Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
[Or]
= Overrange (e.g. input short circuited).
[Err.cc]
= Cell constant not within 0.7...1.3 cm
[CAL]
= Calibration error (check electrodes and standard solutions).
[Err.MEM] = Fatal memory error (all factory settings are cleared. Have
your instrument serviced!).
A conductivity cell is active and stable only after wetting! For this
purpose it must be immersed for at least one hour in distilled water.
Rinse the cell always after use and store it in distilled water (add some
detergent to keep the spongy platinum surface in perfect condition).
A polluted cell may be cleaned with a soft detergent or diluted nitric acid.
Greasy substances may be removed with acetone or alcohol (never do
this with plastic electrodes!).
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.
Adjust the manual temperature compensation by pressing MODE,
e.g. [21.5C]. Then press CAL, select the desired temperature with
MODE, and press CAL again.
2.
Select the conductivity range by pressing MODE and press CAL.
3.
After rinsing the cell several times with a 0.01 M KCl standard
solution (1413 µS/cm), immerse it in that standard.
4.
The display will show the computed cell constant e.g. [1.04c] and will
calibrate automatically when readings are stable ([c] stops blinking).
5.
Rinse the cell with the sample and immerse it in that solution.
6.
Read the display (remember: compensated to 25°C!).
∗ Stirring the solution during the measurements promotes the
homogeneity and is therefore always recommended.
∗ Adjust the manual temperature compensation by pressing MODE.
Then press CAL, select the desired temperature with MODE, and
press CAL again.
∗ The instrument will refuse automatic calibration when the cell is
unstable. Insufficient stirring or a worn cell may be the cause.
.
-1
Error codes
Maintenance
Conductivity
measurement
2
Publicité
Table des Matières
