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14. Probe Replacement
pH probes don’t last forever. Every probe will eventually age and fail even if you don't use it that often.
The typical service life of Apera probes is 12-24 months depending on the frequency of usage and
how well you keep it clean and properly stored. We recommend replacing your probe every 1 to 2
years to ensure the best performance
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.
The replacement probes that are compatible with PH60S-Z are:
•
PH60S-DE (Spear pH probe for solids/semi-solids pH testing),
PH60-DE (Regular pH glass bulb probe), PH60F-DE (Flat pH
probe for surface pH testing),
•
ORP60-DA (ORP Probe).
15. Troubleshooting Guide
Trouble
Reason
How to fix
Cannot
calibrate
Pressing
too soon
Wait for
to stay on screen before pressing
Incorrect standard
solutions
Reboot tester, calibrate pH 7 first, then pH 4. For details
refer to Section 5.2 (a).
Poor quality standard
solutions
Replace with fresh and clean standard calibration
solutions made by legitimate scientific instrument
manufacturers.
Contaminated probe
Clean the probe with Apera cleaning solution or
detergent water.
Aged probe
Replace the probe.
Dried-out probe
Soak the probe in 3M KCL solution for at least 15
minutes.
Probe is not fully
submerged in the solution
Make sure the probe is fully immersed in the
solution at least 1 inch deep.
Air bubbles around the
sensor
Make a quick stir in the solution to remove air
bubbles.
Reading is
always slowly
changing, won’t
stabilize
Contaminated probe
Clean the probe with
Aprea’s cleaning solution or
detergent water.
Clogged junction
Clean the probe with Aprea’s cleaning solution, then
soak it in 3M KCL soaking solution overnight.
Aged probe
Replace the probe.
Testing pH of low iconic
strength solutions like tap
water, drinking water, RO
water
Be patient, wait for 1-5 minutes to reach a fully
stabilized reading. If still not stabilizing, add 1ml of
3M KCL solution to 1000ml of test solution (or 1
teaspoon to 1 gallon).
