Tabla de contenido
Publicidad
Idiomas disponibles
Idiomas disponibles
7 Troubleshooting
n
Users' qualifications: Trained user , see
Ä Chapter 1.2 "Users' qualifications "
on page 10
7.1 Troubleshooting
Error description:
Display on measuring device: 0.00 ppm
Sensor current: 0.00 mA
Measure/Remedy
1.
Check whether the measuring line is
connected with the right polarity
2.
Check measuring line for wire break
3.
Check function of controller / measuring
device using the simulator
4.
If no error has been localised by these
measures then
return the sensor for checking.
ð
Error description:
Display on measuring device: 0.00 ppm
3.00 mA < sensor current < 4.00 mA
Measure/Remedy
1.
Sensor not yet ready for measurement,
increase run-in time
2.
Check if there are substances in the
sample water (reducing agent such as,
e.g. sulphite) that disturb the sensor
3.
If no error has been localised by these
measures then
return the sensor for checking.
ð
Error description:
Display on measuring device frozen:
Sensor current above 20 mA
Measure/Remedy
1.
Determine the chlorine content of the
sample water using the DPD-1 reference
method
If it is really above the indicated
ð
measuring range of the of the sensor
then check the plant for faults. If the
reading is above the indicated meas‐
uring range of the sensor but this
concentration is desired then the
sensor must be replaced by a sensor
with the right measuring range
2.
If the measured DPD value is within the
measuring range of the sensor you must
check whether there are any troublesome
substances (e.g. ozone, chlorine
dioxide, di-/trichloramine) in the sample
water
If this is the case then you must
ð
remove the troublesome substances
from the sample water (e.g. by shock
chlorination).
3.
If there are no troublesome substances in
the sample water then there may be a
defect
Return the sensor for checking.
ð
Troubleshooting
25
Publicidad
Tabla de contenido
