Troubleshooting - ProMinent DULCOTEST CDP 1 1-mA-2 ppm Mode D'emploi

8
Fault Possible cause
The sensor
Run-in period too short
cannot be
Membrane cap damaged
calibrated -
measuring
Interference from water
device/
contaminants (see 15 "Technical
controller
Data", "Cross-Sensitivity")
display value is
Short circuit in signal cable
greater than
DPD-1
Outdated DPD chemicals
measurement
The sensor Run-in period too short
cannot be
Membrane cap deposits
calibrated -
measuring
device/
Sample water flow inadequate
controller
display value is
Air bubbles on the outside of the
smaller than
membrane
DPD-1
measurement
Reference electrode spent (shiny
patches appearing)
No electrolyte in membrane cap
Electrolyte is penetrating sample
water via gas bubbles
Measured
Interference from water
variable value
contaminant (see 15 "Technical
is "zero"
Data", "Cross-Sensitivity")
ClO
measuring range limit
Sensor incorrectly connected to
controller
Air bubbles on the outside of the
Measured
membrane
variable display
unstable
Membrane damaged
Cause lies with the controller
ProMinent ®

Troubleshooting

content below the lower
2
Troubleshooting
Remedy
See 7.1 "Run-in period"
Replace membrane cap. Run-in
sensor, calibrate
Identify interfering contaminant and
implement remedy
Identify short circuit and repair
Use new DPD chemicals, repeat
calibration
See 7.1 "Run-in period"
Remove deposits (see 9
"Servicing"). Replace membrane
cap. Run-in sensor, calibrate
Increase flow (see 15 "Technical
Data")
Tap to remove air bubbles and
increase flow if necessary
Return sensor to ProMinent
Add new electrolyte (see 5
"Assembly", 7.1 "Run-in Period"
and 7.2 "Calibration")
Discuss with ProMinent
Identify contaminant and replace
water if necessary
Add ClO and then repeat
2
calibration or use appropriate
sensor
Connect sensor correctly to
controller
Tap to remove air bubbles and
increase flow if necessary
Replace membrane cap. Run-in
sensor, calibrate
Identify cause and remedy
27