Electro-Chemical Devices (ECD) L20 - Manual (Page 10)

4. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either
4.00/4.01 or 9.18/10.01). Allow temperature reading to
stabilize, 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, to exit the calibration
mode. Dual point calibration is complete.]
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. Once the unit
calibrates the third point and the unit will automatically
exit the calibration mode. The three point 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.
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 light 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 light up. Press “Mode” key until “pH”
icon is on. The buffer set 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 5 seconds to calibrate.
Once the unit calibrates the first point, the selected buffer
remains lit up while the remaining two buffers start to
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),
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