BSV BSsalt-10 Manuel De L'utilisateur page 91

Reading above the
DPD-1
Manual EVO v.3
There are air bubbles in the
measuring zone of the sensor
Sensor passivated for
working at more than 3 mg/l
The pH of the water is higher
than at the time of calibration
The pH is above 9, and
therefore outside the
recommended reading zone,
The sensor has been
calibrated without waiting for
sufficient conditioning time
DP-! Reactives are worn
DPD-1 measurement is
incorrect owing to a sample
of water with high salinity
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
Bleed the sensor holders and ensure
that there is no air remaining in the
measuring zone.
Clean the sensor by submerging it in
an HC10.1M solution for 20 seconds.
Calibrate the sensor to the new pH
value.
Adjust the pH within the acceptable pH
range: 6.5-9
Repeat conditioning of the sensor and
recalibrate.
Repeat the DPD-1 measurement with
new reactives
Increase the waiting time in the
reaction of the DPD measurement
reactives.
Check sealing rings of the sensor
Calibrate the sensor at the new pH
value
Adjust the pH to within the acceptable
pH margin
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