Chamber Value; Drift Compensation; Maintenance Alert - Fire-Lite MS-9200UDLS Manual

Read Status
DEVICE # DEVICE TYPE
1D001 SMOKE (PHOTO)
1D002 SMOKE (PHOTO)
1D003 SMOKE (PHOTO)
1D004 SMOKE (PHOTO)
1D005 SMOKE (PHOTO)
1D006 SMOKE (PHOTO)
1D007 SMOKE (PHOTO)
1D008 SMOKE (PHOTO)
1D009 SMOKE (PHOTO)

Chamber Value

The Chamber value should be within the indicated range for the following smoke detectors:
• SD355, SD350(T) D350P(R) and SD300(T) Addressable Photoelectric Smoke Detectors: 405
- 2100 (obscuration of 1.00%/ft to 3.66%/ft.)
• CP355, CP350, 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
compensation performs the following functions:
• Samples photoelectric smoke detectors every 6 seconds and ionization smoke detectors 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
electrical 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:
Maintenance Level:
Low Chamber Value
Maintenance Alert
Maintenance Urgent
MS-9200UDLS Series Manual — P/N 52750:H 4/14/2014
% DRIFT COMP
20
20
21
20
21
20
20
20
20
FACP Status Displays: Indicates:
INVREP
A hardware problem in the detector
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
DIRTY2
Dust accumulation above the allowed limit.
Table 4.1 Maintenance Alert Levels
CHAMBER TIME/DATE
1281 12:01 AM 01-08-2001
1281 12:01 AM 01-08-2001
1259 12:01 AM 01-08-2001
1309 12:02 AM 01-08-2001
1281 12:02 AM 01-08-2001
1322 12:02 AM 01-08-2001
1280 12:02 AM 01-08-2001
1215 12:02 AM 01-08-2001
1310 12:02 AM 01-08-2001
Operating Instructions
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