3) For pH Calibration buffer solutions, we recommend that users replace new buffer solution after 10 to 15 times
of use to keep the standard buffer’s accuracy. Do NOT pour the used calibration solutions back into the solution
bottles in case of contamination.
4) When calibrating strong basic solutions (pH>10), use 7.00 pH and 12.45 pH to calibrate; When measuring
strong acidic solutions (pH<4), 7.00 pH and 1.68 pH should be calibrated.
5) For the self-diagnosis information, please refer to the table below:
Self-Diagnosis information
Potential problems and how to fix
The pH calibration solution cannot be
recognized by the meter.
1. Make sure the probe is fully immersed in the
calibration solution.
2. Check if calibration solution is expired or polluted.
3. 1st point of pH calibration must be pH 7.00 or 6.86.
See 6.2 (1).
4. Please check whether pH electrode is damaged or
broken. If so, please replace with a new one.
5. The glass bulb or junction is severely contaminated.
Please use a soft brush with soap water to clean it
thoroughly. Then soak it in 3M KCL 3-5 hours before
performing calibration again.
6. If none of the above, please contact us at
info@aperainst.com or +1 (614) 285-3080
Is pressed before measurement is
fully stable
Wait for to come up and stay on screen before pressing
During calibration, readings being unstable
for over 3 minutes
1. Please check whether pH electrode is damaged or
broken. If so, please replace with a new one.
2. The glass bulb or junction is severely contaminated.
Please use a soft brush with soap water to clean it
thoroughly. Then soak it in 3M KCL overnight before
performing calibration again.
3. The electrode is aged (used for over a year and has a
much slower response). A replacement is needed.
4. If none of the above, please contact us at
info@aperainst.com or +1 (614) 285-3080
pH electrode zero electric potential out of
range (<-60mV or >60mV)
1. Check whether pH buffer solutions comply with the
USA or NIST standard.
2. Check whether pH buffers are expired or
contaminated.
3. Please check whether pH electrode is damaged or
broken. If so, please replace with a new one.
4. The electrode is aged (used for over a year and has a
much slower response). A replacement is needed.
5. The electrode is invalidated (Er4/Er5 repetitively
appears, and problems 1, 2, 3 are excluded). A
replacement is needed.
6. If none of the above, please contact us at
info@aperainst.com or +1 (614) 285-3080
pH electrode slope out of range
(<85% or >110%)
The calibration reminder is triggered. It’s
time to perform a new pH calibration
Perform pH calibration or cancel calibration reminder in ZenTest
settings.
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