11
Trouble
Reason
How to fix
Reading is always
slowly changing,
won’t stabilize
Contaminated probe
Use a soft brush to clean the probe with Apera probe
cleaning solution or detergent water.
Clogged junction
Use a soft brush to clean the probe with Apera probe
cleaning solution or detergent water, then soak it in
Apera 3M KCL soaking solution overnight.
Aged probe
Replace the probe.
Testing pure water pH like
tap/drinking/RO/distilled water
Be patient, wait for 1-5 minutes to reach a fully
stabilized reading. If still not stabilizing, add Apera 3M
KCL solution to test water at 1:1000 ratio.
Display similar
readings in any
solutions or always
display 7.0 pH
Broken probe
If you don’t find any visible damage of the probe,
contact us for warranty fulfillment; If there is visible
damage, replace the probe.
Instrument defect
Contact us for warranty fulfillment.
Reading keeps
jumping
Probe is not fully submerged
in the solution
Make sure the probe is fully immersed in the solution at
least 1 inch.
Air bubbles around the sensor
shield
Make a quick stir in the solution to remove air bubbles.
Probe is not properly
connected, or the pin
connector is broken.
Check the
probe’s connector, make sure it’s not broken
and is correctly connected. Align the probe and
instrument correctly before plugging in. Never force it.
Ensure that the probe connector is not exposed to air
too long.
Calibration is
successful, but
reading is not
accurate
Aged probe
Replace the probe.
Air bubbles around the sensor
shield
Make a quick stir in the solution to remove air bubbles.
Clogged junction
Clean the probe with probe cleaning solution, then soak
it in 3M KCL soaking solution overnight.
Comparison with other
testers, test strips, or drop
tests
To compare accuracy with other testers, make sure to
perform calibration for all testers in the same standard,
then test another standard. Whichever gives more
accurate reading is the more accurate one. Test strips
or drop tests’ accuracy in not comparable to pH meters‘.
Poor quality standard
solutions
Replace with fresh and clean standard calibration
solutions made by legitimate scientific instrument
manufacturers.
The probe is not suitable for
your application.
Contact us to find the most appropriate product for your
specific application.
16.
Warranty
We warrant this instrument to be free from defects in material and workmanship and agree to repair
or replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned
or damaged product attributable to responsibility of APERA INSTRUMENTS (Europe) GmbH for a
period of TWO YEARS (SIX MONTHS for the probe) from the delivery.
This limited warranty does NOT cover any damages due to:
Accidental damage, transportation, storage, improper use, failure to follow the product instructions
or to perform any preventive maintenance, unauthorized repair or modifications, normal wear and
tear, or other external causes or actions beyond our reasonable control.
APERA INSTRUMENTS (Europe) GmbH
Wilhelm-Muthmann-Straße 18, 42329 Wuppertal, Germany