Electro-Chemical Devices (ECD) L20 - Manual (Page 9)

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),
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, to 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 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 an ATC/Temp probe 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 and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will light up. “pH” icon is on. The buffer set icon
will flash.
3. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution (either 7.00 or
6.86). Allow temperature reading to stabilize, 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.
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