6
Chart - 3 pH standard buffer solution series
pH standard buffer solution series
4.2.2. Three-point calibration
The instrument can perform 1-3 points calibration. The first point calibration must use 7.00 pH (or 6.86 pH)
standard solution, then select other standard solution to perform the second and the third point calibration.
See chart – 4.
Chart - 4 Three-point calibration mode
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4.2.3. Calibration frequency
Calibration frequency depends on the sample, the electrode performance, and the required accuracy. For
high accuracy measurements (≤ ±0.03pH), the meter should be calibrated immediately before taking a
measurement. For general accuracy (≥±0.1pH), the meter can be calibrated and used for approximately
one week before the next calibration.
The meter must be recalibrated in the following situations:
(a) New probe or probe that has not been used for a long time
(b) After measuring acid (pH<2) or alkaline solutions (pH>12)
(c) After measuring a solution that contains fluoride or a concentrated organic solution
(d) If the solution’s temperature differs greatly from the calibration solution temperature.
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