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The cell constant depends on the physical dimensions of the platinum
plates. They are coated with a spongy black platinum deposit. This
increases greatly the effective surface and reduces polarising effects.
Since the coating of platinum black is quite resistant to chemical action,
the cell constant remains fairly constant during the electrode life time.
1.
Select the conductivity-range by pressing MODE.
2.
After rinsing the cell several times with a 0.01 M KCl standard
solution (1413 µS/cm), immerse it in that standard. The solution
temperature is not so critical but should lie between 0°C and 30°C.
When no Pt1000 is used, do not forget to compensate manually first!
3.
Press CAL. The display shows the reference temperature [r.20] or
[r.25]. Select the desired value with
4.
The display will show the computed cell constant e.g. [1.045c] and
will calibrate automatically when readings are stable ([c] stops
blinking).
5.
Rinse the cell several times with the sample, immerse it in that
solution and read the display.
6.
Rinse the cell always after use and store it in distilled water (add
some detergent to keep the spongy platinum surface in perfect
condition).
∗ Stirring the solution during the measurements promotes the
homogeneity and is therefore always recommended.
∗ Read temperature by pressing MODE. Without Pt1000, adjust the
manual temperature compensation with
pressing MODE.
TROUBLE SHOOTING
Try this procedure if you suspect the electronic performance of the
instrument.
1.
Leave the conductivity input open.
2.
Switch the instrument ON.
3.
Select the conductivity range by pressing MODE. The display should
show [0.0] ± 0.1 µS/cm. Run the Calibrate procedure if erroneous
values are read.
This procedure permits to calibrate automatically all amplifiers of the
instrument.
1.
Leave the conductivity input open.
2.
Switch the instrument ON while holding CAL pressed.
3.
The display shows [SELFCAL] for a while and returns to the
measurements.
This procedure resets the instrument to the original factory settings.
1.
Switch the instrument ON while holding MODE pressed.
2.
The display shows [rESEt] for a while and returns to the measure-
ments.
or
. Press CAL to continue.
or
and proceed by
Conductivity
measurement
Simple test
Calibrate
Reset
4
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