Description
The Notifier FAPT-851 is a commercial smoke and heat detector designed for compatible Notifier fire alarm systems. It combines smoke detection with integrated fixed-temperature heat sensing to provide dependable fire detection across a wide range of commercial applications.
The detector automatically adjusts its smoke sensitivity based on environmental conditions, helping reduce nuisance alarms while maintaining reliable performance. It features rotary decimal addressing, dual LED status indicators, and a plug-in design for simplified installation and maintenance. This product is intended exclusively for commercial fire alarm installations.
Product Functions
- Detects airborne smoke
- Detects fixed-temperature heat conditions
- Automatically adjusts detector sensitivity
- Reports fire alarm conditions
- Supports maintenance supervision
- Plug-in detector installation
- LED status indication
Electrical & System Information
The FAPT-851 operates on compatible Notifier signaling line circuits with an operating voltage of 15–32 VDC. Rotary decimal switches allow local device addressing, while the connected fire alarm control panel supervises detector status and maintenance information.
The detector automatically increases sensitivity as heat rises and can also operate in heat-only mode when supported by the compatible control panel.
Features
- Commercial smoke and heat detection
- Automatic sensitivity adjustment
- Integrated 135°F (57°C) heat sensor
- Rotary decimal addressing
- Dual bi-color LEDs with 360° visibility
- Plug-in detector head
- Magnetic functional test
- Tamper-resistant feature
- Low-profile housing
- Indoor commercial application
Mounting & Design
The FAPT-851 installs on compatible Notifier detector bases including B210LP, B501, B200S, B200SR, and B224RB. The removable detector head allows convenient installation, testing, cleaning, and replacement without disturbing field wiring.
Protection & Applications
Suitable for:
- Office Buildings
- Schools
- Hospitals
- Hotels
- Warehouses
- Industrial Facilities
- Government Buildings
- Retail Centers
- Commercial Properties
Compatibility
Compatible with:
- Notifier ONYX Fire Alarm Control Panels
- FlashScan Signaling Line Circuits
- CLIP Compatible Systems
- B210LP Detector Base
- B501 Detector Base
- B200S Sounder Base
- B200SR Sounder Relay Base
- B224RB Relay Base
- RA400Z Remote LED Annunciator
Always verify compatibility with the installed fire alarm control panel and detector base before installation.
Technical Specifications
Manufacturer: Notifier
Parent Company: Honeywell
Model: FAPT-851
Product Type: Commercial Smoke & Heat Detector
Smoke Detection: Smoke Sensing Chamber
Heat Detection: Fixed Temperature
Fixed Heat Rating: 135°F (57°C)
Operating Voltage: 15–32 VDC
Typical Standby Current: 300 µA @ 24 VDC
Maximum Alarm Current: 6.5 mA @ 24 VDC
Automatic Sensitivity: Yes
Sensitivity Range: 0.5%–4.0% Obscuration per Foot (System Dependent)
Operating Temperature: 32°F to 100°F (0°C to 38°C)
Operating Humidity: 10%–93% RH Non-Condensing
Air Velocity: 0–4,000 ft/min
Status Indicators: Dual Bi-Color LEDs
Addressing: Rotary Decimal Switches
Mounting: Compatible Notifier Detector Bases
Application: Indoor Commercial Fire Alarm Systems
Listings: UL 268, UL 521, FM Approved, CSFM Listed (application dependent).
Applications
The Notifier FAPT-851 is designed for commercial fire alarm systems requiring combined smoke and fixed-temperature heat detection with automatic sensitivity adjustment. It is commonly installed in office buildings, schools, hospitals, warehouses, industrial facilities, hotels, retail centers, and other commercial occupancies where environmental conditions may vary throughout the day.





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