LST 7251 Manual Do Utilizador

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Building Safety. Building Security.
Description
The addressable Optical Laser Smoke Detector 7251 
uses the scattered light principle, and was developed 
for the precise detection of smoke particles in a wide 
range of applications. The modern design of the sen-
sing chamber allows to reliably evaluate the characte-
ristics of fi re.
Due to the high sensitivity of the laser detection cham-
ber, the detector is ideal for applications where an early 
fi re detection is crucial:
•  Computer rooms
•  Clean room manufacturing
•  Hospitals
•  Aspiration smoke detection systems
Depending on the application, the high sensitivity of the 
detector is individually adjustable in 9 steps between 
0.03%/m and 3.3%/m and provides a number of spe-
cial applications, which can not be covered using stan-
dard optical smoke detectors.
An optional pre-alarm can be activated two sensitivity 
levels before reaching the alarm level.
The  proven  ADM  loop  technology  with  System  Sen-
sor/200 protocol establishes a permanent communica-
tion  between  the  fi re  detection  control  panel  and  the 
detector. That ensures a periodical function testing of 
the detector. In the control panel all types of fi res are 
detected by continuously comparing fi re patterns.
The  infl uence  of  contamination  on  the  optical  measu-
rement  system  is  reduced  with  the  help  of  the  laser 
principle and furthermore compensated for by using in-
telligent evaluation algorithms. With that, the response 
sensitivity of the detector is kept constant for a long 
time – a further effective step to avoid false alarms.
The two LEDs with 360° visibility indicate the activated 
condition of the detector. The detector address is selec-
ted with two decadic rotary switches, thus allowing to 
quickly change the detector without additional tools.
A detector function test can be conveniently conducted 
using a magnet. The detector can be attached to va-
rious bases and it can be protected against theft.
•   ADM loop technology with 
System Sensor/200 protocol
•   Up to 100 times more sensitive than 
common optical smoke detectors
•   Sensitivity selectable in 9 steps
•   Optional pre-alarm function
•   Automatic drift compensation
•   Highly insensitive to contamination
•   Function testable with magnet