5.5 pH parameters
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Calibrating the 3rd point
1
Remove the electrode from the buffer solution.
2
Rinse the electrode with distilled water.
3
Immerse the electrode in the pH 9.00 buffer solution.
The WAIT FOR STABILITY message appears on the display and the
symbol flashes.
NOTE
When changing from an acidic pH value to an alkaline pH value, it
may take a few seconds longer to achieve stability.
4
As soon as buffer 9.00 is detected and the symbol appears, press
the button.
The measured value will appear on the display and briefly after that,
the 2nd slope.
The symbol will appear next to the and symbols. The
symbol means that the 949 pH Meter is calibrated in the alkaline
range.
After completing the 3rd calibration point, the 949 pH Meter automat-
ically returns to measuring mode.
￭ For a 1-point calibration, press the
button after completing the 1st
calibration point.
￭ For a 2-point calibration, press the button after completing the 2st
calibration point.
NOTE
The calibration of the electrodes is important for the quality and true-
ness of the measurement. Check that the buffers used are new and
uncontaminated, and are at the same temperature.
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