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ISE CALIBRATION (HI 5522 only)
Relative mV MEASUREMENTS
To measure the Relative mV of a sample:
• Press
then
(select Channel 1).
• Verify if a current calibration has been made.
• If required, conduct the single point Rel mV calibration.
Verify the tip of the electrode is immersed into the known
solution or ORP standard.
• Press
. Use
and
arrow keys set the
standard value. Press
to store the calibration.
• Press
then
(select Channel 1).
• Place calibrated sensor tip into the sample to be analyzed. The
instrument will display the measured Relative mV value on the
LCD, together with a short GLP information about the last
calibration or Offset: 0.0 mV no Rel mV calibration was
performed.
Notes:
If the ORP sensor is not in solution or the measured mV
potential is out of range, “
----
”
may be displayed on the
LCD.
For greater accuracy, it is recommended to calibrate the ISE sensors frequently. The instrument should be
recalibrated when “
ISE x Calibration Expired
” (the “
x
” represents channel “
1
” or channel ”
2
”) message
appears on the LCD, in the Reminder messages area.
Due to electrode conditioning time, the electrode must be kept immersed a few seconds to stabilize. The
user will be guided step by step during calibration with easy-to-follow messages on the display. This will
make the calibration a simple and error-free procedure.
PREPARATION
Pour small quantities of the standard solutions into clean beakers. If possible, use plastic beakers to
minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two beakers for each standard solution.
One for rinsing the electrode and one for calibration.
Note
: To read concentration (not activity)
ISA
must be added to the standards and samples. No corrections
are needed for dilutions.
CALIBRATION PROCEDURE
The ISE calibration and measurement can be performed with or without temperature compensation. If
temperature compensation option is enabled, the isopotential point of the electrode must be set in ISE Setup
in order to calculate the correct concentration measurement.
Before calibrating, make sure that the appropriate Electrode Type has been selected in ISE Setup according
to the measured Ion/compound.
ISE Calibration screen description
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