MS-9600LS Series Manual — P/N 52646:B8 11/20/2015 145
Read Status Operating Instructions
Figure 4.1 illustrates a graphic representation of the maintenance levels:
Drift Compensation
Drift compensation uses software algorithms that identify and compensate for long-term changes in
the data readings from each addressable smoke detector. These long-term changes in detector data
readings are typically caused by dirt and dust accumulation inside the smoke chamber. Drift com-
pensation performs the following functions:
• Samples each photoelectric smoke detector every 6 seconds and each ionization smoke
detector every 3 seconds
• Allows a smoke detector to retain its original ability to detect actual smoke and resist false
alarms, even as dirt and dust accumulate
• Reduces maintenance requirements by allowing the control panel to automatically perform the
periodic sensitivity measurements required by NFPA Standard 72
The FACP software also provides filters to remove transient noise signals, usually caused by elec-
trical interference.
4.23.16 Time-Date
The operator can view the daylight savings time and the month and week when daylight savings
time will begin and end. Pressing 1 while viewing Read Status Screen #6 will display the following
screens:
Maintenance Urgent
DIRTY2
Dust accumulation above the allowed limit.
Table 4.1 Maintenance Alert Levels
Figure 4.1 Diagram of Maintenance Levels
DIRTY
Functional
Range
Maintenance Urgent
Maintenance Alert
Low Chamber Reading
LOW
VALUE
Recommended
Range
READ STATUS
1=TIME-DATE
Read Status Screen #6
DAYLIGHT SAVINGS
ENABLED YES
START MONTH MAR
START WEEK WEEK-2
DAYLIGHT SAVINGS
END MONTH NOV
END WEEK WEEK-1
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