Hanna Instruments Edge Instruction Manual page 31

The custom buffers allow the user to calibrate in a buffer solution different
from a standard one. Two custom buffers can be set in SETUP menu. See page
30 for more information about using custom buffers.
The instrument will automatically skip the buffer used during calibration
and the buffers which are in a ±0.2 pH window, around one of the calibrated
buffers.
Submerse the pH electrode approximately 3 cm (1¼") into a buffer solution
and stir gently. Press CAL to enter calibration.
The "CAL" tag will appear and the "7.01" buffer will
be displayed on the 3rd LCD line. If necessary, press
the ARROW keys to select a different buffer value.
The " " along with "STIR" tag will be displayed and
"WAIT" will blink on the LCD until the reading is
stable.
When the reading is stable and close to the selected
buffer, "CFM" tag will blink. Press CFM to confirm
calibration.
The calibrated value will be displayed on the 1st LCD
line and the second expected buffer value on the 3rd
LCD line.
After the first calibration point is confirmed, rinse and submerse the pH
electrode approximately 3 cm (1¼") into the second buffer solution and stir
gently. If necessary, press the ARROW keys to select a different buffer value.
pH
Calibration
Operational Guide
31