Fault Finding; Maintenance; Disposal - Grundfos Conex DIA-2Q Manual De Instrucciones

12. Fault finding

Faults during the measurement, see
Note installation and operating instructions of
the electrode or measuring cell.
Fault
1. No display following start-up.
2. With pH measurement:
Display permanently indicates
pH approximately 7.
– With measurement of oxidisers:
Display permanently indicates
zero.
– With redox measurement:
Display permanently indicates
approximately 0 mV.
3. Display permanently at full-scale
value.
4. Display with measured value
unsteady.
5. With measurement of oxidisers:
insufficient sensitivity of
measuring cell.
6. With pH and redox
measurement:
Display with measured value
reacts extremely slowly.
7. With pH and redox
measurement:
error message during
calibration.
8. Device cannot be set.
9. Faulty control.

13. Maintenance

The device is maintenance-free.
Repairs can only be carried out in the factory by
authorised personnel.
Cause
a) No power supply.
a) Short-circuit in cable between
measuring cell and
instrument amplifier, moisture
in connectors.
a) Open circuit in cable between
measuring cell and
instrument amplifier.
a) Interferences on cable from
electrode/measuring cell.
b) pH and redox measurement:
air in sample-water flow.
c) pH and redox measurement:
sample-water flow
interrupted.
d) Cable between
electrode/measuring cell and
instrument amplifier broken.
e) Sensor/electrode faulty.
a) Measuring cell contaminated
or passivated by deposits.
a) Electrode aged.
b) Electrode dirty.
a) Wrong buffer solution used.
b) Electrode aged.
c) Electrode dirty.
a) Incorrect code set (device
protected against
adjustment).
a) Device is incorrectly
parameterised.

14. Disposal

This product or parts of it must be disposed of in an
environmentally sound way. Use appropriate waste
collection services. If this is not possible, contact the
nearest Grundfos company or service workshop.
Remedy
Connect the power supply.
Check the connection cable and
eliminate short-circuit and
moisture.
Check the connection cable and
reestablish connection.
Check that the display is properly
connected.
Check the sample-water supply
system (pipes, etc.) and make
changes, if necessary.
Check the sample-water supply
system (pipes, etc.) and make
changes, if necessary.
Check the connection cable and
reestablish connection.
Replace the sensor/electrode.
Disassemble the measuring cell,
and clean the electrode surface.
Replace the electrode.
Clean the electrode.
Use the correct buffer solution.
Replace the electrode.
Clean the electrode.
See section 11.5.8 Code
Check the settings and match them
to the local conditions.
If necessary, reset the device to
the factory settings.
function.
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