Notifier AFP-300 Manual

Also see for AFP-300: Operation manual Installation manual Programming manual Product installation guide Programming manual

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DN-5262 • 10/31/05 — Page 5 of 10 Maintenance Warnings. When the drift compensationperformed for a detector reaches a certain level, the performanceof the detector may be compromised, and special warnings aregiven. There are three warning levels: (1) Low Chamber value,usually indicative of a hardware problem in the detector; (2)Maintenance Alert, indicative of dust accumulation that is nearbut below the allowed limit; (3) Maintenance Urgent, indicativeof dust accumulation above the allowed limit. The MaintenanceAlert level allows maintenance before the performance of thedevice is compromised. Sensitivity Adjust. Nine sensitivity levels are provided foralarm detection. These levels can be set manually, or canchange automatically between day and night. Nine levels of pre-alarm sensitivity can also be selected, based on predeterminedlevels of alarm. Pre-alarm operation can be latching or self-restoring, and can be used to activate special control functionsthat are a subset of the alarm control program. Self-Optimizing Pre-Alarm. Each detector may be setfor “Self-Optimizing” pre-alarm. In this special mode, the detec-tor “learns” its normal environment, measuring the peak analogreadings over a long period of time, and setting the pre-alarmlevel just above these normal peaks. This allows extremelysensitive pre-alarm capability with reasonable protection againstnon-fire signals. Cooperating Multi-Detector Sensing. A feature ofintelligent sensing is the ability of a smoke sensor to considerreadings from nearby sensors in making alarm or pre-alarmdecisions. Using logic algorithms, each sensor can include upto two other sensors in its decision. Without statistical sacrificein the ability to resist false alarms, it allows a sensor to increaseits sensitivity to actual smoke by a factor of almost 2 to 1. Multi-detector sensing also allows the combination of ionization withphotoelectric technology in reaching an alarm decision.Intelligent SensingIntelligent Sensing is a set of software algorithms that provide the AFP-300/400 with industry-leading smokedetection capability. The development of these sophisticated algorithms are made possible by the close coop-eration between Notifier and System Sensor, the world leaders in fire detection and alarm technology. Thesecomplex algorithms require many calculations on each reading of each detector, and are made possible by thevery high speed microcomputer used by the AFP-300/400 (16-bit RISC Reduced Instruction Set Computer). Drift Compensation and Smoothing. These al-gorithms (U.S. patent pending) identify and compensatefor long-term changes in the analog readings from eachsmoke sensor. Long-term changes are usually causedby dust accumulation inside the smoke chamber. Driftcompensation allows the detector to retain its originalability to detect actual smoke, and resist false alarms,even as dirt accumulates. It reduces maintenance re-quirements by allowing the system to automatically per-form the periodic sensitivity measurements required byNFPA. Smoothing filters are also provided by software toremove transient noise signals, usually caused by elec-trical interference. Different smoothing algorithms areused, depending on the sensitivity selection of each de-tector.Normal Threshold5262aw5.wmfAwacs4.wmfAwacs2.wmfAwacs1.wmf