ProMinent DULCOTEST CLO 1 Manual Del Operacion página 28

Troubleshooting
Error description:
Sensor display >> DPD 1 value,
No calibration possible (gradient too high)
Measure/Remedy
1. Check whether there is additional
oxidising agent (e.g ozone, chlorine
dioxide, or chloramines) in the sample
water
Remove them. If this is not possible
ð
then contact ProMinent.
2. Check the age of your DPD chemicals
If there is doubt, repeat the DPD
ð
measurement with new chemicals
and then re-calibrate.
3. When directly connecting the sensor to
external devices (e.g. PLC), make sure
that the sensor is galvanically isolated
from all other devices/consumers
Always use a separating transformer
ð
for the supply.
4. Foreign (stray) potentials on the water
(e.g. due to defective rotary pump)
5. If the reason for this disturbance cannot
be determined we recommend you clean
the sensor as described in
on page 31 .
28
Error description:
Sensor display fluctuates
Measure/Remedy
1.
2.
3.
4.
Ä
Fluctuation due to system
Repeat the DPD measurement at short
intervals and thereby exclude that the
sensor fluctuations are not caused by the
system.
Check that there is a constant flow rate at
the sensor of at least 30 l/h .
Make sure that there is a sufficient mixing
distance after metering the chlorine .
If necessary, install a static mixer.
ð
When directly connecting the sensor to
external devices (e.g. PLC), make sure
that the sensor is galvanically isolated
from all other devices/consumers
Always use a separating transformer
ð
for the supply.
Foreign (stray) potentials on the water
(e.g. due to defective rotary pump)