FDX-551R | Notifier Rate-of-Rise Temperature Sensor
Notifier · Sensors & Instrumentation
Description The FDX‑551R is a plug-in, intelligent analog rate-of-rise temperature sensor in Notifier’s legacy product line, designed to detect rapid temperature increases indicative of fire. Technical Specifications Condition New/Never Used Surplus Brand Notifier Category Fire Safety Part Number FDX-551R Subcategory Fire Alarm Systems Device Type Fire Detector – Heat Sensor Detection Method Rate-of-Rise (≥ 15°F/min) Sensing Components Dual Thermistors Detection Modes Rate-of-Rise, Fixed Temperature, Fixed High Temperature Communication Type Analog Addressable Address Configuration Rotary DECADE switches (01–99) Operating Voltage 15–28 VDC Mounting Base Uses common sensor base Remote LED Output Standard Visual Indicators Dual 360° visible LEDs (blink on poll, steady on alarm) Test Feature Built-in magnetic test switch Optional Base Features Supports Relay, Isolator, and Sounder bases Tamper-Resistance Yes Noise Immunity Stable communication with high noise immunity Weight 0.25 kgs Information About FDX-551R The FDX‑551R is part of Notifier’s legacy line of intelligent rate-of-rise heat detectors, engineered for responsive detection of rapid temperature increases in fire alarm systems. Designed to detect a temperature rise exceeding 15°F per minute, it also features a fixed-temperature threshold for reliable activation under fast-developing fire conditions. Compatible with Notifier’s addressable analog control panels, the FDX‑551R communicates real-time data and status updates while maintaining low standby current and high noise immunity. Its plug-in design, 360° visible LED indicators, and tamper-resistant features make it an ideal solution for commercial and industrial environments requiring thermal detection without the sensitivity of smoke-based sensing. Key Features: Rate-of-Rise Detection: Activates when ambient temperature increases more than 15°F per minute, providing early warning of fast-growing fires. Fixed Temperature Backup: Includes a static alarm threshold (typically 135°F) for reliable activation in heat-intensive conditions. Analog Addressable Operation: Communicates real-time thermal data to Notifier panels for detailed event tracking and system diagnostics. Dual Thermistor Technology: Provides accurate, stable temperature sensing with minimal false alarms. 360° LED Visibility: Twin LEDs offer alarm indication from any viewing angle; configurable blink for polling. Plug-In Base Compatibility: Easily mounts onto standard Notifier bases (e.g., B501 or BX-501), supporting rapid installation and servicing. Magnetic Test Capability: Built-in switch supports activation using an external magnet for simplified functional testing. Tamper-Resistant Design: Prevents unauthorized removal or manipulation without tools. Optional Base Features: Supports relay, isolator, or sounder bases for enhanced system integration. Environmental Ratings: Operates from 32°F to 100°F (0°C to 38°C) with up to 93% non-condensing humidity. The Notifier FDX‑551R provided fast and intelligent thermal detection in addressable systems where smoke detection may not be suitable. Though discontinued, it remains a reliable legacy solution in many installations and is functionally replaced in modern systems by devices like the FST-951R or NFX-TDIFF-IV.
Brand: Notifier · Category: Sensors & Instrumentation
Key features
- Rate-of-Rise Detection: Activates when ambient temperature increases more than 15°F per minute, providing early warning of fast-growing fires.
- Fixed Temperature Backup: Includes a static alarm threshold (typically 135°F) for reliable activation in heat-intensive conditions.
- Analog Addressable Operation: Communicates real-time thermal data to Notifier panels for detailed event tracking and system diagnostics.
- Dual Thermistor Technology: Provides accurate, stable temperature sensing with minimal false alarms.
- 360° LED Visibility: Twin LEDs offer alarm indication from any viewing angle; configurable blink for polling.
- Plug-In Base Compatibility: Easily mounts onto standard Notifier bases (e.g., B501 or BX-501), supporting rapid installation and servicing.
- Magnetic Test Capability: Built-in switch supports activation using an external magnet for simplified functional testing.
- Tamper-Resistant Design: Prevents unauthorized removal or manipulation without tools.
- Optional Base Features: Supports relay, isolator, or sounder bases for enhanced system integration.
- Environmental Ratings: Operates from 32°F to 100°F (0°C to 38°C) with up to 93% non-condensing humidity.
Specifications
| Manufacturer part number | FDX-551R |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Notifier |
| Category | Fire Safety |
| Part Number | FDX-551R |
| Subcategory | Fire Alarm Systems |
| Device Type | Fire Detector – Heat Sensor |
| Detection Method | Rate-of-Rise (≥ 15°F/min) |
| Sensing Components | Dual Thermistors |
| Detection Modes | Rate-of-Rise, Fixed Temperature, Fixed High Temperature |
| Communication Type | Analog Addressable |
| Address Configuration | Rotary DECADE switches (01–99) |
| Operating Voltage | 15–28 VDC |
| Mounting Base | Uses common sensor base |
| Remote LED Output | Standard |
| Visual Indicators | Dual 360° visible LEDs (blink on poll, steady on alarm) |
| Test Feature | Built-in magnetic test switch |
| Optional Base Features | Supports Relay, Isolator, and Sounder bases |
| Tamper-Resistance | Yes |
| Noise Immunity | Stable communication with high noise immunity |
| Weight | 0.25 kgs |
| Product type | Rate-of-Rise Temperature Sensor |
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