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9
pH CALIBRATION
It is recommended to calibrate the instrument frequently, especially if high accuracy is
required.
The pH calibration is also necessary in the following cases:
a) Whenever the pH electrode is replaced.
b) At least once a week.
c) After testing aggressive chemicals.
d) When extreme accuracy is required.
e) If “CALIBRATION EXPIRED” tag is blinking during measurement.
Every time you calibrate the instrument use fresh buffers and perform an electrode Cleaning
Procedure (see page 42).
PROCEDURE
PROCEDURE
PROCEDURE
PROCEDURE
PROCEDURE
One, two or three points calibration can be performed, from the 7 memorized buffers (1.68,
4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH).
• Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration
use two beakers for each buffer solution, the first one to rinse the electrode and the second
one for calibration.
• Remove the protective cap and rinse the electrode with some of the buffer solution to be
used for the first calibration point.
THREE-POINT CALIBRATION
THREE-POINT CALIBRATION
THREE-POINT CALIBRATION
THREE-POINT CALIBRATION
THREE-POINT CALIBRATION
• Immerse the pH electrode and the temperature probe approximately 4 cm (1½”) into a buffer
solution of your choice (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 or 12.45) and stir gently. The
temperature probe should be close to the pH electrode.
• Press the CAL key. The “CAL”, “1” and “CALIBRATION” tags will appear and the
secondary LCD will display buffer “7.01”.
