Hanna Instruments HI 121 - Manual (Page 17)

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• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the primary
LCD and the secondary LCD will display the second
expected buffer value, together with “CAL”, “Cal
Point 2” and “7.01” tags and the corresponding
buffer tag blinking.
• After the first calibration point is confirmed, immerse the pH electrode and
the temperature probe approximately 4 cm (1½”) into the second buffer
solution and stir gently. The temperature probe should be close to the pH
electrode.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the
primary LCD and the secondary LCD will display the
third expected buffer value.
• After the second calibration point is confirmed, immerse the pH
electrode and the temperature probe approximately 4 cm (1½”) into
the third buffer solution and stir gently. The temperature probe should
be close to the pH electrode.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected
buffer, “CFM” tag blinks.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the
primary LCD and the secondary LCD will display the
fourth expected buffer value.
CFM
CFM
CFM