Notifier NFS-640 Programming Manual

AWACS Features Appendix C: AWACS™ Applications
NFS-640 Programming Manual P/N 51333:B 10/03/2003 87
Cooperative Multi-Detector Sensing
Cooperative Multi-Detector Sensing is the ability of a smoke detector to consider readings from nearby
detectors in making alarm or pre-alarm decisions. Each detector can include up to two other detectors in
its decision. Without statistical sacrifice in the ability to resist false alarms, Cooperative Multi-Detector
Sensing allows a detector to increase its sensitivity to actual smoke by a factor of almost 2 to 1.
Cooperative Multi-Detector Sensing also allows the combination of ionization with photoelectric
technology in reaching an alarm decision. The figure below shows a graph representing Cooperative
Multi-Detector Sensing:
Figure 28 Cooperative Multi-Detector Sensing
SMOKE OBSCURATION
Time (minutes)
Alarm
Combined
3 Sensors
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Notifier NFS-640 Specifications

General

Humidity	10% to 93% non-condensing
Power Supply	120/240 VAC, 50/60 Hz
Display	80-character LCD
Operating Temperature	0°C to 49°C (32°F to 120°F)
NAC Outputs	4
Power	24 VDC
Communication	RS-485
Weight	Approx. 15 lbs (without batteries)