NOTIFIER Intelligent Plug-In Ionization Smoke Detector FSI-851(A)

The FSI-851(A) intelligent plug-in ion detectors with integral communication has features that surpass conventional detectors.

Intelligent Plug-In Ionization Detector FSI-851 Data Sheet PDF
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The FSI-851(A) intelligent plug-in ion detectors with integral communication has 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 rotary, decimal address switches, providing exact detector locations for selective maintenance when chamber contamination reaches an unacceptable level.

The FSI-851(A) ionization detector incorporates a unique single- source, dual-chamber design to respond quickly and dependably to a broad range of fires. FSI-851(A) detectors are compatible with ONYX series and CLIP series intelligent Fire Alarm Control Panels (FACPs).


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  • Sleek, low-profile design.
  • Addressable-analog communication.
  • Stable communication technique with noise immunity.
  • Low standby current.
  • Two-wire SLC connection.
  • Compatible with FlashScan and CLIP systems
  • Rotary, decimal addressing (1-99 on CLIP systems, 1-159 on FlashScan systems).
  • Optional remote, single-gang LED accessory, RA100Z(A).
  • Dual LED design provides 360° viewing angle.
  • Visible bicolor LEDs blink green every time the detector is addressed, and illuminate steady red on alarm.
  • Remote test feature from the panel.
  • Walk test with address display (an address of 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 plastic, 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, or sounder bases.
  • Listed to UL 268.


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NOTE: “A” suffix indicates ULC Listed model.
FSI-851: Low-profile intelligent ionization sensor. Must be mounted to one of the bases listed below.
FSI-851A: Same as FSI-851 but with ULC Listing.

Intelligent Bases
NOTE: “A” suffix indicates ULC Listed model.
NOTE: For details on intelligent bases, see DN-60054.

  • B210LP(A): Standard U.S. flanged low-profile mounting base.
  • B210LPBP: Bulk pack of B210LP; package contains 10.
  • B501(A): Standard European flangeless mounting base.
  • B501BP: Bulk pack of B501; package contains 10.
  • B200S(A): Intelligent, programmable sounder base capable of producing sound output in high or low volume with ANSI Temporal 3, ANSI Temporal 4, continuous tone, marching tone, and custom tone.
  • B200SR(A): Intelligent sounder base capable of producing sound output with ANSI Temporal 3 or continuous tone. Replaces B501BH series bases in retrofit applications.
    B224RB(A): Plug-in System Sensor relay base. Screw terminals: up to 14 AWG (2.0 mm²). Relay type: Form-C. Rating: 2.0A @ 30 VDC resistive; 0.3 A @ 110 VDC inductive; 1.0 A @ 30 VDC inductive.
  • B224BI(A): Plug-in System Sensor isolator detector base. Maximum 25 devices between isolator base.


  • F110: Retrofit flange to convert B210LP(A) to match the B710LP(A) profile, or to convert older high-profile bases to low-profile.
  • F110BP: Bulk pack of F110; package contains 15.
  • F210: Replacement flange for B210LP(A) base.
  • RA100Z(A): Remote LED annunciator. 3 – 32 VDC. Mounts to a U.S. single-gang electrical box. For use with B501(A) and B210LP(A) bases only.
  • SMB600: Surface mounting kit.
  • M02-04-00: Test magnet.
  • M02-09-00: Test magnet with telescoping handle.
  • XR2B: Detector removal tool. Allows installation and/or removal of detector heads from bases in high ceiling applications.
  • XP-4: Extension pole for XR2B. Comes in three 5-foot (1.524 m) sections.
  • T55-127-010: Detector removal tool without pole.
  • BCK-200B: Black detector covers; package contains 10.
  • WCK-200B: White detector covers; package contains 10.