LST 2251TEM User manual

Brand: LST

Model: 2251TEM

Type: User manual

LST 2251TEM is an addressable multisensor that combines optical and thermal detection technologies to reliably detect fire in various applications. Its advanced algorithms analyze both scattered light and thermal characteristics, enabling it to distinguish between real fires and deceptive alarms.

With adjustable sensitivity levels from 1.5%/m to 5.2%/m, you can customize the detector's response to suit your specific environment. It also features a thermal-only mode, allowing you to disable the optical detection for specialized applications.

The LST 2251TEM seamlessly integrates with System Sensor/200 protocol, ensuring constant communication with the fire detection control panel for regular function testing. Its intelligent evaluation algorithms compensate for contamination, maintaining consistent response sensitivity over time.

2251TEM_DBL_LST_EN_0819.PDF • PAGE 1

ABuilding Safety. Building Security.

Multisensor

2251TEM

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

2251TEM_DBL_LST_EN_0819.PDF • PAGE 2

ABuilding Safety. Building Security.

Speciﬁ cations

Operating voltage Supply through loop voltage

Current consumption typ. 250µA (quiescent)

Alarm temperature 57°C (maximum-heat component)

Operating temperature max. +45°C

Ambient temperature -20°C to +60°C (no condensation or icing)

Relative humidity 10 – 93% (no condensation)

Dimensions ø × H 102 × 45 (mm)

Colour cream

Weight 115g

Approvals VdS G201041

At operation in thermal-only mode:

EN 54-5 Class A1R 57°C maximum and rate-of-rise activation

Room height max. 7.5m

Order number 241020

Order name Optical-Thermal Detector/Anal./200/SS 2251TEM

LST 2251TEM User manual

LST 2251TEM User manual

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