LST ND2251EM Specification Sheet

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
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.
Specifi cations
Operating voltage
Current consumption
Ambient temperature
Relative humidity
Dimensions ø × H
Colour
Weight
Approvals
Order number
Order name
Building Safety. Building Security.
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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.
Supply through loop voltage
max. 200µA (quiescent)
-20°C to +60°C
10 – 93% (no condensation)
102 × 45 (mm)
cream
102g
VdS G200052
241010
Optical Smoke Detector/Anal./200/SS ND2251EM
A
ND2251EM_DBL_LST_EN_0804.PDF • PAGE 1