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Ex-Sys200_DBL_LST_EN_0804.PDF • PAGE 1
ABuilding Safety. Building Security.
Devices for Hazardous Areas
for the System Sensor/200 Loop
IS Optical Smoke Detector 2251EIS
Specifi cations
Ignition protection intrinsically safe
Ex classifi cation EEx ia IIB T5
Operating voltage Supply through loop voltage
Current consumption at 24V 330µA
Ambient temperature -25°C to +70°C
Relative humidity 5 – 95% (no condensation)
Dimensions ø × H 103 × 43 (mm)
Colour cream
Weight 110g
Approval BASEEFA03ATEX0157X
LPCB 199m
Order number 241025
Order name IS Optical Smoke Detector/Anal./200/SS 2251EIS
The addressable Intrinsically Safe Optical Smoke Detec-
tor 2251EIS (fi g. A) uses the scattered light principle
and was developed for the detection of smoke particles
in hazardous areas. The modern design of the sensing
chamber allows to reliably evaluate the characteristics
of fi re.
The proven ADM loop technology with System Sen-
sor/200 protocol establishes a permanent communica-
tion between the fi re detection control panel and the
detector. That ensures a periodical function testing of
the detector. In the control panel all types of fi res are
detected by continuously comparing fi re patterns.
Intelligent evaluation algorithms use the current condi-
tion of the sensing chamber to predict the likely time
of the next maintenance. Thus the alarm threshold is
automatically adjusted within the permissible range, de-
pending on the contamination. With that, the constant
response sensitivity of the detector is ensured for a
long time.
The two LEDs with 360° visibility indicate the activated
condition of the detector. The detector address is selec-
ted 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 or test gas. The detector can be pro-
tected against theft.
• Optical smoke detector
• Safety barrier with galvanic isolation
• Protocol interface for communication
with the fi re detection control panel
• ATEX certifi ed
fi g. A
fi g. B
fi g. C