
Main menu
.
Set points and
.
controller version
Set points  Set point S1 You can choose different
.
1, 0 mS Controller versions for S1
.
P range S1 and S2
.
0,00 mS
Integral time S1
000 sec.
Set point S2
0, 0 mS Controller settings
P range S2 Pulse-Freq. S1
0,00 mS 00*100 l/h
Integral time S2 Pulse-Freq. S2
000 sec 00*100 l/h
Direction S1
Basic settings Raise
Basic settings 
.
Direction S2
Contr. settings  Lower

Manual OPTISENS CAC 050 IAC 050
19 OPTISENS CAC 050 IAC 050
For an impulse-frequency controller you have to set the following parameters:
1) Set points S1 and S2
S1 refers to relay 1, S2 refers to relay 2.
2) P range and integral action time for S1 and S2
Adjust a P range > 0. For a P controller set integral time = 0, for a PI controller set an integral time > 0.
3) The acting direction for S1 and S2
Select „raise“ if the dosage raises the measured value.
Select „lower“ if the dosage lowers the measured value.
4) Pulse-frequencies for S1 and S2
Enter the maximum pulse-frequency that corresponds to 100% dosage.
5.3 P PI controller as pulse-pause controller
Main menu
.
You can choose different
.
Set points and
controller version
controller versions for S1
Set points  Set point S1 and S2
.
1, 0 mS Controller settings
P range S1 Pulse-Freq. S1
.
0.00 mS 00*100 l/h
.
Integral Time S1 Pulse-Freq. S2
000 sec. 00*100 l/h
Set points S2 Direction S1
0. 0 mS Raise
P range S2 Direction S2
0.00 mS lower
Integral time S2
.
000 sec.
.
Pulse+Pause
Basic settings 10 s
Basic settings 
.
Least Pulse
Contr. settings  0.1 s
The pulse+pause
time must be twice as
long as the least
pulse time
For a pulse-pause controller you have to set the following parameters:
1) Set points S1 and S2
S1 refers to relay 1, S2 refers to relay 2.
2) P range and integral action time
Adjust a P range > 0. For a P controller set integral time = 0, for a PI controller set an integral time > 0.
3) Pulse-frequencies for S1 and S2
Both frequencies must be set to 00, otherwise the controller will act as an impulse-frequency controller.
4) The acting direction for S1 and S2
Select „raise“ if the dosage raises the measured value.
Select „lower“ if the dosage lowers the measured value.
5) Pulse + pause time
Define a period of time during which the relay is proportionally to the control deviation ON (pulse) or OFF (pause),
respectively.

Manual OPTISENS CAC 050 IAC 050
OPTISENS CAC 050 IAC 050 20
5.4 Activation and deactivation of the controller
The controller is activated and deactivated from the main display without any menus. Press key to switch
from Manual Mode (controller OFF) to Automatic Mode (controller ON) and vice versa. The actual mode is
indicated in the display.
CAUTION
Make sure that the controller is deactivated before connecting dosing pumps or other actuators!
Main menu
.
.
Basic settings
Basic settings 
.
.
Turn-on delay
Contr. settings 
Turn-on delay
OFF  Turn-on delay
ON
Turn-on delay
180 s
5.5 Turn-on delay
Set a delay time which has to pass before the controller is activated after start-up or power interrupt. This
allows the measurement to settle and prevents inappropriate dosage of chemicals.
5.6 External controller stop
You can activate or deactivate the controller with an external switch by using the digital input. This feature
requires no settings or adjustments. If the digital input is short- circuited, the controller stops, and the
message „external controller stop“ appears in the display.
NOTE
This feature can also be used as lack-of water indication. Just connect a level sensor to the digital input.