Hanna Instruments HI 4221 - Manual (Page 48)

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• If the standard solution concentration is validated, will appear on the LCD. Press to update
calibration. The calibration point value will be added to the Calibrated Standards section.
• The “Please wait...” message will appear on the LCD until the reading is stable and 10 seconds elapsed,
time in which 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 calibra-
tion 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. Press
to delete the selected
calibrated point and then press to update cali-
bration with the new standard solution.
• If the isopotential point of the electrode is unknown, the
ion calibration and measurements can be performed only
without temperature compensation (see ISE Setup, Tem-
perature option for details, page 33). When the temperature
compensation option is disabled, at least a two-point
calibration must be performed in order to perform ISE
measurements. Otherwise, “-----” will appear on the LCD.
• When in MTC mode, if pressing after enter-
ing ISE calibration and while a standard solution is
selected, a pop-up menu will be displayed on the LCD
in which the concentration and the temperature value
can be ajusted by pressing
and then
or keys. Press to save the modified
value and then / to select next/
previous value to be adjusted.
CALIBRATION MESSAGES
• Wrong standard solution. Please check the standard solution: this message appears when the
difference between the ppm reading and the value of the selected standard solution concentration (ppm)
is significant. If this message is displayed, check if you have selected the appropriate calibration standard.