124 NFS2-3030 Programming Manual — P/N 52545:K1 03/20/2012
Intelligent Sensing Applications Detector Sensitivity Settings
• The Pre-Alarm indication for this detector will restore automatically to normal if its
obscuration reading drops below pre-alarm level.
• A subsequent alarm for this detector also clears the
Pre-Alarm indication.
D.3.3 Action Level
Action Functions
If you program a detector for Action Pre-Alarm and the detector reaches a level that exceeds the
programmed Pre-Alarm level, the control panel indicates an Action condition. The control panel
does the following functions when a detector reaches the programmed pre-alarm level:
• The Action message is sent to the History buffer and inst
alled printers. The message is sent
(and time stamped) only at the time that it first occurred. This historical data could provide
valuable information about the progress of a fire.
• The
PRE-ALARM LED and panel sounder pulse until acknowledged.
• The zone that is in the tenth position of the zone map for this detector activates. The tenth
zone is the right
-most entry on line two of the detector zone map list in the Point
Programming screen. (For more information on detector zone positions, refer to Figure 3.33
and the accompanying text). The tenth zone can be used to
control functions of
a detector or
group of detectors once the pre-alarm level is reached. Tenth zone activations also allow
ACS annunciation by a detector or group of detectors in Action Pre-Alarm condition.
• Zone Z000 (general alarm) or any other zone and the System Trouble and System Alarm
relays do not activate.
•
The Pre-Alarm condition and the zone programmed will
latch until system reset, even if the
obscuration reading drops below the pre-alarm level.
• A subsequent alarm condition for this detector clears the Action indication from the LCD
display alarm
list.
D.4 Detector Sensitivity Settings
D.4.1 How to Select Pre-Alarm and Alarm Sensitivity
Each detector provides a host of selectable intelligent options. The control panel provides nine
levels of Pre-Alarm (PA:1–PA:9) and Alarm (AL:1–AL:9) in percent per foot obscuration:
• PA:0 no
Pre-Alarm selection.
• PA:1 th
e self-optimizing setting where the control panel selects a suitable Pre-Alarm level
for a detector.
• PA:2–PA
:9 the detector Pre-Alarm sensitivity level - with PA:2 the most sensitive and PA:9
the least sensitive.
• AL:1–AL:9 th
e detector Alarm sensitivity level - with AL:1 the most sensitive and AL:9
the least sensitive.
Detector Type Alarm (FlashScan) Pre-Alarm
Photo Electric
SMOKE (PHOTO)
(See note
*
)
AL:1=0.50 %
AL:2=0.73 %
AL:3=0.96 %
AL:4=1.19 %
AL:5=1.43 %
AL:6=1.66 %
AL:7=1.89 %
AL:8=2.12 %
~
AL:9=2.35 %
PA:1=Auto
PA:2=0.30 %
PA:3=0.47 %
PA:4=0.64 %
PA:5=0.81 %
PA:6=0.99 %
PA:7=1.16 %
PA:8=1.33 %
~
PA:9=1.50 %
Table D.2 Detector Sensitivity Settings (1 of 2)
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