LST 2251EIS user manual

Summary of the content on the page No. 1

Devices for Hazardous Areas
for the System Sensor/200 Loop
• Optical smoke detector
• Safety barrier with galvanic isolation
fi g. A
• Protocol interface for communication
with the fi re detection control panel
fi g. B
• A TEX certifi ed
fi g. C
IS Optical Smoke Detector 2251EIS
The addressable Intrinsically Safe Optical Smoke Detec- of the next maintenance. Thus the alarm threshold is
tor 2251EIS (fi g. A) uses the scattered light principle automatically adjusted within the permissible range, de-

Summary of the content on the page No. 2

Safety Barrier Y72221 The Safety Barrier Y72221 (fi g. B) is used for intrinsi- detectors in hazardous areas. Due to the galvanic isola- cally safe electric circuits. The built-in zener barrier and tion, the earth leakage monitoring can remain activated the safe galvanic isolation allow the connecton of fi re in the fi re detection control panel. Specifi cations Ignition protection intrinsically safe Ex classifi cation EEx ia IIC T5 Operating voltage Supply through the detector line voltage Ambient