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b) Electrode faulty or dead
● c) Connection cable or connector damaged
● If you try to calibrate the offset at a pH value too different from 7.00, the
calibration is automatically ignored. Similarly, if you try to calibrate the gain
with a buffer solution at a pH too close to neutrality, the procedure will fail.
● During normal operation, it is possible to view the offset (pressing ⇓) and gain
(pressing ⇑) values to check the electrode status. The ideal values are an
offset close to zero and a gain close to 1.000. When these values are close to
the max/min limits (offset: -1.00pH ... +1.00pH; gain: 0.750 ... 1.500), the
electrode is contaminated or dead.
ORP Calibration
Rinse the electrode with distilled water, then immerse it in the calibration solution
(e.g. 220 mV).
1. Press the CAL key to enter the menu mode and use the ⇑ ⇓ keys to select the
option "IN2 CALIBRATION".
2. Press CAL again to confirm.
3. Press ⇓ to select the OFFSET calibration and confirm by pressing CAL.
4. The system automatically recognizes and displays the solution value (220
mV). If necessary, use the ⇑ ⇓ keys to adjust the calibration value.
5. Press CAL to confirm the calibration or ESC to quit the procedure and keep the
previous calibration.
Notes:
If the system does not automatically recognize the buffers or the "Calibration
Impossible" error occurs, it can be due to:
a) Calibration solution contaminated or expired
b) Electrode faulty or dead
● c) Connection cable or connector damaged
● During normal operation, it is possible to view the offset value by pressing ⇓ to
check the electrode status. The ideal offset value is close to zero. When this
value is close to the max/min limits (-100mV ... +100mV), the electrode is
contaminated or dead.
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