All Categories > Fire & Safety Products > Fire Alarm System Components and Products > Notifier Honeywell FSP-851 Smoke Detectors > Item # FSP-851  

Item # FSP-851, Honeywell FSP-851 Smoke Detector

Notifier 851 Series intelligent plug-in smoke detectors with integral communication provide features that surpass conventional detectors. Detector sensitivity can be programmed in the control panel software. Sensitivity is continuously monitored and reported to the panel. Point ID capability allows each detector’s address to be set with decade address switches, providing exact detector location for selective maintenance when chamber contamination reaches an unacceptable level. The FSP-851 photoelectric detector’s unique optical sensing chamber is engineered to sense smoke produced by a wide range of combustion sources. Dual electronic thermistors add 135°F (57°C) fixed-temperature thermal sensing on the FSP-851T. The FSP-851R is a remote test capable detector for use with DNR(W) duct detector housings. FSP-851 series detectors are compatible with all ONYX series Notifier intelligent Fire Alarm Control Panels (FACP).

FlashScan® (U.S. Patent 5,539,389) is a communication protocol developed by Notifier that greatly increases the speed of communication between analog intelligent devices. Intelligent devices communicate in a grouped fashion. If one of the devices in the group has new information, the panel’s CPU stops the group poll and concentrates on single points. The net effect is response speed greater than five times that of earlier designs.

Specifications  · Features  · Detector Spacing and Applications  · Installations  · Agency Listings and Approvals  · Accessories




Shipping Weight

5.2 oz

Operating Temperature

0 to 49 ºC
32 to 120

UL/ULC Listed Velocity Range

0-4000 ft/min. (1219.2 m/min.), suitable for installation in ducts

Relative Humidity

10% - 93% noncondensing

Thermal Rating

Fixed-Temperature Setpoint 135°F (57°C)

Voltage Range

15 - 32 volts DC peak

Standby Current (max. avg.)

300µA @ 24VDC (one communication every five seconds with LED enabled)

Max. Led Current

6.5mA @ 24VDC (‘ON’)


2.1 in


4.1" (10.4 cm) diameter installed in B501 base, 6.1" (15.5 cm) diameter installed in B710LP base.

Base Available

B200SR(A), Intelligent Sounder Base
B224BI(A), Isolator Base
B224RB(A), Relay Base
B501(A), 4.1" (10.4 cm) Diameter
B710LP(A), 6.1" (15.5 cm) Diameter

  • Sleek, low-profile design.
  • Addressable-analog communication.
  • Stable communication technique with noise immunity.
  • Low standby current.
  • Two-wire SLC connection.
  • FlashScan (NFS-320, NFS-640, NFS2-640, NFS-3030, NFS2-3030) and classic CLIP systems (AFP-100, AFP- 200, AFP-300, AFP-400, NFS-640, AM2020/AFP1010, NFS-3030) compatible.
  • Rotary, decimal addressing (1-99 on CLIP systems, 1-159 on FlashScan systems).
  • Optional remote, single-gang LED accessory.
  • Dual LED design provides 360° viewing angle.
  • Visible bi-color LEDs blink green every time the detector is addressed, and illuminate steady red on alarm (FlashScan systems only).
  • Remote test feature from the panel.
  • Walk test with address display (an address on 121 will blink the detector LED: 12-[pause]-1(FlashScan systems only).
  • Built-in functional test switch activated by external magnet.
  • Built-in tamper-resistant feature.
  • Sealed against back pressure.
  • Constructed of off-white Bayblend®, designed to commercial standards, and offers an attractive appearance.
  • 94-5V plastic flammability rating.
  • SEMS screws for wiring of the separate base.
  • Optional relay, isolator, and sounder bases.

Detector Spacing and Applications
Notifier recommends spacing detectors in compliance with NFPA 72. In low airflow applications with smooth ceiling, space detectors 30 feet (9.144m) for ceiling heights 10 feet (3.148m) and higher. For specific information regarding detector spacing, placement, and special applications refer to NFPA 72. System Smoke Detector Application Guide, document A05-1003, is available at

FSP-851 plug-in detectors use a separate base to simplify installation, service, and maintenance. A special tool allows maintenance personnel to plug in and remove detectors without using a ladder.

Mount base on an electrical backbox which is at least 1.5” (3.81cm) deep. Suitable mounting base boxes include:
  • 4.0” (10.16cm) square box.
  • 3.5” (8.89cm) or 4.0” (10.16cm) octagonal box.
  • Single-gang box (except relay or isolator base).
  • With B200SR base, use an appropriate junction box.
  • With B224RB or B224BI base, use a 3.5” (8.89cm) octagonal box, or a 4.0” (10.16cm) octagonal or square box.
1) Because of inherent supervision provided by the SLC loop, end-of-line resistors are not required. Wiring “T-taps” or branches are permitted for style 4 (Class “B”) wiring.
2) When using relay or sounder bases, consult data sheet DN-2243 (ISO-X) for device limitations between isolator modules and isolator bases.

Agency Listings and Approvals
These listings and approvals apply to the modules specified in this document. In some cases, certain modules or applications may not be listed by certain approval agencies, or listing may be in process. Consult factory for latest listing status.
  • UL Listed: S1115
  • ULC Listed: S1115 (FSP-851A, FSP-851TA)
  • MEA Listed: 225-02-E
  • FM Approved
  • CSFM: 7272-0028:206
  • Maryland State Fire Marshal: Permit # 2122
  • BSMI: CI313066760036
  • CCCF: Certif. # 2004081801000017 (FSP-851T)
    Certif. # 2004081801000016 (FSP-851)
  • Lloyd’s Register: 03/60011

F110: Retrofit replacement flange for older style bases. Converts older high profile base for use with FlashScan detectors.

RA100Z(A): Remote LED annunciator. 3-32VDC. Fits U.S. single-gang electrical box. Supported by B710LP(A) and B501(A) bases only.

SMK400E: Surface mounting kit provides for entry of surface wiring conduit. For use with B501(A) base only.

RMK400: Recessed mounting kit. For use with B501(A) base only.

SMB600: Surface mounting kit for use with B710LP(A).

BCK-200B: Black detector covers, box of 10. For use with FSP-851 only.

WCK-200B: White detector covers, box of 10. For use with FSP-851 only.

M02-04-00: Test magnet.

M02-09-00: Test magnet with telescope stick.

XR2B: Detector removal tool. Allows installation and/or removal of FlashScan Series detector heads from base in high ceiling installations.

T55-127-010: Detector removal tool without pole.

XP-4: Extension pole for XR2B. Comes in three 5-ft. sections.

    Download PDF Download PDF   
    border="0" Printable Page  
    Email Email This Page  
    Save To Favorites Save To Favorites


Product Line Information - Honeywell FSP-851 Smoke Detectors
(PDF, 50KB)

 Fire Alarm System Services 

Fire Alarm Service
Fire Alarm System Services

Site Created by Thomas Web Solutions and powered by Navigator Platform