122 NFS2-3030 Programming Manual — P/N 52545:K1 03/20/2012
Intelligent Sensing Applications Intelligent Sensing Features
D.2.3 Self-Optimizing Pre-Alarm
You can set each detector, except FST-851/751 (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 D.3 Self-optimizing Pre-Alarm Level
D.2.4 Detector Sensitivity
The control panel provides nine Sensitivity Levels (Table D.2 on page 124) for alarm detection and
pre-alarm as follows:
• Alarm Sensitivity Levels
You can select the sensitivity of a detector from 1-9 (1=highest
sensitivity; 9=lowest sensitivity).
• Pre-Alarm Sensitivity Levels Y
ou can 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 Appendix D.3, “Pre-Alarm”, on page 123.
You can set the sensitivity levels as fixed or programmed for day and night operation.
A sample sensitivity window for a laser detector:
Figure D.4 Sample Sensitivity Levels f
or a FlashScan View Laser Detector
Awacs4a.cdr
Time (days)
Prealarm Threshold
Analog
Reading
2.0% Alarm Selection 9
1.5% Alarm Selection 8
1.0% Alarm Selection 7
0.5% Alarm Selection 6
0.2% Alarm Selection 5
0.1% Alarm Selection 4
0.05% Alarm Selection 3
0.03% Alarm Selection 2
0.02% Alarm Selection 1
1.5% Pre-Alarm 9
1.00% Pre-Alarm 8
0.7% Pre-Alarm 7
0.5% Pre-Alarm 6
0.2% Pre-Alarm 5
0.1% Pre-Alarm 4
0.05% Pre-Alarm 3
0.02% Pre-Alarm 2
Self Adjust 1
2.0%
2.1%
1.5%
1.0%
0.7%
0.5%
0.2%
0.1%
0.05%
SAMPLE
SENSITIVITY
WINDOW, laser detector
OBSCURATION (% PER FOOT)
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