CPX-551 | Notifier Intelligent Ionization Smoke Detector

Notifier · Fire & Life Safety

Description  The Notifier APS‑6R is a 150-watt switching auxiliary power supply, designed to deliver reliable, filtered 24 VDC power for fire alarm systems.     Technical Specifications  Condition New/Never Used Surplus Brand Notifier Category Fire Safety Part Number CPX-551 Subcategory Smoke Detector Device Type Smoke Detector Detection Method Intelligent Ionization Operation Addressable, Plug-In Sensitivity Range MOD 400(R): 0.40 – 0.99 Volts Nominal Sensitivity 1.06 ± 0.26% ft. Maximum Operating Temp. 120°F (48.9°C) Application For use only with duct housings DHX‑501 / DHX‑502 Certifications/IDs BSA578-81-SA, N04-503-04, 7081 BC Weight 0.45 lbs     Information About CPX-551 The CPX‑551 is part of Notifier’s legacy line of intelligent ionization smoke detectors, designed for rapid detection of fast-flaming fires in commercial fire alarm systems. Engineered for compatibility with Notifier’s addressable control panels, the CPX‑551 communicates real-time analog data for precise monitoring and maintenance alerts. Its low-profile, plug-in design simplifies installation while maintaining secure chamber integrity. Paired exclusively with duct housings DHX‑501 or DHX‑502, the detector was widely used in air handling systems before being discontinued in 2015 due to the industry-wide phase-out of ionization technology. Key Features: Ionization Sensing Technology: Detects small combustion particles from fast-flaming fires using a single-source ionization chamber. Intelligent Addressable Operation: Communicates analog smoke levels to the control panel, enabling maintenance alerts and precise event logging. Plug-In Mounting: Installs easily on compatible bases with twist-lock engagement, reducing installation time and wiring complexity. Low-Profile Design: Compact form with a height of ~1.66" supports aesthetic and space-sensitive ceiling applications. Magnetic Test Capability: Built-in magnetic switch allows testing without removal from base. Dedicated Duct Housing Compatibility: Designed specifically for use with Notifier DHX‑501 and DHX‑502 duct detector housings. Thermal Ratings: Operates in environments up to 120°F (48.9°C), suited for HVAC systems and equipment rooms. Legacy Compliance: Provided nominal sensitivity of 1.06 ± 0.26%/ft with MOD 400(R) voltage range of 0.40–0.99 V. The Notifier CPX‑551 offered fast, addressable ionization-based smoke detection in a compact, intelligent platform. Although discontinued in July 2015, it remains in use in legacy duct applications where rapid detection of flaming fires was critical. For modern replacements, Notifier recommends transitioning to photoelectric or multi-criteria sensor technologies.

Brand: Notifier · Category: Fire & Life Safety

Key features

• Ionization Sensing Technology: Detects small combustion particles from fast-flaming fires using a single-source ionization chamber.
• Intelligent Addressable Operation: Communicates analog smoke levels to the control panel, enabling maintenance alerts and precise event logging.
• Plug-In Mounting: Installs easily on compatible bases with twist-lock engagement, reducing installation time and wiring complexity.
• Low-Profile Design: Compact form with a height of ~1.66" supports aesthetic and space-sensitive ceiling applications.
• Magnetic Test Capability: Built-in magnetic switch allows testing without removal from base.
• Dedicated Duct Housing Compatibility: Designed specifically for use with Notifier DHX‑501 and DHX‑502 duct detector housings.
• Thermal Ratings: Operates in environments up to 120°F (48.9°C), suited for HVAC systems and equipment rooms.
• Legacy Compliance: Provided nominal sensitivity of 1.06 ± 0.26%/ft with MOD 400(R) voltage range of 0.40–0.99 V.

Specifications

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