Hanna Instruments HI 250 - Manual (Page 11)

11
• The “ ” tag will blink on the LCD until the reading is
stable.
• When the reading is stable and close to the selected buffer,
“READY” tag will be displayed and “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.
Note: The instruments will automatically skip the buffer used for the first point.
It also skips 6.86 if 7.01 buffer was used and viceversa. Likewise, it will
skip 9.18 if 10.01 buffer was used and viceversa.
• After the first calibration point is confirmed, immerse the pH electrode and
the temperature probe approximately 4 cm (1½”) 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 will be displayed on the primary LCD
and the third expected buffer value on the secondary LCD
line.
Note: The instruments will automatically skip the buffers used for the first and
second calibration points.
• After the second calibration point is confirmed, immerse the pH electrode
and the temperature probe approximately 4 cm (1½”) into the third
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 instruments store the calibration values and return
to normal measurement mode.
CAL
2 BUF
pH
BUFFER pH