10
f. The third point, the fourth point and the fifth point are the
same as the second point calibration. When the unit
completed the fifth point calibration, press the
“Mode”
key
and exit the calibration mode.
g. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the calibrated
buffers. After calibration, press and hold
“Mea./Eff.”
key for
about 5 seconds to display the new electrode efficiency and
offset value.
2. Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
a. Turn the unit on. In the pH mode, press
“Clear”
key for 5
seconds, all LCD elements will lit up. The meter clears all
calibration values stored in internal memory.
b. Connect the pH electrode to the BNC connector of the unit.
c. Press
“Mode”
key to go to pH-AUTOLOCK mode. “MAN”
icon, “pH” icon and “AUTO” icon will lit up. The "CAL" icon
will begin to flash.
d. Rinse the pH electrode in distilled water and immerse it in
the first buffer solution. Adjust the temperature reading to
that of the first buffer using the
“Up”
or
“Down”
keys (0.0
to 60.0
℃
). Then press and hold
“Stand/Cal”
key for 2
seconds to calibrate. The “WAIT” icon will flash until the
unit detects a stable reading. Once the unit calibrates the
first point. The selected buffer remains lit up while two other
selectable buffers start to flash. The unit is ready to be
sloped at the second buffer if the first buffer solution is 6.86
or 7.00 pH.
[
Note:
At this moment, press the
“Mode”
key, the unit will
exit the calibration mode. Single point calibration is
complete.
To continue with two or more point calibration, the first
buffer solution has to be either 7.00 or 6.86 pH.]
e. Repeat steps 5 of “
Calibration with an ATC/Temp probe in
the pH-AUTOLOCK mode”
for 2 to 5 points calibration.
f. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the calibrated
buffers. After calibration, press and hold
“Mea./Eff.”
key for
about 5 seconds to display the new electrode efficiency and
offset value.
