AVL AVL DiCom 4000, Service Manual

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4000 Error Messages and Troubleshooting
Service Manual 2-5
2.2 Opacity Measuring Chamber
2.2.1 Measuring Chamber Too Hot/Too Cold
If the error message "Measuring chamber too hot" occurs during operation, remove the
probe from the exhaust pipe and wait until the temperature returns to the permitted
range. Acknowledge the message by pressing
>>
.
If the error message "Measuring chamber too cold" is displayed, the chamber has been
cooled by cold exhaust gas. Wait until the measuring chamber has heated up again to at
least 80° C and acknowledge the message by pressing
>>
.
If the measuring chamber temperature does not return to the permitted range after
several attempts (2 to 3 times), there must be a fault.
•
If the temperature is still too low, one of the heating blocks has probably failed (see
Operating Manual - Heating Function Test or section 6.6 Heating Blocks and Orifice
Plates) or a temperature sensor has failed (see section 6.8 Temperature Sensor).
•
If the temperature is still too high, the feedback control system is malfunctioning (see
section. 4.2.1 Main Board). But check the temperature sensor as well, just in case.
2.2.2 Changeover Valve Error
This message suggests failure of the changeover valve in the opacity measuring chamber.
•
Replace changeover valve.
Do not lubricate the changeover valve.