Hanna Instruments HI 4211 - Manual (Page 50)

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• Add ISAB to the sample solution.
• Submerge the Ion Selective Electrode tip and the temperature
probe approximately 4 cm (1½”) into the sample to be
tested. Allow time for the electrode to stabilize.
• The measured concentration value will be displayed on the LCD. If
pressing , the “AutoHold” indicator will start blinking on
the LCD until the stability criterion is reached. The concentration
value will be frozen on the LCD, along with “AutoHold” indicator.
• To return to normal Measure mode press .
Note: If the reading is out of range, “-----” will be displayed
on the LCD.
KNOWN ADDITION
To measure the concentration of a sample using the Known
Addition incremental method:
• Press
and then to select ISE Measure mode
for the selected channel.
• Select the Known Addition method (see ISE Setup for details,
page 33).
• Press to start the measurement. The first step of the
method will be displayed on the LCD in which the user is notified
to add the appropriate ISA Buffer Volume (if different from 0 mL)
to the sample and to immerse the electrode into the Sample
Volume. The method parameters are also displayed on the LCD.
• Press to set the method parameters. Press /
to select next/previous parameter to be edit, then
press and use or to set the desired
parameter value. Press to save the modified value
and then press to exit method parameters edit menu.
• Make sure that the set parameters values are the used ones and
submerge the Ion Selective Electrode tip approximately 4 cm
(1½”) into the sample to be tested.
• Press to take the first mV reading.