Chapter 7 Troubleshooting
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Chapter 7 Troubleshooting
The user must read this manual carefully before installation and use, and should
operate the instrument correctly according to the content of this manual to confirm
whether the installation and use environment meets the requirements. The
following table shows the possible failures of the pH / ORP controller. Users can
troubleshoot the problems according to the symptoms.
Common malfunctions
Method of exclusion
Signal data is displayed
incorrectly or is
displayed “——”
Wiring error: please check if the input signal cable
is connected correctly
Over range: The measured value is out of range.
No display at the
controller
？
Check if the power supply is correctly connected.
Fluctuation of the
displayed value?
Check if there are frequency converters and other
interference equipment at the surrounding
environment, notice to keep away from this
interference equipment or adopt shield measures.
The pH instrument can’t
be calibrated
？
The standard solution preparation is not correct or
the electrode is damaged.
The test of standard
solution pH4.00, pH6.86
and pH9.18 calibration is
not correct?
If the standard solution is contaminated, exchange
the standard solution for calibration again.
The response of the
figure is slow?
The electrode physical bulb is covered by dirt, the
response will become slow, please clean according
to the corresponding methods based on the types
of the pollutants, it’s normal phenomenon if it’s slow
in winter.