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12. Probe Replacement
12.1 Every pH probe gradually loses its sensitivity and will eventually fail. A typical service life of a pH
probe is 1-2 years depending on many factors such as frequency of use, nature of test samples,
and how well it is maintained, etc. Apera Instruments recommends replacing the pH probe every 1
to 2 years to guarantee the optimal performance.
12.2 How to replace a probe
1) Take off the probe cap
2) Screw off the probe ring
3) Unplug the probe
4) Plug in the new replacement probe (pay attention to the
probe’s position);
5) Screw on the probe ring tightly. Soak the probe in 3M KCL for
5-15 minutes. Then perform calibration before testing.
12.3 Replacement probes compatible with PH60S Tester
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AI1205 PH60S-E (spear pH probe for soft-solid samples)
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AI1203 PH60F-E (flat pH probe for surface test)
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AI1201 PH60-E (regular pH probe for general water solutions)
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AI3711-E PH60-DE (double-junction pH probe for general water solutions)
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AI3713-E PH60S-DE (double-junction spear pH probe for soft-solid samples)
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AI802G GS2-E (spear pH probe for soil direct test)
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AI1207 ORP60-E (ORP probe)
13. Notes
a) Avoid testing in very high (>113°F) or very low (<41°F) temperature solutions as it will cause
greater measurement error and potential damage to the probe. Test your samples and perform
calibration close to room temperature as much as possible.
b) Never use your finger to touch the glass membrane or use other material to rub it. Doing so could
generate static electricity and cause measurement errors. Never test oily liquids.
c) Make sure the battery cap is completely closed with the red O-ring. Otherwise, the waterproof
rating could be compromised.
