Hanna Instruments HI 9828 User Manual
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4.2 pH CALIBRATION
Calibrate the meter often, especially if high accuracy is required.
Selecting pH calibration the display shows two op-
tions: “Calibrate pH” and “Clear old calibration”.
If “Calibrate pH” is selected, it is possible to per-
form a new calibration at 1, 2 or 3 points with
standard buffers (pH 4.01, 6.86 or 7.01, 9.18 or
10.01) or a single calibration with custom buffer.
If “Clear old calibration” is selected, all calibration data will be deleted and the
default data restored.
NO
NO
NO
NO
NOTES
TES
TES
TES
TES Old calibration data have to deleted every time the pH electrode is
replaced and after a cleaning procedure.
When a 3-point calibration is performed, all the old data are overwrit-
ten, while with a 1 or 2-point calibration procedure the meter will use
the previous data stored with the last 3-point calibration for the missing
points.
4.2.1 Preparation
Pour small quantities of selected buffer solutions into clean beakers. If possible,
use plastic beaker to minimize EMC interferences. To minimize cross contamina-
tion, use two beakers for each buffer solution: the first one for rinsing the elec-
trode and the second one for calibration.
4.2.2 Procedure
The current measured value is shown on the pri-
mary display and the buffer value is displayed in
the secondary one.
Press the BUFFER softkey to change the buffer
value or insert a custom buffer.
1, 2 or 3-point calibration
• Immerse the probe into the selected buffer and
stir gently. The current pH value, the buffer
value and “Not ready” are displayed.
• When the reading is stable and close to the
selected buffer value, the display shows
“Ready”.