ProMinent DULCOTEST OZE Mode D'emploi page 35

Fault Possible cause
Sensor cannot
Running-in period too low
be calibrated -
Diaphragm cap damaged
Reading
measuring/
control device
Interfering substances in water
larger than
(see "Cross-sensitivity" in
DPD-4
Chapter 15 "Technical data")
measurement
Short in the measuring line
Distance between diaphragm and
diaphragm cap too large
DPD chemicals past shelf life
Running-in period too low
Sensor cannot
be calibrated -
Deposits on the diaphragm cap
Reading
measuring/
control device
smaller than
Sample water flow rate too low
DPD-4
measurement
Air bubbles on the exterior of the
diaphragm
Interfering substances in the
sample water (surfactants, oils,
alcohol, corrosion inhibitors)
Surfactants in water (diaphragm is
transparent)
No electrolyte in diaphragm cap
Electrolyte displaced by gas
bubbles in sample water
ProMinent ®
Troubleshooting
Remedy
see Chapter 7.1 "Running-in period"
Replace diaphragm cap; run in
sensor, calibrate
Check water for interfering
substances and remedy
Locate short and remedy
Tighten diaphragm cap up to stop
Use new DPD chemicals,
repeat calibration
see Chapter 7.1 "Running-in period"
Remove deposits (see Chapter 9
"Maintenance"); replace diaphragm
cap; run-in sensor, calibrate
Adjust flow rate (see Chapter 15
"Technical data")
Remove air bubbles by tapping and
increase flow rate, if required
Contact ProMinent
Remove surfactants and replace
diaphragm cap; run-in sensor and
calibrate
Fill in new electrolyte
(see Chapter 5 "Assembly",
Chapter 7.1 "Running-in period"
and Chapter 7.2 "Calibration")
Contact ProMinent
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