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The group of calibration standards is set under ISE Setup
→
Calibration. Select standards that are
in the measurement range of the samples.
To calibrate the instrument:
• 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.
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.
• Add ISA to both standard solutions and samples.
• Immerse the Ion Selective Electrode and the temperature probe
approximately 2 cm (1”) into the less concentrated standard solution
and stir gently.
• Select the appropriate standard solution concentration with
or
. For
All Standards
manual entry mode, the standard
concentration can be selected from a list containing all the predefined and
custom standards. For
Group Standard
manual entry mode the standard
concentration can be selected from the predefined group of standards.
Press
to calibrate the electrode in the standard.
Note: To adjust standard value: Press
. A pop-up menu will be displayed on the LCD
in which the concentration value can be adjusted using
or
. Press
to save the new concentration value.
• The “Please wait
...
” message will appear on the LCD for 10 seconds. Remove ISE from first
standard, rinse tip and immerse the Ion selective electrode and the temperature probe into the
next standard 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 less than
20 % of the standard solution.
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
the standard solution you want to replace with the
current one.
2
cm
(1”)
ISE CALIBRA
TION (HI5222 only)
