KROHNE OPTISENS CAC 050 EN User Manual

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Manual OPTISENS CAC 050 / IAC 050

OPTISENS CAC 050 / IAC 050

Input 2 is for temperature measurements.

At works the CAC 050 is configured for the measuring range 0.000…2.000 mS/cm.
The IAC 050 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

Cell factor c

Cell factor c
0.050

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.