AVL AVL DiCom 4000, Service Manual

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4000 Error Messages and Troubleshooting
Service Manual 2-3
2.1.4 Measuring Chamber Pressure Wrong
•
Check whether the measurement gas outlet is blocked.
•
If it is, remove blockage and acknowledge by pressing
>>
.
•
If you are unable to remedy the error, the measuring instruments unit must be
defective.
•
Remove the unit (see Dismantling the 4-/5-Gas Measuring Instruments Unit).
•
Check whether the hose system is blocked (with deposits or condensate; see Layout of
Pneumatics).
•
Check or replace the pressure sensor (see Pressure Sensor).
2.1.5 Leak Test Failed
•
If the tester fails its own leak test, check the entire sampling line for leaks from the tip
of the probe to the inlet on the rear panel of the tester.
•
If you find no leaks, disconnect the probe hose from the tester.
•
Connect a 2 m hose that is guaranteed leakproof to the inlet port of the tester, close it
off and carry out another leak test.
−
If the system passes the test, the leak must be in the probe/hose assembly.
−
If the system fails the leak test, check the O-rings in the filter housing and
condensate trap and check whether the connections for the probe hose and
condensate drainage hose are leaking. Replace the tester’s filter, including the
probe pre-filter.
−
If the system still fails the leak test, there must be a leak inside the system or the
pump is too weak.
•
Also check whether the tester has been stored with condensate in it at temperatures
below 0° C (leaks may be caused by ice).