6
OPERATIONAL PROCEDURES
A. Buffer Set Selection
The pH6810 meter has two buffer sets: 7.00, 4.01, 10.01pH and
6.86, 4.00, 9.18pH. The meter is factory pre-set at 7.00, 4.01 and
10.01pH.
To change the buffer set, turn off the unit, then press and hold the
“Stand” key while turning on the unit again.
[Note: There is no need to repeat this procedure every time the unit is
power up unless one decides to change the buffer settings.]
B. pH Calibration
The pH6810 uses 2-point or 3-point calibration. The first point must
be 6.86/7.00, and the second point can either be 4.00/4.01 or 9.18
/ 10.01 .
a. Calibration with an ATC/Temp probe 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 and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will lit up. “pH” icon and “AUTO” icon lit up. The
“STAND” 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. 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 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. 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.]
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