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Manual PRO50-150 V.2
Insufficient flow in the sensor
holders or the chlorine sensor
is not in contact with the
water
Adjust the flow reaching the sensor
holders. Clean the filter and the flow
regulator of the sensor holders
There are air bubbles in the
measuring zone of the sensor
Bleed the sensor holder and ensure
that there is no air remaining in the
measuring zone.
The sensor has been a
number of hours measuring
the water without free
chlorine
Let water containing free chlorine
circulate through the sensor holders for
1 hour.
Reading below the
DPD-1 measurement
Insufficient flow in the sensor
holders
Adjust the flow reaching the sensor
holders. Clean the filter and the flow
regulator of the sensor holders.
There are air bubbles in the
measuring zone of the sensor
Bleed the sensor holders and ensure
that there is no air remaining in the
measuring zone.
Reading above the
DPD-1
The sensor has been
calibrated without waiting for
sufficient conditioning time
Repeat conditioning of the sensor and
recalibrate.
DP-! Reactives are worn
Repeat the DPD-1 measurement with
new reactives
Unstable reading
Failure in the connection of
the sensor with the controller
Check connections