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5. Rinse the electrode with distilled water and then immerse it in the pH 4.01 (or
9.01) buffer solution.
6. Wait a few seconds for the system stabilization.
7. Press and hold the [+] key until the message "GAI" (GAIN calibration) is
displayed.
8. Press ON/OFF to confirm the calibration or wait a few seconds to exit without
saving and keeping the previous calibration.
Notes
If trying to perform an OFFSET calibration at a pH value very far from 7.00 or a GAIN
calibration with a buffer solution of pH too close to neutrality, the procedure will not
be successful and the display will show the "Err" message. During normal operation,
you can see the offset (by pressing [-]) and gain (by pressing [+]) values to check the
status of the electrode. 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), it means that the electrode is contaminated or dead.
ORP Calibration
1. Rinse the redox electrode with distilled water and then immerse it in the
calibration solution (220 mV).
2. Wait a few seconds for the system stabilization.
3. Press and hold the [-] key until the message "OFS" (OFFSET calibration) is
displayed.
4. Press ON/OFF to confirm the calibration or wait a few seconds to exit without
saving and keeping the previous calibration.
Notes
The ORP calibration is a single-point procedure (offset). However, pressing the [+]
key, the system enters the GAIN calibration, but this will not have any effect. During
normal operation, you can see the offset value (by pressing [-]) to check the status of
the electrode. The ideal value is an offset close to zero. When this value is too close
to the max/min limits (-100mV ... +100mV), it means that the electrode is
contaminated or dead.
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