Operational Guide
26
When the reading is stable and close to the selected
buff er, the “CFM” tag will blink. Press
CFM
to confi rm
calibration.
After confi rming the fi rst calibration point, the
calibrated value will be displayed on the fi rst LCD line
and the second expected buff er value on the third LCD
line. (i.e. pH 4.01)
Rinse and submerse the pH electrode approximately
3 cm (1¼”) into the second buff er solution and stir
gently.
If necessary, press the ARROW keys to select a diff erent buff 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
buff er, the “CFM” tag will blink. Press
CFM
to confi rm calibration.
The calibrated value is then displayed on the fi rst LCD line and the third expected
buff er value on the third LCD line.
After the second calibration point is confi rmed, rinse and submerse the pH
electrode approximately 3 cm (1¼”) into the last buff er solution and stir gently.
If necessary, press the ARROW keys to select a diff erent buff 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 buff er, the “CFM” tag will
blink. Press
CFM
to confi rm calibration.
At the end of calibration the instrument displays “SAVING”, stores the calibration
value and returns to normal measurement mode.
The calibration sequence may be reduced to two buff er values or a single one.
Press
CAL
to return to measurement mode after the desired number of buff ers
have been calibrated.
Note
:
•
When performing a new calibration or adding to an existing calibration the
fi rst calibration point will be treated as an off set. See page 24 for details.
•
Press
CAL
after the fi rst or second calibration point are confi rmed and
the instrument will store the calibration data. Then it will return to
measurement mode.
•
If the value measured by the instrument is not close to the selected buff er,
“WRONG BUFFER” will blink. Check if the correct buff er has been used,
or clean the electrode by following the Cleaning Procedure. If necessary,
change the buff er or the electrode.
pH
Calibration
