LST 7251 Bedienungsanleitung

7251_DBL_LST_EN_0819.PDF • PAGE 1

ABuilding Safety. Building Security.

Optical Laser Smoke Detector

7251

Description

The addressable Optical Laser Smoke Detector 7251

uses the scattered light principle, and was developed

for the precise detection of smoke particles in a wide

range of applications. The modern design of the sen-

sing chamber allows to reliably evaluate the characte-

ristics of ﬁ re.

Due to the high sensitivity of the laser detection cham-

ber, the detector is ideal for applications where an early

ﬁ re detection is crucial:

• Computer rooms

• Clean room manufacturing

• Hospitals

• Aspiration smoke detection systems

Depending on the application, the high sensitivity of the

detector is individually adjustable in 9 steps between

0.03%/m and 3.3%/m and provides a number of spe-

cial applications, which can not be covered using stan-

dard optical smoke detectors.

An optional pre-alarm can be activated two sensitivity

levels before reaching the alarm level.

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 reduced with the help of the laser

principle and furthermore compensated for by using in-

telligent evaluation algorithms. With that, the response

sensitivity 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

quickly 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

• Up to 100 times more sensitive than

common optical smoke detectors

• Sensitivity selectable in 9 steps

• Optional pre-alarm function

• Automatic drift compensation

• Highly insensitive to contamination

• Function testable with magnet

7251_DBL_LST_EN_0819.PDF • PAGE 2

ABuilding Safety. Building Security.

Speciﬁ cations

Operating voltage Supply through loop voltage

Current consumption max. 330µA (quiescent)

Ambient temperature -10°C to +50°C

Relative humidity 10 – 93% (no condensation)

Dimensions ø × H 103 × 42 (mm)

Colour cream

Weight 159g

Approval VdS G202051

Order number 241050

Order name Optical Laser Detector/Anal./200/SS 7251

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