Instrument Operation 5-31
Diagnostics
The diagnostics screen shows a variety of measurements monitored on-
board the classifier, many of which trigger warning or error conditions if
limits are exceeded. Table 5-6 contains a brief description of each
diagnostic. Values outside the acceptable range are displayed in either red
or yellow on the instrument screen. See the Error Messages section of this
chapter for acceptable ranges.
Figure 5-17
Electrostatic Classifier Diagnostics Screen
Table 5-6
Electrostatic Classifier Diagnostic Screen
Actual current supplied to DMA center rod.
Actual voltage on DMA center rod.
Setpoint of voltage on DMA center rod.
Sheath flow rate measured by internal flowmeter.
Percent of maximum allowable sheath current (3A).
Temperature of sheath flow measured by internal
flowmeter.
Relative Humidity of sheath flow measured immediately
upstream of Sheath + port.
Time in hours that sheath flow blower has been on.
Barometric pressure of sheath flow, measured internally.
Current drawn by sheath flow blower.
Aerosol inlet flow as measured at inlet. Shows zero if no
impactor is installed.
Delta pressured measured at inlet. Should be nearly zero if
no impactor is installed.
Number of hours a 3088 neutralizer has been ionizing.
Shows 0 if no 3088 is installed.
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