LST 2251TEM manual

2251TEM_DBL_LST_EN_0819.PDF • PAGE 1

ABuilding Safety. Building Security.

Description

The addressable Multisensor 2251TEM uses the

scattered light principle as well as a separate thermal

detection unit. It was developed to detect the charac-

teristics of ﬁ re in a wide range of applications, and to

avoid deceptive alarms. The modern design of both

measurement systems and the analysis of the parame-

ters by means of a special algorithm allow to reliably

evaluate the characteristics of ﬁ re.

The sensitivity of the detector can be individually adjus-

ted in 5 steps between 1.5%/m and 5.2%/m according

to the application. Three steps have a ﬁ xed sensitivity,

whereas two self-learning steps automatically adjust the

sensitivity to short-term changes of the environmental

conditions. Furthermore, the optical detection unit can

be completely disabled for a thermal-only operation.

The proven ADM loop technology with System Sen-

sor/200 protocol establishes a permanent communi-

cation between the ﬁ re detection control panel and the

detector. That ensures a periodical function testing of

the detector.

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 se-

lected 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

• Combination of optical and thermal

characteristics of ﬁ re

• Two self-learning and three ﬁ xed

sensitivity levels

• Thermal-only operation

• Constant response sensitivity

• Function testable with magnet