LST Smoke Alarm ND2251EM User Manual

Optical Smoke Detector  
ND2251EM  
• ADM loop technology with  
System Sensor/200 protocol  
• Optional connection of remote  
indicator  
• Constant response sensitivity  
• Extremely flat design  
• Function testable with magnet  
Description  
The addressable Optical Smoke Detector ND2251EM The influence of contamination on the optical measu-  
uses the scattered light principle, and was developed rement system is compensated for by using intelligent  
for the detection of smoke particles in a wide range of evaluation algorithms. With that, the response sensiti-  
applications. The modern design of the sensing cham- vity of the detector is kept constant for a long time –  
ber allows to reliably evaluate the characteristics of a further effective step to avoid false alarms.  
fire.  
The two LEDs with 360° visibility indicate the activated  
The proven ADM loop technology with System Sen- condition of the detector. The detector address is selec-  
sor/200 protocol establishes a permanent communica- ted with two decadic rotary switches, thus allowing to  
tion between the fire detection control panel and the change the detector without additional tools.  
detector. That ensures a periodical function testing of  
the detector. In the control panel all types of fires are A detector function test can be conveniently conducted  
detected by continuously comparing fire patterns.  
using a magnet. The detector can be attached to va-  
rious bases and it can be protected against theft.  
Specifications  
Operating voltage  
Current consumption  
Ambient temperature  
Relative humidity  
Dimensions ø × H  
Colour  
Supply through loop voltage  
max. 200µA (quiescent)  
-20°C to +60°C  
10 – 93% (no condensation)  
102 × 45 (mm)  
cream  
Weight  
102g  
Approvals  
VdS G200052  
Order number  
Order name  
241010  
Optical Smoke Detector/Anal./200/SS ND2251EM  
Building Safety. Building Security.  
A
© LABOR STRAUSS SICHERUNGSANLAGENBAU GMBH • A-1231 WIEN • WIEGELESTRASSE 36 • TEL +43 1 52114-0 • FAX +43 1 52114-27  
ND2251EM_DBL_LST_EN_0804.PDF • PAGE 1  
[email protected] • WWW.LST.AT • ALL RIGHTS RESERVED  
 

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