Cerlic pHX, Руководство пользователя, Страница: 9 / 24

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10. Maintenance
pHX / ReX sensors are easy to maintain. An electrode maintenance schedule should be
kept, listing when it is removed and cleaned. When this is done, the electrode should be
checked against a known buffer solution. If the control value does not match, a re-
calibration should be made.
Use distilled water for cleaning.
Regularly check that the mounting kit does not get damp or wet inside during cleaning
and other activities. Also check that the electrode is correctly mounted in its holder to
avoid leaking.
Error messages
Window text Problem Solution
Unknown buffer The smart calibration does not
recognize the current buffer
from the signal of the electrode
• Use standard buffers 4.00,
7.00, and 10.00.
•
Broken sensor, electronic
components, or cable
connection..
Same Buffer
During calibration the pHX does
not perceive a difference of
buffers.
• Make sure that you use two
different buffers during
calibration.
• The electrode may be broken.
• The electronic components in
the sensor may be broken.
Broken Electrode
Lightning or static discharges during thunder storms may cause damage to the electrode,
and could also damage the signal amplifier. The electrode is the most exposed point
since it is in direct contact with the water and, consequently, the ground connection for
a discharge.
Physical damage to the electrode usually makes measuring impossible. Make sure that
neither electrode nor cable is damaged.
Incorrect Measurements
Problem Solution
Dirty electrode
−
Clean with distilled water
Insufficient or poor reference solution
in the electrode
−
Refill/change reference solution (only
for refillable electrodes)
Change of "slope"due to age
−
Recalibration
- Re-activation (new reference
solution) only for refillable electrodes
Old electrode which gives slope <93%
−
Change electrode