Adjustment and Calibration
30
Conductivity
The adjustment of the conductivity channel is done by adjusting the cell parameter. To achieve this only one
adjustment point is necessary.
Point
Display
Cell parameter
Initial Conductivity
1.
"CD xx.xx°"
0.xxxx
14.000 mS/cm
First of all set the displayed adjustment value to the value of your reference solution. Then make sure that the
solution has a stable temperature of exactly 25.00 °C. Wait until both the temperature and the conductivity
values in the display become stable before pressing the navigation key
. After that the cell parameter
is being calculated and will be stored in the instrument.
pH
It is necessary to adjust th pH channel before each usage. It is achieved using two adjustment points.
Point
Display
Initial pH value
1.
"PH1"
6.00
2.
"PH2"
8.00
A pH adjustment has to be done according to the following instructions:
Set the mode of temperature compensation to the mode you have to use afterwards. Prepare 2 buffer
solutions which should not be more different than 2 pH values from each other and which are around the
value you expect from your measurement. If you expect to measure values around pH 6 then use the pH 5
and pH 7 buffer solutions for instance. The adjustment has to begin with the lower pH value and to end with
the higher pH value. Preset the buffer solutions value using the
and
navigation keys.
Before dipping the probe into the buffer solution it has to be flushed with distilled water and dried by
carefully dabbing it. Depending on the mode you have chosen the temperature sensor must also be flushed
and dried. Then dip both into the buffer solution and wait until the measuring values become stable. In this
case apply the value using the navigation key
. Flush and dry the probes before continuing with the
second adjustment point. The second point is adjusted in the same way. After the last adjustment point has
been completed the instrument displays "ADJ OK" in the upper line of its display. If the adjustment is not
correct, the instrument displays "ADJ ERR" in the display along with a long warning beep. In this case the
adjustment values will be discarded and the procedure has to be started from the beginning. A failed
adjustment can also be an outcome of a defective instrument.
Cancelling the adjustment procedure
If you are uncertain to have entered the correct values at any step in the adjustment procedure you can cancel
the process at any time. Cancelling the operation will discard the adjustment values.
Restoring adjustment values with factory adjustment values
If you have failed to adjust the instrument properly, you can overwrite the user adjustments with a factory
adjustment value set which has been stored into the instrument during production process. Please refer to
chapter "Basic settings".
