LST Smoke Alarm 7251 User Manual

Optical Laser Smoke Detector  
7251  
• 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  
Description  
The addressable Optical Laser Smoke Detector 7251 The proven ADM loop technology with System Sen-  
uses the scattered light principle, and was developed sor/200 protocol establishes a permanent communica-  
for the precise detection of smoke particles in a wide tion between the fire detection control panel and the  
range of applications. The modern design of the sen- detector. That ensures a periodical function testing of  
sing chamber allows to reliably evaluate the characte- the detector. In the control panel all types of fires are  
ristics of fire.  
detected by continuously comparing fire patterns.  
Due to the high sensitivity of the laser detection cham- The influence of contamination on the optical measu-  
ber, the detector is ideal for applications where an early rement system is reduced with the help of the laser  
fire detection is crucial:  
• Computer rooms  
• Clean room manufacturing  
• Hospitals  
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.  
• Aspiration smoke detection systems  
The two LEDs with 360° visibility indicate the activated  
Depending on the application, the high sensitivity of the condition of the detector. The detector address is selec-  
detector is individually adjustable in 9 steps between ted with two decadic rotary switches, thus allowing to  
0.03%/m and 3.3%/m and provides a number of spe- quickly change the detector without additional tools.  
cial applications, which can not be covered using stan-  
dard optical smoke detectors.  
A detector function test can be conveniently conducted  
An optional pre-alarm can be activated two sensitivity using a magnet. The detector can be attached to va-  
levels before reaching the alarm level.  
rious bases and it can be protected against theft.  
Building Safety. Building Security.  
A
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7251_DBL_LST_EN_0819.PDF • PAGE 1  
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