Hanna Instruments HI 2212 - Manual (Page 10)

10
3 cm
(1¼")
THREE-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 “
BUF
” tags will
appear and the “7.01” buffer will be displayed
on the secondary LCD.
• 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, the “READY” tag will be
displayed and the “CFM” tag will blink.
• Press CFM to confirm calibration.
• The calibrated value will be displayed on the
primary LCD and the second expected buffer value
on the secondary LCD.
• After the first calibration point is confirmed, submerse the pH electrode
and the temperature probe approximately 3 cm (1¼”) 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, the “READY” tag will be
displayed and the “CFM” tag will blink.
• Press CFM to confirm calibration.
• The calibrated value is then displayed on the
primary LCD and and the third expected buffer
value on the secondary LCD.
• After the second calibration point is confirmed,
submerse the pH electrode and the temperature
probe approximately 3 cm (1¼”) into the next 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.