Thorn ISN-550P Analog Addressable Photoelectric Smoke Detector

Description:

The Thorn ISN-550P Analog Addressable Photoelectric Smoke Detector is used in addressable fire alarm systems to provide early detection of visible smoke using photoelectric sensing technology and analog communication with compatible fire alarm control panels. Commonly installed in Thorn Autocall TFX Series fire alarm systems protecting commercial buildings, hospitals, schools, industrial facilities, hotels, and institutional properties requiring intelligent addressable fire detection. Fire alarm technicians and system integrators use this smoke detector for new installations, preventive maintenance, detector replacement, and upgrades to addressable fire detection systems. 

Applications:

The Thorn ISN-550P continuously monitors airborne smoke particles using an optical sensing chamber and transmits analog values to compatible Thorn Autocall TFX fire alarm control panels for intelligent alarm processing, drift compensation, maintenance monitoring, and device identification. It is widely used in commercial and industrial fire detection systems where reliable early smoke detection and continuous addressable supervision are required.

Technical Specifications:

• Brand: Thorn Automated Systems / Autocall
• Part Number: 920096
• Model: ISN-550P
• Series: 550 Series
• Product Type: Analog Addressable Photoelectric Smoke Detector Head
• Detection Technology: Photoelectric (Optical) Smoke Detection
• System Type: Analog Addressable Fire Alarm System
• Compatible Systems: Thorn Autocall TFX Series Fire Alarm Control Panels
• Operating Voltage: 17–30 VDC
• Communication: Analog Addressable
• Addressing Method: XPERT Address Card
• LED Indicator: Integral Alarm LED with Remote LED Output
• Operating Temperature: 0°C to 38°C (32°F to 100°F)
• Operating Humidity: Up to 85% Non-Condensing
• Compatible Bases: IBN-552 (920192), IBN-553 (920194), IBN-554 (920195)
• Application: Commercial and Industrial Fire Detection Systems
• Status: Discontinued by Manufacturer

Common Replacements:

• Thorn ISN-550I 920095
• Thorn IHN-135 920097
• Thorn IHN-200 920098