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Select (
CAL
) to get to the menu item „
Calibration
“ and then on to the
Calibration menu
:
> The calibration procedures for the respective sensor type are displayed.
Choose your desired calibration procedure by selecting the respective menu item.
The sensor must be thoroughly cleaned with distilled or deionized water prior to and between every
measurement.
Immerse the sensor into the calibration solution and wait until a stable measured value is reached.
Ensure that the calibration medium is mixed properly and watch for the temperature balance.
9.4.2.1 Data input
Under menu item „
Input
“, you can enter and change the specific characteristics of the connected sensor, e.g.
ones that were previously defined in the lab, individually.
> Select the respective submenu item for which the settings should be changed.
Zellkonst.
Cell constant
nLF/LIN Tempkoef.
Temperature compen temperature coefficient
Kabeloffset.
Cable offset
TDS Faktor
TDS factor
An input dialog will allow you to change the respective calibration/sensor values and their respective
limits. If these are not reached or exceeded, there will be an error message,
which will ask you to enter a value within these limits.
The temperature compensation can be set as follows:
Lin:
Linear temperature compensation with adjustable temperature coefficient
nLF:
non-linear temperature compensation (for natural waters as per DIN EN 27888)
out:
For measurements without temperature compensation, the temperature coefficient
must
be set
to „0 %/K“ under LIN.
Via (
INFO
) or (
CAL
) you select the position to change.
Via (
CONF +1
) or (
LOG -1
) you change the position.
(
ON/OFF
) confirms and saves your setting.
(
MEAS
) terminates the entry dialog without transferring the value.
9.4.2.2 Temperature offset
Under menu item „
Temp.Offs.
“ you can enter an offset for the temperature value.
> Select „
Temp.Offs.
“.
An input dialog allows you to set up the offset. This value can be positive or negative.
Via (
CONF +1
) or (
LOG -1
) you selected the desired setting.
(
ON/OFF
) confirms and saves your setting.
(
MEAS
) terminates the entry dialog without transferring the value.
9.4.2.3 One point calibration
The measuring signal will be calibrated at this one point by means of a defined calibration solution or with a
known nominal value, e.g. via an independent procedure or a lab/field device.
> Sie werden aufgefordert, den Sensor in das Kalibriermedium zu tauchen.
Confirm this dialog with (
ON/OFF
). The currently measured value is displayed.
If the measured value is in stable condition, reconfirm the dialog box with (
ON/OFF
).
> You will be prompted to enter a nominal value.
Via (
CONF +1
) or (
LOG -1
) you selected the desired setting.
(
ON/OFF
) confirms and saves your setting.
(
MEAS
) terminates the entry dialog without transferring the value.
