C931 • C932 • C933
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pH measurement
1.
Select [pH] by pressing
MODE
. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press
CAL
.
2.
The display shows up to five of the 9 buffers in memory, e.g. [7.00] and [4.00].
Select the proper values or enter manually special values and press
CAL
.
The
unused buffers should be switched off.
3
. Rinse the electrodes with distilled water and immerse them in the first buffer
solution. Select [CALIBRATE], press
CAL
and follow the instructions on the
screen until the calibration is finished.
4.
After rinsing the electrodes with distilled water, immerse them in the samples
and read the display.
5.
Rinse the electrodes always with distilled water after use and store them in a
3...4 M KCl solution.
Using pH electrodes with an abnormal zero point:
1.
Select [E0 = x mV] and press
CAL
.
2.
Enter the zero point (Eo) of the electrode and press
CAL
.
• A blinking decimal point warns you for unstable measurements. Wait to read
the display!
• Stirring the solution during the measurements promotes the homogeneity and
is therefore always recommended.
• Press
Ú
to change the resolution from 0.1 to 0.001 pH.
mV measurement
1.
Select [mV] by pressing
MODE
. The display will immediately show the meas-
ured value according to the previous calibration. Should you want to recali-
brate, press
CAL
.
2
. Immerse the electrodes in a standard solution of known potential, adjust to
the proper value and press
CAL
.
• A blinking decimal point warns you for unstable measurements. Wait to read
the display!
• Stirring the solution during the measurements promotes the homogeneity and
is therefore always recommended.
• Press
Ú
to change the resolution from 1 to 0.1 mV.
Temperature measurement
1.
Select [°C] by pressing
MODE
. Without Pt1000, adjust the manual temperature
compensation and proceed by pressing
MODE
. Should you want to recalibrate,
press
CAL
.
2
. Immerse the Pt1000 in a standard solution of known temperature. Calibrate to
the proper value and press
CAL
.
