NFS2-640/E Programming Manual — P/N 52742:L2 7/17/14 97
Features Intelligent Sensing Applications
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:
Figure C.3 Self-optimizing Pre-Alarm Level
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:
• 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.
Awacs4a.wmf
Time (days)
Prealarm Threshold
Analog
Reading
NOTE: For a list of all detector sensitivity levels, see Table C.2 on page 101.
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