Hanna Instruments HI 3512 - Manual (Page 20)

20
FIVE-POINT CALIBRATION FIVE-POINT CALIBRATION FIVE-POINT CALIBRATION FIVE-POINT CALIBRATION FIVE-POINT CALIBRATION
• Immerse the pH electrode and the temperature
probe approximately 3 cm (1¼”) into a buffer
solution of your choice (pH 1.68, 4.01, 6.86,
7.01, 9.18, 10.01, 12.45 or a custom buffer)
and stir the buffer gently. The temperature probe
should be close to the pH electrode.
• Enter pH calibration. The instrument will display the measured pH,
the LCD first expected buffer and the temperature reading.
• 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, Confirm
function key is displayed.
• Press Confirm to confirm first point.
• The calibrated value and the second expected buffer value is then
displayed on the LCD.
• After the first calibration point is confirmed, immerse the pH electrode
and the temperature probe approximately 3 cm (1¾”) 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.
3 cm