Hanna Instruments HI 2550 - Manual (Page 14)

14
3 cm
(1¼")
FIVE FIVE FIVE FIVE FIVE-----POINT POINT POINT POINT POINT CALIBRATION CALIBRATION CALIBRATION CALIBRATION 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 is then 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 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 third buffer solution and stir gently. The temperature probe
should be close to the pH electrode.