MS-9050 Series Manual — P/N 52413:F 10/22/2010 169
Read Status Operating Instructions
Chamber Value
The Chamber value should be within the indicated range for the following smoke detectors:
• SD350(T), SD355(T), D350P(R), D355P(R), SD300(T), AD350, and AD355 Addressable
Photoelectric Smoke Detectors: 405 - 2100 (obscuration of 1.00%/ft to 3.66%/ft.)
• CP350, CP355 and CP300 Addressable Ionization Smoke Detectors: 750 - 2100 (obscuration
of 0.50%/ft. to 1.44%/ft.)
If the addressable smoke detector’s Chamber reading is not within the acceptable range, clean the
detector and check the Chamber value again. If the reading is still not within the acceptable range,
immediately replace the detector.
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.
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:
DEVICE # DEVICE TYPE % DRIFT COMP CHAMBER TIME/DATE
1D001 SMOKE (PHOTO) 20 1281 12:01AM 01-08-2010
1D002 SMOKE (PHOTO) 20 1281 12:01AM 01-08-2010
1D003 SMOKE (PHOTO) 21 1259 12:01AM 01-08-2010
1D004 SMOKE (PHOTO) 20 1309 12:02AM 01-08-2010
1D005 SMOKE (PHOTO) 21 1281 12:02AM 01-08-2010
1D006 SMOKE (PHOTO) 20 1322 12:02AM 01-08-2010
1D007 SMOKE (PHOTO) 20 1280 12:02AM 01-08-2010
1D008 SMOKE (PHOTO) 20 1215 12:02AM 01-08-2010
1D009 SMOKE (PHOTO) 20 1310 12:02AM 01-08-2010
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
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