The meter must be recalibrated in the following situations:
(a) New probe, or probe that is unused for a long period of time
(b) After measuring acids (pH<2) or alkaline solutions (pH>12)
(c) After measuring a solution that contains fluoride or a concentrated organic solution
Due calibration
Pre-set calibration interval (begin from the date of last calibration) to
remind due calibration in a preset period per parameter P1.2 (DC)
During due calibration, Er 7 in red color appears on LCD.
The meter can’t continue operation and Er 7 icon disappears until
the calibration is done, or when select No per parameter P1.2.
Note: If DHS electrode is link, due data calibration is refer to DHS last calibration (is possible to check when
DHS is activated or in P1.3 parameter setting -next paragraph-)
Check calibration date
Check the date and time of last calibration to decide whether new calibration is needed. Please refer to parameter
setting P1.3. If DHS electrode is link last calibration date is refer to DHS last calibration.
pH Meter Calibration
Press key to enter into the calibration mode (the display get blue color), “CAL 1” blinks at the top right of
LCD and “7.00 pH ”blinks at the bottom right of LCD, indicating using pH 7.00 buffer solution to make the 1st
point calibration.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH 7.00 buffer solution. Stir the solution
gently and leave it in the buffer solution until a stable reading is reached. The meter’s display will show scanning
and locking process of calibration buffer solution at the bottom right of LCD.
Er 2 displays if press key before the value is stable.
When the meter locks 7.00 pH, stable icon displays on LCD. Press key to calibrate the meter.
“End” icon appears after calibration is done. After the 1st point calibration, the meter’s display will show at the
top right a blinking CAL2, and show at the bottom right blinking 4.00pH and 10.01pH alternately, indicating using
pH4.00 or pH10.01 buffer solution to make the 2nd point calibration.
Take out pH electrode，rinse it in pure water, allow it to dry, and submerge it in pH4.00 buffer solution.
Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached. The meter’s
display will show scanning and locking process of calibration buffer solution at the bottom right of LCD. When the
meter locks 4.00 pH, stability icon displays on LCD. Press key to calibrate the meter.
Display shows “End” and slope.
The meter’s display will show at the top right a blinking CAL3, and show at the bottom right blinking 10.01pH,
indicating using pH10.01 buffer solution to make the 3rd point calibration.
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