8
b.
Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
1. Turn the unit on. Press “CLEAR” key for 5 seconds, all LCD
elements will lit up. The meter clears all calibration values
stored in the internal memory.
2. Connect the pH electrode to the BNC connector of the unit,
“MAN” icon will lit up. “pH” icon and “AUTO” icon will 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). Adjust 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 2 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 and the unit will automatically exit the calibration
mode. Dual point calibration is complete.
5. The unit calculates and compensates for the pH electrode
SLOPE deviation corresponding to the values of the two
calibration buffers. After calibration, press and hold
“MEA./EFF.” key for 5 seconds to display the new electrode
efficiency.
[
Note:
It is recommended to use a new electrode when the
efficiency value is over than 75%.]
c.
Calibration with an ATC/Temp probe in the pH NON-
AUTOLOCK mode.
1. Turn the unit on. Press “CLEAR” key for 5 seconds, all LCD
elements will lit up. The meter clears all calibration values
stored in the internal memory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will lit up. “pH” icon is on. The “STAND” icon will
flash.
