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11. Troubleshooting
Please also refer to sensor documentation for additional troubleshooting guidelines.
Fault
Cause
Remedy
No water discharge
Inlet valve closed
Open inlet valve complete
Inlet strainer blocked
Unscrew cover of inlet strainer and clean the sieve
Flow detector or flow restrictor are
blocked
Clean flow detector or flow restrictor or replace complete part.
Water running from the
sampling point
Sampling point not correctly closed
Close outlet fitting of sampling point
Power supply LED is off
No power supply
Connect power supply
Displayed system time is not
current or is not updated
every second
• Internal clock not adjusted
• Not updated every second
• Adjust clock in menu Setup
• Restart CU 382
Error messages or error
symbol displayed?
Sensor communicates an error
Go to Parameter settings / Monitor and check status (see
sensor manual for status information)
Tubes or connections are
leaking
Fittings are not tight
Try to tighten fittings. Be careful when using heavy tools for
tightening. Tubes, fittings and flow cell can be destroyed if too
much force is used!
Flow detector shows no flow
• Inlet valve is closed
• Inlet strainer is blocked
• Open inlet valve
• Clean inlet strainer
Water is not visible within the
tubes
• Inlet valve is closed
• Inlet strainer is blocked
• Open inlet valve
• Clean inlet strainer
Water is not visible within the
tubes
If pressure on the inlet is very high, air
can come out after the flow restrictor
Reduce pressure on inlet
Parameter readings are
fluctuating
• Measuring electrode is contaminated
or faulty
• Inlet strainer is blocked
• Air bubbles inside flow cell
• Exchange electrolyte or membrane cap (see sensor
manual for more information)
• Clean inlet strainer
• Reduce pressure in inlet
Parameter reading are not
plausibly
• Measuring electrode is contaminated
or faulty
• Inlet strainer is blocked
• Air bubbles inside flow cell
• Exchange electrolyte or membrane cap (see sensor
manual for more information)
• Clean inlet strainer
• Reduce pressure in inlet
Readings are not within the
specified and calibrated
measuring range
• Sensor / DID was powered on recently
• Concentration of measurement
substance is to high
• It may take up to an hour before a sensor provides correct
values
• Changing to sensor with a wider measurement range
