7
5. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the third buffer solution (either 9.18/10.01 or
4.00/4.01). Allow temperature reading to stabilize, then press
“Slope” key to calibrate. The “WAIT” icon will flash until the
unit detects a stable reading. Once the unit calibrates the
third point and the unit will automatically exit the calibration
mode. Three points calibration is complete.
6. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the three
calibration buffers. After calibration, press and hold “Mea./Eff.”
key for about 5 seconds to display the new electrode
efficiency.
b.
Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
1. Turn the unit on. Press “Clear” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
stored in internal memory.
2. Connect the pH electrode to the BNC connector of the unit,
“MAN” icon will lit up. “pH” icon and “AUTO” icon lit up. The
“STAND” icon will flash.
3. Rinse the pH probes in distilled water and immerse it in the
first buffer solution (either 7.00 or 6.86). A
djust the temperature
reading to that of the first buffer using the
up
or
down
keys (0.0
to 60.0
℃
) before pressing “Stand” key. Then press and hold
“Stand” key for 5 seconds to calibrate. The “WAIT” icon will
flash until the unit detects a stable reading. Once the unit
calibrates the first point, the “SLOPE” icon will flash. The unit
is ready to be sloped at the second buffer. .
4. Rinse the pH probe in distilled water and immerse it in the
second buffer solution (either 4.00/4.01 or 9.18/10.01), then
press “Slope” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
second point, the “SLOPE” icon will 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.]
5. Rinse the pH probe in distilled water and immerse it in the
third buffer solution (either 9.18/10.01 or 4.00/4.01), then
press “Slope” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
third point and the unit will automatically exit the calibration
