LST 2251TEM Folheto

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2251TEM_DBL_LST_EN_0819.PDF • PAGE 1
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Building Safety. Building Security.
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 fi re 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 fi re.
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 fi xed 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  proven  ADM  loop  technology  with  System  Sen-
sor/200 protocol establishes a permanent communi-
cation between the fi re detection control panel and the 
detector. That ensures a periodical function testing of 
the detector.
The infl uence 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 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.
•   ADM loop technology with 
System Sensor/200 protocol
•   Combination of optical and thermal 
characteristics of fi re
•   Two self-learning and three fi xed 
sensitivity levels
•   Thermal-only operation
•   Constant response sensitivity
•   Function testable with magnet