Hanna Instruments HI 4521 - Manual (Page 44)

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Three buffer entry types are available: Automatic, Semiautomatic and Manual Selection. The default option is
Manual Selection.
To calibrate the instrument using Manual Selection buffer entry type:
• Press . If the instrument was calibrated before and calibration was not cleared, the old
calibration can be cleared by pressing . After 10 seconds, will no longer be available
from calibration screen.
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
(1½”) 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 used pH calibration buffer using 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 list.
• Immerse the pH electrode and the temperature probe into the next buffer solution and follow the above
procedure or press to exit calibration.
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.
• When in MTC mode, if pressing after entering
pH calibration and while a HANNA pH calibration buffer
with a x.xxx resolution is selected, 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.
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Set Reminder Period
Daily reminder - the user can set the time of day when the reminder is to appear.
Periodic reminder - the user can set the time from the last calibration (days, hours and minutes) after which the
reminder appears.
To set the reminder period:
• Use or to highlight the Set Reminder Period
option.
• Press and use / to select next /
previous entry to be edited.
• Press and use or to set the desired
value, then press to save the modified value.
• Press to return to the previous menu.
Calibration Reminder
This option allows the user to set the calibration reminder as
Daily,
Periodic or Disabled.
To set the calibration reminder:
• Use or to highlight the Calibration re-
minder option.
• Press to confirm your selection and then use
or to choose the desired option .
• Press to confirm your selection or press to
cancel operation.