Unstable reading
Manual PRO v.2
Failure in sealing of the
sensor
The pH of the water is lower
than at the time of calibration
The pH is lower than 6.5 and
therefore outside the
recommended reading zone
Failure in the connection of
the sensor with the controller
The water flow reaching the
sensor holders is unstable
and the flow regulator is not
operating.
There are air bubbles in the
measuring zone of the sensor
External electrical
interference
Interference from other
oxidizing agents
The pH is unstable
Check sealing rings of the sensor
Calibrate the sensor at the new pH
value
Adjust the pH to within the acceptable
pH margin
Check connections
Stabilize pressure in the piping where
samples are taken for the sensor
holders and check the flow regulator.
Bleed the sensor holder and ensure
that there is no air remaining in the
measuring zone.
Eliminate the source of disturbance. It
may be useful to connect water to an
earth connection.
Do not use more than one oxidizing
agent to disinfect the water.
Stabilize the pH.
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