8
To continue with two or more point calibration, the first
buffer solution has to be either 7.00 or 6.86 pH.]
e. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00 /
4.01 pH or 9.18 / 10.01 pH corresponding to the flashing
number on display). Allow temperature reading to stabilize,
then press
“Slope/Enter”
key to calibrate. The “WAIT”
icon will flash until the unit detects a stable reading. Once
the unit calibrates the second point, the selected two
buffers lit up and the remaining buffer starts to flash. The
unit is ready to be sloped at the third buffer.
[
Note:
At this moment, press the
“Mode”
key, the unit
will exit the calibration mode. Dual point calibration is
complete.]
f.
The procedure to calibrate the third point, the fourth point
and the fifth point are the same as the second calibration
point. When the unit completed the fifth point calibration,
press the
“Mode”
key and exit 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-AUTO LOCK mode.
a. Turn the unit on. In the pH mode, press
“Slope/Enter”
key
to save the selected buffer set. Press
“Set/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
begins to flash.
d. Rinse the pH probes 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”
key (0.0 to
60.0
℃
). Then press and hold
“Stand”
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
