SDX-551 | Notifier Fire Alarm Photoelectric Detector

Notifier · Fire & Life Safety

Description  The SDX‑551 is a plug-in, intelligent photoelectric smoke detector designed for open‑area fire protection in commercial systems.     Technical Specifications  Condition New/Never Used Surplus Brand Notifier Category Fire Safety Part Number SDX-551 Subcategory Smoke Detector Installation Temperature Range SDX-551: 32°F to 120°F (0°C to 49°C); SDX-551TH: 32°F to 100°F (0°C to 38°C) Operating Humidity Range 10% to 93% Relative Humidity (Non-Condensing) Mounting Options BX-501 (flanged), B501 (flangeless), or B501 with RMK400 (recessed kit) Maximum Air Velocity 3000 ft/min (15 m/s) Voltage Range 15 to 32 VDC Peak Standby Current 150 µA @ 24 VDC LED Current (Alarm Indication) 6 mA @ 24 VDC Weight 0.272 kgs     Information About SDX-551 The SDX‑551 is part of Notifier’s legacy line of intelligent photoelectric smoke detectors, designed for precise and early detection of smoldering fires in open-area environments. Engineered for compatibility with Notifier's addressable control panels like the AM2020, AFP1010, and NFS-3030, the SDX‑551 communicates real-time smoke levels using analog signaling via the SLC loop. Its low-profile, plug-in form factor allows fast installation into standard Notifier detector bases, while built-in 360° bi-color LEDs provide visual status from any direction. The optional SDX‑551TH model includes thermal detection for environments requiring both smoke and heat sensing. Though discontinued, the SDX‑551 remains a dependable component in legacy intelligent fire alarm systems. Key Features: Photoelectric Sensing: Utilizes a refined optical chamber to detect smoldering fires with minimal false alarms. Addressable Analog Communication: Sends continuous real-time smoke level data to compatible Notifier panels for detailed event reporting. Plug-In Design: Easily installs into BX‑501 or B501 bases with twist-lock mounting, supporting rapid deployment and serviceability. 360° Visible LEDs: Bi-color status indicators provide polling and alarm visibility from any angle; remote control via panel. Thermal Variant Available: SDX‑551TH includes a fixed 135°F thermal sensor for environments requiring dual detection. Flexible Mounting: Supports flanged and flangeless base options, with optional recessed mounting using RMK400. Environmental Durability: Operates from 32°F to 120°F with up to 93% relative humidity; approved for air velocities up to 3000 ft/min. Low Current Draw: 150 µA in standby, 6 mA in alarm state at 24 VDC for energy-efficient operation. The Notifier SDX‑551 delivered reliable and intelligent smoke detection for a wide range of applications. Its combination of addressable features, optical accuracy, and legacy panel support ensures it remains a vital component in many long-standing fire alarm systems.

Brand: Notifier · Category: Fire & Life Safety

Key features

• Photoelectric Sensing: Utilizes a refined optical chamber to detect smoldering fires with minimal false alarms.
• Addressable Analog Communication: Sends continuous real-time smoke level data to compatible Notifier panels for detailed event reporting.
• Plug-In Design: Easily installs into BX‑501 or B501 bases with twist-lock mounting, supporting rapid deployment and serviceability.
• 360° Visible LEDs: Bi-color status indicators provide polling and alarm visibility from any angle; remote control via panel.
• Thermal Variant Available: SDX‑551TH includes a fixed 135°F thermal sensor for environments requiring dual detection.
• Flexible Mounting: Supports flanged and flangeless base options, with optional recessed mounting using RMK400.
• Environmental Durability: Operates from 32°F to 120°F with up to 93% relative humidity; approved for air velocities up to 3000 ft/min.
• Low Current Draw: 150 µA in standby, 6 mA in alarm state at 24 VDC for energy-efficient operation.

Specifications

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