10
pH CALIBRATION
Calibrate the instrument often, especially if high accuracy is required.
The instrument should be recalibrated:
• Whenever the pH electrode is replaced.
• At least once a week.
• After testing aggressive chemicals.
PREPARATION
Pour small quantities of the buffer solutions into clean beakers. If
possible use plastic or glass beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two
beakers for each buffer solution: one for rinsing the electrode and one
for calibration.
If you are measuring in the acidic range, use pH7.01 or pH6.86 as
first buffer and pH4.01 as second buffer. If you are measuring in the
alkaline range, use pH7.01 or pH6.86 as first buffer and pH10.01 or
pH9.18 as second buffer.
PROCEDURE
A two-point calibration is recommended however a one-point
calibration will be permitted. Calibration can be performed using the
five memorized buffers:
• pH4.01, 6.86, 7.01, 9.18 and 10.01.
TWO-POINT CALIBRATION
• Submerse the pH electrode and the temperature
probe approximately 3 cm (1¼”) into a buffer
solution and stir gently. The temperature probe
should be close to the pH electrode.
• Press CAL. The “CAL” and “ ” messages will appear and
“7.01” buffer will be displayed on the secondary LCD.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” symbol will blink on the LCD until the reading is stable.
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