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Important
pH measurement
mV measurement
rH
measurement
2
(C868)
Temperature measurement
3
•
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 obligatory!
•
The instrument will refuse automatic calibration when the electrode is unsta-
ble. Insufficient stirring or a worn electrode may be the cause.
1. Select the desired input, e.g. [CH.1], by pressing MODE. The display will imme-
diately show the measured value according to the previous calibration. Should
you want to recalibrate, press CAL.
2. The display shows five of the 9 buffers in memory (1.68, 4.00, 4.01, 6.87, 7.00,
9.18, 9.21, 10.01, 12.45). 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 of the electrode and press CAL.
•
Press ê to change the resolution from 0.1 to 0.001 pH.
1. Select the desired input, e.g. [CH.2], by pressing MODE. The display will imme-
diately show the measured value according to the previous calibration. Should
you want to recalibrate, press CAL.
2. Immerse the electrodes in a standard solution of known potential, adjust to
the proper value and press CAL. Press Hold to reset the calibration.
•
Press ê to change the resolution from 1 to 0.1 mV.
1. Select [rH
] by pressing MODE.
2
2. After calibrating and rinsing the pH and redox electrodes with distilled water,
immerse them in the solution to be measured and read the display.
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. Press Hold to reset the calibration.
C861 • C862 • C863 • C864 • C868
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