Operational Guide
23
pH
Calibration
Rinse and submerse the pH electrode approximately 3 cm (1¼”) into the second
buffer solution and stir gently. If necessary, press the ARROW keys to select a
different buffer 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 buffer, “CFM” tag will blink.
Press
CFM
to confirm calibration.
Repeat procedure with additional pH buffers. A total of five pH buffers can be
utilized.
After confirming the last desired buffer calibration
points, press
CAL
(or if all five buffer values were
calibrated) the instrument will automatically display
“SAVING” as it stores information. It will then return to
normal measurement mode.
Each time a buffer is confirmed, the new calibration
data replaces the old data for the corresponding
buffer or for any buffer in the proximity of ±0.2 pH.
If current buffer has no previous data stored and the
calibration is not full (five buffers), the current buffer
is added to the existing calibration. If the existing
calibration is full, the instrument asks which buffer to
replace.
Press the
ARROW
keys to select another buffer to be replaced.
Press
CFM
to confirm the buffer that will be replaced.
Press
CAL
to leave calibration without replacing.
Note
: If the replaced buffer is outside the ±0.2 pH window of the calibrated
buffers, it is possible to select this buffer during the next calibration.
Working With Custom Buffers
If a custom buffer 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 buffer
value. The buffer value will start blinking.
Use the
ARROW
keys to change the buffer value.
After 5 seconds, the buffer value is updated. Press
u
if you want to change it again.
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