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DEVICE #
1D009
Chamber Value
The Chamber value should be within the indicated range for the following smoke detectors:
•
NP-100(R), NP-200(R), FSP-851(T/R), FSP-951(T/R), ND-100(R), and FSD-751(R)PL Addressable Photoelectric Smoke
Detectors: 405 - 2100 (obscuration of 1.00%/ft to 3.66%/ft.)
•
FSI-851 and NI-100 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 address-
able 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 perfor-
mance. 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
Figure 4.1 illustrates a graphic representation of the maintenance levels:
PRINT
1=DETECTOR DATA
2=COMM SETTINGS
3=EXIT PRINTING
Print Screen #2
NFW-50X Manual — P/N LS10129-001NF-E:C 7/25/2018
DEVICE TYPE
% DRIFT COMP
SMOKE (PHOTO)
FACP Status Displays:
INVREP
DIRTY1
DIRTY2
Table 4.1 Maintenance Alert Levels
Maintenance
Urgent
Acceptable
Low Chamber
Reading
Figure 4.1 Diagram of Maintenance Levels
Pressing 2 while viewing Print Screen #2 allows the user to print the Communicator's settings. Refer to
"Communicator" on page 77 for additional information on the display.
Pressing 3 while viewing Print Screen #2 exits the user from the print menu.
CHAMBER
20
1310
A hardware problem in the detector
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
Dust accumulation above the allowed limit.
DIRTY
Maintenance
Alert
Range
LOW
VALUE
Operating Instructions
TIME/DATE
12:02 AM 01-08-2016
Indicates:
115
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