Hanna Instruments HI 2550 - Manual (Page 15)

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• 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
fourth expected buffer value on the secondary LCD.
• After the third calibration point is confirmed, submerse the pH electrode
and the temperature probe approximately 3 cm (1¼”) into the fourth
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
fifth expected buffer value on the secondary LCD.
• After the fourth calibration point is confirmed, submerse the pH
electrode and the temperature probe approximately 3 cm (1¼”) into
the fifth 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 the fifth calibration point.
• The instrument stores the calibration value and returns to normal
measurement mode.
FOUR, THREE OR TWO-POINT CALIBRATION FOUR, THREE OR TWO-POINT CALIBRATION FOUR, THREE OR TWO-POINT CALIBRATION FOUR, THREE OR TWO-POINT CALIBRATION FOUR, THREE OR TWO-POINT CALIBRATION
• Proceed as described in “FIVE-POINT CALIBRATION” section.
• Press CAL after the fourth, third or second calibration point was
confirmed. The instruments will memorize the calibration data and
return to measurement mode.