User Manual

6
5 pH Measurement
5.1 How to take pH measurements
Short press to power on the tester. Rinse the probe in pure water,
shake off excess water. Dip the probe in your sample solution and make a
quick stir, then hold still. Record the reading after it is stabilized
( appears and stays on the screen).
5.2 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 [e-mail] to find the specialized meter designed for pure water pH test.
6 Probe Cleaning
6.1 The tester is only as accurate as the probe is clean. Always thoroughly rinse off the probe before and
after each measurement with pure water in a container or with a wash bottle.
6.2 For tough contaminants, detach the sensor shield, soak the probe in Apera probe cleaning solution
(AI1166) or detergent water for 30 minutes. Then use a soft brush to remove the contaminants.
Afterwards, soak the probe in 3M KCL soaking solution for at least 1 hour. Rinse it off, then re-
calibrate the tester before using again.
7 Probe Storage
7.1 Under regular usage (daily or weekly use), make sure the probe cap is wet, and tightly close the cap
with the O-ring.
7.2 For long-term storage (you are not going to use the product for a while), add 3M KCL soaking solution
to the Fill line in the probe cap and store the probe in it. Close on the probe cap tightly with the O-
ring.
7.3 If you find white crystals inside or outside the probe cap, it is perfectly normal. It is the 3M KCL
soaking solution that crystalizes over time by its nature. Just rinse them off and add in new soaking
solution. This chemical is not poisonous nor dangerous, and the probe’s performance will not be
affected at all.
7.4 NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could damage
the pH probe. Pure water is only for rinsing the probe.