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3. pH Calibration
3.1. Before first use or unused for a long time, fill certain 3M KCl solution in the calibration bottle,
soak probe for at least 15 minutes. Pay attention that, soaking solution little higher that pH bulb
will be enough. Users can make this solution by themselves. Preparation: dissolve 25g KCl in 100
ml of pure water.
3.2. Rinse the probe in pure water and dry it.
3.3. Fill certain amount (about half volume of calibration bottle) of pH7.00 and
pH4.00 buffer solution in separate pH calibration bottles;
3.4. Long press
3.5. Dip the probe in pH7.00 buffer solution and stir gently, leave to Stabilize
(LCD displays
complete 1-point calibration. The tester then returns to measurement mode and calibration icon
appears on the LCD.
3.6. For multi-point calibration (either 2 or 3 point), rinse the probe in clean water and repeat
step 3.5 using 4.01pH and/or 10.01pH calibration solutions. After completion of each point, the
calibration icons
4. pH Measurement
Short press
to turn on the tester. Rinse the probe in pure water and dry it. Dip the probe in
sample solution, stir gently, leave it to stabilize. Get readings after LCD displays
5. Special Notes
5.1. Tester can perform 1~3points automatic calibration. But pH7.00 or pH6.86 buffer solution
must be used to make 1st point calibration. Then use other buffer solution to conduct 2nd or 3rd
point calibration. Tester will recognize 5 kinds of pH buffer solutions. Refer to the following chart:
Calibration
USA Series
1-point
7.00 pH
7.00 pH,
4.01 pH or 1.68pH
2-point
7.00 pH,
10.01pH or 12.45pH
7.00pH, 4.01 or 1.68pH,
3-point
10.01 or 12.45pH
to enter calibration mode; Short press
as shown in the picture on the right). Short press
(for 4.01pH) and
4.01 pH or 1.68pH
9.18 pH or 12.45pH
6.86pH, 4.01 or 1.68pH,
(for 10.01pH) will appear on the LCD near the
NIST Series
6.86 pH
6.86 pH,
6.86 pH,
9.18 or 12.45pH
to exit.
to
Indication icon
Diagram - 2
.
.
Recommended
Accuracy ≥ 0.1pH
Range: < 7.00pH
Range: > 7.00pH
Range: 0~14.00pH
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