- 8 -
7. pH Measurement
How to take pH measurements
Short press
to turn on the tester. Rinse the probe in distilled water,
shake off excess water. Insert the probe in your sample solution, make a
quick stir and hold still. Record the reading when it is stabilized (
appears and stays on screen).
Pure Water pH Measurement
When testing pure water like tap water, drinking water, RO water and
distilled water, it will take longer for the readings to get fully stabilized
(typically 1-5 minutes). Please be patient. If still not working, add Apera 3M KCL (AI1107) to your
pure water at the ratio of 1:1000 (e.g. 1 ml KCL to 1000 ml water) to accelerate stabilization while
minimizing pH change. If the accuracy is not meeting your requirement, please contact us at
[email protected] to find the specialized meter designed for pure water pH test.
8. Conductivity Calibration
How to calibrate
1)
Power on the tester. Press
key to switch to conductivity measurement mode (
Cond
). Rinse
the probe in distilled water and dry it.
2)
Pour certain amount of 1413μS/cm and 12.88mS/cm conductivity calibration solution into
corresponding calibration bottles (to about half volume of the bottle).
3)
Long press
key to enter calibration mode, (screen turns green).
4)
Dip the probe into 1413 μS/cm conductivity calibration solution, stir gently and hold still. When
the reading is fully stabilized (
stays on screen), short press
to start one-point
calibration, the tester returns to measurement mode and
will appear at the bottom left of
the screen, indicating a successful 1
st
point conductivity calibration.
5)
If needed (your target conductivity level is greater than 2 mS or 2000 μS), insert the probe into
the 12.88 mS conductivity calibration solution. Follow the steps in 8.1.3 to 8.1.4 to complete the
2
nd
point of calibration using the 12.88 mS standard solution.
will appear next to
,
indicating a successful 2-point conductivity calibration.
Conductivity Calibration Notes
The tester can calibrate 84μS, 1413 μS/cm and 12.88 mS/cm conductivity calibration solution. User
can conduct 1 to 3 points calibration. Refer to the table below. Usually calibrating the tester with
1413 μS/cm conductivity buffer solution alone shall meet the testing requirement.
