AFP-300/AFP-400 Programming PN 50259:C1 06/19/97 33
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AWACS™ (Advanced Warning Addressable Combustion Sensing) is a set of software
algorithms that provide the AFP-300/AFP-400 with industry-leading smoke detection
capability. The development of these sophisticated algorithms are made possible by the
close cooperation between Notifier and System Sensor, the world leaders in fire
detection and alarm technology. These complex algorithms require many calculations
on each reading of each detector, and are made possible by the very high speed
microcomputer used by the AFP-300/AFP-400. Appendix C covers the following
topics:
Table 35 AWACS Topics
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AWACS features include the following:
• Drift Compensation and Smoothing
• Maintenance Warnings
• Sensitivity Adjust
• Self-optimizing Pre-Alarm
• Cooperating Multi-Detector Sensing
• Pre-Alarm
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Drift compensation uses algorithms (U.S. patent pending) that identify and compensate
for long-term changes in the analog readings from each smoke sensor. (Typically, dirt
and dust accumulation inside the smoke chamber causes long-term changes in detector
readings.) Drift compensation does the following:
• Allows a detector to retain its original ability to detect actual smoke, and resist
false alarms, even as dirt and dust accumulates.
• Reduces maintenance requirements by allowing the control panel to automatically
perform the periodic sensitivity measurements required by NFPA Standard 72.
AFP-300/AFP-400 software also provides smoothing filters to remove transient noise
signals, usually caused by electrical interference. Different smoothing algorithms are
used, depending on the sensitivity selection of each detector. Refer to “Detector
Sensitivity Settings” on page 39 for more information on detector sensitivity levels.
Topic Refer to Page...
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– Descriptions of AWACS features, such as Drift
Compensation, Sensitivity Adjust, and so on.
33
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– Alert and Action settings, programming
38
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– Pre-Alarm and Alarm sensitivity
settings for photo, ion, laser, and multisensor detectors.
39
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– Instructions for viewing and
printing detector maintenance information.
41
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