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Make sure the instrument and ISE sensor have been calibrated before making ISE measurements.
When using one of the incremental methods for measurement, at least a two point ISE calibration
must be performed to establish the electrode slope.
For accurate measurements, add the appropriate ISA (Ionic Strength Adjuster) to both samples and
standards. Consult ISE manual for sensor preparation details.
DIRECT MEASUREMENT
To measure the concentration of a sample using the Direct
reading mode:
• Press
and then to select ISE Measure
mode for the selected channel.
• Select the Direct reading mode (see ISE Setup for
details).
• Add ISA to the sample solution.
• Submerge the Ion Selective Electrode tip and the
temperature probe approximately 2 cm (1”) into the
sample. Allow time for the electrode to stabilize.
• The measured concentration value will be displayed on
the LCD in the selected units.
Note: If the reading is out of range, “----” will be displayed on the LCD.
DIRECT/AUTOHOLD MEASUREMENT
To measure the concentration of a sample using the
Direct/AutoHold reading mode:
• Press
and then to select ISE Measure
mode for the selected channel.
• Select the Direct/AutoHold reading mode (see ISE Setup
for details).
• Add ISA to the sample solution.
• Dip the Ion Selective Electrode tip and the temperature
probe approximately 2 cm (1”) into the sample to be
tested.
• The measured concentration value will be displayed on the LCD. Press
, the “AutoHold”
indicator will blink on the LCD until the stability criterion is reached. The concentration value will
be frozen on the LCD, along with “AutoHold” indicator.
ISE MEASUREMENT (HI5222 only)
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