7-29
pH, mV & ISE MODE
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:
For accurate measurements, add the appropriate ISA (Ionic Strength Adjustment) to
the calibration standards.
CALIBRATION PROCEDURE:
Before calibrating, make sure that the appropriate Electrode Type and concentration unit has
been selected in ISE Setup.
Up to a five point calibration is possible using any combination of five memorized standard
solutions and five custom solutions.
The ISE calibration and measurement can be performed with or without temperature
compensation. If the temperature compensation option is enabled, the isopotential point
of the electrode must be set in ISE Setup.
The current standard will be manually selected by the user from the available standards list.
The list of available standards depends of the Manual Entry setting.
To calibrate the instrument using Manual Entry:
• Press from the main screen. If the instrument was calibrated before and the
calibration was not cleared, the old calibration can be cleared by pressing .
• Immerse the Ion Selective Electrode and the temperature probe approximately 2 cm
into the lowest concentrated standard solution.
• Select the concentration with or .
• When the reading has stabilized, press to update the calibration. The calibration
point value will be added to the Calibrated Standard list.
• Select and repeat the procedure with all of the available standards.
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