Hanna Instruments HI 255 User Manual
Page 13
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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 line.
Note: The instrument 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,
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 third expected buffer value on the secondary LCD
line.
Note: The instrument will automatically skip the buffer used for the first and
second calibration point.
_ 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,
READY tag will be displayed and CFM tag will blink.
•
Press CFM to confirm calibration.
The instrument stores the calibration value and returns
to normal measurement mode.
BUFFER pH
2
BUF
pH
CAL