Operational Guide 23
pH
Calibration
Rinse and submerse the pH electrode approximately 3 cm (1¼”) into the second
bu er solution and stir gently. If necessary, press the ARROW keys to select a
di erent bu er value.
The “
” along with “STIR” tag will be displayed and “WAIT” will blink on the LCD
until the reading is stable.
When the reading is stable and close to the selected bu er, “CFM” tag will blink.
Press CFM to con rm calibration.
Repeat procedure with additional pH bu ers. A total of ve pH bu ers can be
utilized.
After con rming the last desired bu er calibration
points, press CAL (or if all ve bu er values were
calibrated) the instrument will automatically display
“SAVING” as it stores information. It will then return to
normal measurement mode.
Each time a bu er is con rmed, the new calibration
data replaces the old data for the corresponding
bu er or for any bu er in the proximity of ±0.2 pH.
If current bu er has no previous data stored and the
calibration is not full ( ve bu ers), the current bu er
is added to the existing calibration. If the existing
calibration is full, the instrument asks which bu er to
replace.
Press the ARROW keys to select another bu er to be replaced.
Press CFM to con rm the bu er that will be replaced.
Press CAL to leave calibration without replacing.
Note: If the replaced bu er is outside the ±0.2 pH window of the calibrated
bu ers, it is possible to select this bu er during the next calibration.
Working With Custom Bu ers
If a custom bu er was set in SETUP menu, it can be selected during calibration
by pressing the ARROW keys. The “C1” or “C2” tag will be displayed once selected.
Press u if you want to modify the custom bu er
value. The bu er value will start blinking.
Use the ARROW keys to change the bu er value. After
5 seconds, the bu er value is updated. Press u if you
want to change it again.
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