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Fig. 2. Calibrating a pH electrode using the buffer solution
2-1 Electrode plug
2-2 Electrode handle
2-3 Electrode head
2-4 pH buffer solution
1. Insert the plug of a pH electrode into the BNC socket at the
top of the meter (callout 1-16 of Fig. 1).
2. Power on the meter by pressing the POWER button.
3. Using Step 15 of the setup procedure, manually adjust the
compensation temperature so it matches the temperature of
the buffer solution. Alternatively, use an ATC temperature
probe to make the adjustment automatically.
4. Holding the electrode by its handle, immerse it in the bottle of
buffer solution. (If you are using the ATC temperature probe,
immerse its head in the bottle as well.)
5. Gently shake the electrode (and the probe, if used).
The display will show the pH value.
6. Use two fingers to press the REC/ENTER and
HOLD/ESC buttons at the same time. When
this screen appears, release the buttons.
7. Press the M or L button until this screen appears. Press the REC/ENTER
button to calibrate the electrode for pH 7.
8. Press the M or L button again until this screen
appears. Press the REC/ENTER button to
calibrate the electrode for pH 4.
9. Press the M or L button again until this screen appears. Press the
REC/ENTER button to calibrate the electrode for pH 10.
10. The pH electrode has now been calibrated once. To maximize measurement accuracy,
General recommends rinsing the head of the electrode (and the head of the ATC
temperature probe, if used) in distilled water and then repeating the above steps at
least twice more.
11. To recalibrate the electrode in the future, you must clear the existing
settings. To do so, press the M or L button until this screen appears.
Then press the REC/ENTER button to clear the saved settings before
repeating the steps above to calibrate the electrode for pH 7, pH 4
and pH 10.
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