39
Three-point Calibration
• Proceed as described above but do not
quit calibration by pressing CAL.
Note
The meter will automatically skip the two buffers that were
used to prevent errors.
• After the second calibration point is
confirmed, immerse the pH electrode
and the Potential Matching Pin into the
third buffer solution (e.g. pH10.01) and
stir gently.
Note
The electrode should be submerged ap-
proximately 4 cm (1½”) in the solution.
The temperature probe should be located
as close as possible to the pH electrode.
• Only when the reading is stable the
probe indicator “ “ will stop flashing
(after about 30 seconds) and the “CFM”
indicator will start blinking.
• Press CFM to confirm the calibration; if the reading is
close to the selected buffer, the meter stores the reading,
adjusting the 2
nd
slope point and the calibration process
is ended with the offset and the 1
st
and 2
nd
slope of the
meter calibrated.
If the reading is not close to the
selected buffer, “WRONG “ will
blink.
Note
During calibration, the secondary LCD displays the selected
buffer value. By pressing LCD the temperature can be dis-
played. This will allow you to check the buffer temperature
during calibration.
