11
3. Calibration with an ATC/Temp probe in the pH NON-
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 and the
ATC/Temp probe to the ATC/Temp connector of the unit.
c. Press
“Mode”
key for the LCD to display pH and the
AUTOLOCK annunciator is off. “ATC” icon will lit up, “pH”
icon is on. The "CAL" icon will begin to flash.
d. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution. Allow temperature
reading to stabilize. Then press and hold
“Stand/Cal”
key
for 2 seconds to calibrate, the unit immediately 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. Rinse the pH and ATC/Temp probes 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
unit immediately calibrates the second point. The selected
two buffers lit up and the remaining buffers start 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 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
