LST ND2251EM User Manual

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Optical Smoke Detector

ND2251EM

ADM loop technology with System Sensor/200 protocol

Optional connection of remote indicator

Constant response sensitivity

Extremely fl at 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 proven ADM loop technology with System Sensor/200 protocol establishes a permanent communication between the fire detection control panel and the detector. That ensures a periodical function testing of the detector. In the control panel all types of fires are detected by continuously comparing fire patterns.

The two LEDs with 360° visibility indicate the activated condition of the detector. The detector address is selected 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 various bases and it can be protected against theft.

Specifi cations

Operating voltage

Supply through loop voltage

Current consumption

max. 200µA (quiescent)

Ambient temperature

-20°Cto +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

Building Safety. Building Security.

A

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