VAF instruments OILCON MARK 6M, Техническое руководство

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15.3.2 Path dirty alarm
Probable causes Action
1
Windows of detector cell dirty 
Operate the window wash pump a few times by
pressing [WINDOW WASH] during the flush cycle.
This should clean the windows sufficiently to cancel the
alarm.
If the alarm persists it is necessary to clean the windows in
the measurement cell manually as described in section 9.1.
2
Excessive oil in detector cell,
“Zero Error” alarm also activated 
Check the sample outlet of the monitor.

Flush the monitor again till the “Zero Error” alarms
clears.
It is advisable to let the monitor complete the flush cycle
each time. This will give the maximum amount of flushing.
3
Transmitter error

Check the cables from the measurement cell to the
junction box on the skid.

Check the cables from the junction box on skid to the
EPU terminal strip.
If the alarm persists, then it is likely that the cell is faulty
and will require replacement.

Also consult section 15.4.5