LST Smoke Alarm 2251TEM User Manual

Multisensor

2251TEM

• ADM loop technology with

System Sensor/200 protocol

• Combination of optical and thermal

characteristics of ﬁre

• Two self-learning and three ﬁxed

sensitivity levels

• Thermal-only operation

• Constant response sensitivity

• Function testable with magnet

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 ﬁre 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 ﬁre.

cation between the ﬁre detection control panel and the

detector. That ensures a periodical function testing of

the detector.

The inﬂuence 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 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 ﬁxed 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 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.

The proven ADM loop technology with System Sen-

sor/200 protocol establishes a permanent communi-

Building Safety. Building Security.

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