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Building Safety. Building Security.

The addressable Optical Smoke Detector ND2251EM 

uses the scattered light principle, and was developed 

for the detection of smoke particles in a wide range of 

applications. The modern design of the sensing cham-

ber  allows  to  reliably  evaluate  the  characteristics  of 

fi re.

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 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 selec-

ted 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.

Operating voltage  

Supply through loop voltage

Current consumption  

max. 200µA (quiescent)

Ambient temperature 

-20°C to +60°C

Relative humidity 

10 – 93% (no condensation)

Dimensions ø × H 

102 × 45 (mm)

Colour 

cream

Weight 

102g

Approvals 

VdS G200052

Order number 

241010

Order name 

Optical Smoke Detector/Anal./200/SS ND2251EM