0832–CPD–0518
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2251CTLE_DBL_LST_EN_0850.PDF • PAGE 1
A
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:
•
C
– carbon monoxide
•
OP
– optically visible smoke
•
T
– temperature
•
IR
– 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.
