9
d.
Calibration with manual temperature compensation in the
pH NON-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. Press “Mode” key until “pH” icon is on.
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. 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. 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. 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.
[
Note:
For accurate measurements, it is recommended that pH
calibration is preformed once a week and after replacing the
electrode.]
