LST 7251 User Manual

Description

7251_DBL_LST_EN_0819.PDF • PAGE 1

Building Safety. Building Security.

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