46
47
• Press
. If the instrument was calibrated before and calibration was not cleared, the old calibration
can be cleared by pressing
. After 10 seconds,
will be no longer available.
Note:
It is very important to clear calibration history when a new electrode is used because most errors
and warning messages that appear during calibration depend on calibration history.
• Immerse the pH electrode and the temperature probe approximately 4 cm (1
1
/
2
”)
into a buffer solution of your choice (pH 1.68, 3.00, 4.01, 6.86, 7.01, 9.18,
10.01, 12.45 or a custom buffer) and stir gently. The temperature probe should be
close to the pH electrode.
• Select the pH calibration buffer used with
or
. The “
Please wait...
”
message will appear on the LCD until the reading is stable or the buffer is validated.
• If the pH buffer is validated,
will appear on the LCD. Press
to update calibration. The
calibration buffer will be added to the Calibrated Buffers section.
• Immerse the pH electrode and the temperature probe into the next buffer solution and follow the above
procedure or press
to exit calibration.
pH Calibration screen description
Notes:
• The new added calibration point will replace an old
one if the difference between them is ±0.2 pH.
• If the existing stored calibration is full (five calibration
points), a pop-up menu will be displayed on the LCD
in which you can select with
or
keys the buffer you want to replace with the current
buffer. Press
to delete the selected buffer
and then press
to update calibration with the
new buffer.
• If using manual temperature, after selecting the
standard buffer, press
.
A pop-up menu will
be displayed on the LCD in which the temperature
value can be adjusted using
or
.
Press
to save the new temperature value.
• If using
Custom buffers
, press
after buffer
has been accepted to change actual buffer conditions.
A pop-up menu will be displayed on the LCD in which
the custom buffer and the temperature value (MTC)
can be adjusted by pressing
and then
or
keys. Press
to save the modified
value and then
/
to select next/previous
value to be adjusted.
• If the
Automatic buffer
entry type has been selected
for the calibration procedure, the instrument will
automatically select the closest buffer to the measured
pH value from the edit buffer group (see pH Setup for details).
• If the
Semiautomatic buffer
entry type has been selected for the calibration procedure, the
instrument will display only the closest buffers to the measured pH value from all the available
buffers and the user must select with
or
the buffer being used.
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