C.2.3: Self-Optimizing Pre-Alarm; C.2.4: Detector Sensitivity - Honeywell Notifier NFS2-640/E Programming Manual

Features
C.2.3 Self-Optimizing Pre-Alarm
You can set each detector, except Heat, for Self-Optimizing Pre-Alarm (PA=1). In this Self-
Optimizing mode, the software measures the normal peak analog readings and sets the Pre-Alarm
level just above these normal peaks. This allows extremely sensitive Pre-Alarm capability with
reasonable protection against non-fire signals. The figure below shows a graphical representation
of the Self-Optimizing Pre-Alarm level:
Analog
Reading
For more information on setting Pre-Alarm levels, refer to "Changing Detector Sensitivity" on
page 54
C.2.4 Detector Sensitivity
The control panel provides nine Sensitivity Levels for alarm detection and pre-alarm as follows:
NOTE: For a list of all detector sensitivity levels, see Table C.2 on page 101.
• Alarm Sensitivity Levels - Select the sensitivity of a detector from 1-9 (1=highest
sensitivity; 9=lowest sensitivity).
• Pre-Alarm Sensitivity Levels - Select one of nine levels from 1 to 9 (0=no Pre-Alarm,
1=self-optimizing, 2=highest sensitivity, 9=lowest sensitivity). You can set Pre-Alarm
operation to Action (latching) or Alert (non-latching) and to activate Special Zones. For
instructions on programming, refer to "How to Select a Pre-Alarm Level" on page 100.
Set the sensitivity levels as fixed or programmed for day and night operation. For details, refer to
"Time Control Zones" on page 93.
NFS2-640/E Programming Manual — P/N 52742:L2 7/17/14
Prealarm Threshold
Time (days)
Figure C.3 Self-optimizing Pre-Alarm Level
Intelligent Sensing Applications
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