LST 2251CTLE User Manual

Description

0832–CPD–0518

2251CTLE_DBL_LST_EN_0850.PDF • PAGE 1

Building Safety. Building Security.

Description

The Multi-criteria Detector 2251CTLE incorporates four

separate detection units, allowing to determine the four

essential characteristics of ﬁ re:

•

– carbon monoxide

•

– optically visible smoke

•

– temperature

•

– infrared radiation

The typical patterns of ﬁ re are recognised by means

of intelligent analysis of the measured values of all four

detection units. That way on the one hand the detector

shows an especially high insensitiveness to unwanted

alarms, on the other hand ﬁ res are recognised quickly

and safely.

The multi-criteria detector can operate in difﬁ cult ﬁ elds

of application, for instance

• workshops – e.g., welding shops, paint shops

• hotel rooms with steam formation in the bathroom

• smoking areas in bars or restaurants

• discotheques with fog generators

• garages or loading ramps

and is therefore suitable for virtually universal use.

• ADM loop technology with

System Sensor/200 protocol

• Combines optical smoke sensor, heat

detector, infrared sensor and carbon

monoxide sensor

• Highest false alarm immunity
• Several sensitivity levels and thermal-

only mode selectable

• Constant response sensitivity

The optical measurement chamber uses the

scattered light principle to detect visible smoke

particles. The thermal unit responds to tempera-

ture changes within deﬁ ned time intervals (rate-

of-rise principle according to class A1R) up to a

maximum temperature of 58°C.

Smouldering ﬁ res which spread out slowly can

also be detected early and safely by using the

durable carbon monoxide sensor. The infrared

sensor responds to the ﬂ ickering of ﬂ ames and

supports the detection of ﬁ res with low smoke

development (e.g., alcoholic ﬁ res).

The two LEDs with 360° visibility indicate the

activated condition of the detector.