LST ND2251EM User Manual

Description speciﬁ cations

ND2251EM_DBL_LST_EN_0804.PDF • PAGE 1

Building Safety. Building Security.

Description

Speciﬁ cations

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.

• ADM loop technology with

System Sensor/200 protocol

• Optional connection of remote

indicator

• Constant response sensitivity
• Extremely ﬂ at design
• Function testable with magnet

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 ш Ч H

102 × 45 (mm)

Colour

cream

Weight

102g

Approvals

VdS G200052

Order number

241010

Order name

Optical Smoke Detector/Anal./200/SS ND2251EM