LST Smoke Alarm 2251TEM User Manual

Multisensor  
2251TEM  
• ADM loop technology with  
System Sensor/200 protocol  
• Combination of optical and thermal  
characteristics of fire  
• Two self-learning and three fixed  
sensitivity levels  
• Thermal-only operation  
• Constant response sensitivity  
• Function testable with magnet  
Description  
The addressable Multisensor 2251TEM uses the  
scattered light principle as well as a separate thermal  
detection unit. It was developed to detect the charac-  
teristics of fire in a wide range of applications, and to  
avoid deceptive alarms. The modern design of both  
measurement systems and the analysis of the parame-  
ters by means of a special algorithm allow to reliably  
evaluate the characteristics of fire.  
cation between the fire detection control panel and the  
detector. That ensures a periodical function testing of  
the detector.  
The influence of contamination on the optical measu-  
rement system is compensated for by using intelligent  
evaluation algorithms. With that, the response sensiti-  
vity of the detector is kept constant for a long time –  
a further effective step to avoid false alarms.  
The sensitivity of the detector can be individually adjus-  
ted in 5 steps between 1.5%/m and 5.2%/m according  
to the application. Three steps have a fixed sensitivity,  
whereas two self-learning steps automatically adjust the  
sensitivity to short-term changes of the environmental  
conditions. Furthermore, the optical detection unit can  
be completely disabled for a thermal-only operation.  
The two LEDs with 360° visibility indicate the activated  
condition of the detector. The detector address is se-  
lected with two decadic rotary switches, thus allowing  
to 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.  
The proven ADM loop technology with System Sen-  
sor/200 protocol establishes a permanent communi-  
Building Safety. Building Security.  
A
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