6-30
Model 3090/3090AK Engine Exhaust Particle Sizer
TM
Spectrometer
Error flags in Table 6-3 indicate
fatal errors
occurred and the associated
data points
cannot
be used. The data points show zero (0) in a graph, but
the actual data values are saved in the file. Exported data points for a given
time period are set to exactly zero to indicate the invalidity of the data
points.
Table 6-2
Non-Fatal Error Flags
Error
Code Error Message
Suggested Action
0
Sheath Flow Rate Too Low
Check state of Flows in the instrument’s User Settings Window
or view the Instrument Status window in the EEPS software.
The sheath flow filters may be loaded. Try replacing the filters.
1
Sheath Flow Rate Too High
Check that flowmeter connector did not come loose during
shipping, or has a loose connection.
Disconnect the instrument from any external air flow. The
sheath pump may be off, but the flow is being forced through
the flowmeter by an external source.
2
Sample Flow Rate Too Low
Check state of Flows in the instrument’s User Settings Window
or view the Instrument Status window in the EEPS software.
Disconnect the instrument from any external flow
—the external
source may be at a high vacuum and the pump cannot
maintain the correct flow. If the flow is still low, the filters
before or after the sample pump may be clogged. Try
replacing the filters.
3
Sample Flow Rate Too High
Disconnect the instrument from any external air flow. The
sample pump may be off, but the flow is being forced through
the flowmeter by an external source.
4
Charger Flow Rate Too Low
Check state of Flows in the instrument’s User Settings Window
or view the Instrument Status window in the EEPS software.
Check that flowmeter connector did not come loose during
shipping.
The charger flow is not actively controlled. The flow may have
drifted for a number of reasons. Adjust the flow to the correct
value using the charger flow valve (shown in Figure 6-8).
5
Charger Flow Rate Too High
6
Extraction Flow Rate Too Low
Check state of Flows in the instrument’s User Settings Window
or view the Instrument Status window in the EEPS software.
The filter in front of the extraction pump may be clogged. Try
replacing it
—see above. The extraction pump uses a brush
motor with a limited life. If the filter is new and the pump
cannot maintain the correct flow, the pump should be
replaced
—see above.
7
Extraction Flow Rate Too High
Check that flowmeter connector did not come loose during
shipping.
Disconnect the instrument from any external air flow. The
extraction pump may be off, but the flow is being forced
through the flowmeter by an external source.
