10
TWO-POINT CALIBRATION
TWO-POINT CALIBRATION
TWO-POINT CALIBRATION
TWO-POINT CALIBRATION
TWO-POINT CALIBRATION
For most applications it is recommended that pH 7.01 or 6.86 buffers be
used as the first calibration point and pH 3.00 (for acidic samples) or pH
9.18/10.01 (for alkaline samples) as the second calibration point.
Note:
The pH 12.45 buffer is not for general measurement; use only if
the sample is very alkaline to avoid sodium error.
• Submerse the pH electrode and the temperature probe approximately
3 cm (1¼”) into a buffer solution and stir gently. The temperature
probe should be close to the pH electrode.
• Press the
CAL
key. “
CAL
” and “
pH
” tags will be on, and the
“
CLEAR CAL if new electrode
” tag will blink.
• Press the
CLR
key if you are using a new electrode or want to clear
the calibration history. The instrument will display the “
donE
”
message for a few seconds.
• Press the
CAL
key, or wait a few seconds to continue.
It is very important to clear the calibration history when a new electrode
is used because all error and warning messages that appear during
calibration depend on the calibration history.
Note:
• The “
CLEAR CAL if new electrode
” will only appear if the
instrument has been previously calibrated.
• The “
CAL
”, “
pH
” and “
BUFFER
” tags will appear and the
“
7.01
” buffer will be displayed on the secondary LCD.
• Press the
ARROW
keys to select a different buffer value, if
necessary.
• The “ ” tag will blink until the reading has stabilized.
CLEAR CAL if new electrode
pH
CAL
