Operating Instructions
170 MS-9050UD PN 52413:C 01/23/08
Maintenance Alert
The software determines when the drift compensation for a detector reaches an unacceptable level
that can compromise detector performance. When a detector reaches an unacceptable level, the
control panel indicates a maintenance alert. Table 4.1 summarizes the three levels of maintenance
alert:
Figure 4.1 illustrates a graphic representation of the maintenance levels:
4.22.15 Time-Date
The operator can view the daylight savings time and the month and week when daylight savings
time will begin and end. Pressing 3 while viewing Read Status Screen #5 will display the following
screens:
Maintenance Level FACP Status Displays Indicates
Low Chamber Value INVREP A hardware problem in the detector
Maintenance Alert DIRTY1 Dust accumulation that is near but below the
allowed limit. DIRTY 1 indicates the need for
maintenance before the performance of the detector
is compromised
Maintenance Urgent DIRTY2 Dust accumulation above the allowed limit.
Table 4.1 Maintenance Alert Levels
Figure 4.1 Diagram of Maintenance Levels
DIRTY
Acceptable
Range
Maintenance
Urgent
Maintenance
Alert
Low Chamber
Reading
LOW
VA L U E
READ STATUS
1=SERVICE TERMINAL
2=PRINT
3=TIME-DATE
Read Status Screen #5
DAYLIGHT SAVINGS
ENABLED YES
START MONTH MAR
START WEEK WEEK 2
DAYLIGHT SAVINGS
END MONTH NOV
END WEEK WEEK 1
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