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7.3 How to take pH measurements
Short press to power on the tester. Rinse the probe in pure water, shake off excess water. Insert the probe in your
sample solution or solid sample, and hold still. Record the reading when it is stabilized( stays on screen).
7.4 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.
ORP Meas ur ement
1) ORP stands for Oxidation-Reduction Potential, measured in mV. It’s also called redox. ORP is a measure of the
cleanliness of water & its ability to break down contaminants. A separate ORP probe (ORP60-DA) needs to be
installed to be able to measure ORP.
2) Power on the tester, unscrew the original probe, and install the ORP60-DA probe, then the tester will automatically
switch to ORP measurement mode (Refer to Section 15 for how to replace a probe).
3) Rinse the probe in distilled water and dry it. Dip the probe in sample solution, shake for a few seconds, and hold still.
Record the ORP reading after appears and stays on screen.
Probe Cl eaning
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.
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.
P rob e St or ag e
1) Always store the spear probe in the 3M KCL soaking solution when not in use. Never let it dry out.
Replace the soaking solution if it gets contaminated.
2) NEVER store the probe in pure water like tap, RO, distilled, or deionized water as they could damage the pH probe.
If this happens, immediately soak the pH probe Apera 3M KCL soaking solution overnight, then re-calibrate it before
using. Pure water is only for rinsing the probe.
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