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Honeywell Fire Sentry FS24X

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Honeywell Fire Sentry FS24X


Honeywell Fire Sentry FS24X


Honeywell Fire Sentry FS24X Multi-Spectrum Triple IR Fire and Flame Detector

Fire Sentry FS24X™ is a quantum leap in flame and fire detection with its sophisticated software and detection technology.

The Fire Sentry FS24X™ is the latest generation high technology Multi-Spectrum Triple IR (IR/IR/IR/Visible) Fire and Flame Detector, which is part of our FSX family of advanced technology Electro-Optical fire detectors. Using our patented* WideBand IR™, WideBand 4.3 micron IR™ and Visible detection technology, the Fire Sentry FS24X™ is a quantum leap in flame and fire detection. Sophisticated software algorithms and dual microprocessors ensure that the Fire Sentry FS24X™ has the highest fire detection performance combined with optimal false alarm rejection.

The WideBand IR™ Infrared technology using high-speed solid-state Quantum sensors allows detection of all types of fires, Hydrocarbon and non-Hydrocarbon, in all weather conditions. If the detector’s signal is blocked by ordinary window glass, the patented WideBand IR sensors will still alarm to the fire albeit at a reduced sensitivity and slower response time.

Dual microprocessors provide a high level of fail-safe operation combined with fast and reliable performance. The master microprocessor performs high-speed digital sampling and signal-processing calculations, while the slave microprocessor handles various sensor data, performs communications, self-diagnostics and provides interface versatility and additional memory for storing Event Log and FirePic™ data.

The Fire Sentry FSX family of detectors feature our patented* FirePic data storage and information retrieval facility. FirePic™ records pre-fire data, which can be recovered from the detector’s non-volatile flash memory for post fire analysis and postulation of the fire cause. Additionally, unique Real-Time Graphing (RTG™) allows viewing of the data which the detector actually sees. A combination of outputs makes the Fire Sentry FS24X™ a truly versatile detector for today’s demanding industrial requirements.

The Fire Sentry FS24X™ detector has a detection range greater than 61m (200 feet) (Very High Sensitivity setting) for the detection of a 0.093m2 (one square-foot) Heptane reference fire and has a cone of vision far greater in volumetric coverage than any other Multi-Spectrum IR detector. This means fewer detectors can be used as compared to other manufacturers’ detectors.

•  Patented* WideBand IR™ technology
•  Patented* Electronic Frequency Analysis™
•  Visible sensor for optimum false alarm rejection
•  Selectable detection sensitivities
•  Field-of-View: 110° full 100% cone-of-vision
    (90° full 100% cone-of-vision model also available)
•  Dual microprocessors for reliable performance
•  Real-time clock for accurate time dating of events
•  FirePic™ — pre-fire event data storage
•  Event log with date and time stamp
•  RS-485 ModBus communication
•  Non-Isolated 4-20 mA Analog output (sink or source)
•  Alarm, Fault and Fire Verification relays
•  Automatic optical path and electronic self-test
•  Wide operating temperature range
•  Patented* Electronics Module for components protection with 
    easy plug-in terminations and field installation
•  Two 25 mm or ¾” NPT conduit entries
•  Low power consumption
•  High RFI and EMI immunity
•  FM, ATEX, CE mark approvals
•  Meets SIL 2 requirements

•  Detects hydrocarbon and non-hydrocarbon fuel fires in all 
    environmental conditions
•  User selectable outputs
•  Optimal false alarm rejection for environmental conditions
•  Minimal maintenance for trouble-free operation
•  PC software and Interface Module (FSIM) for fault diagnostics, 
    real-time graphics (RTGs), and downloading of FirePics™ and event log
•  Suitable for a wide variety of applications
•  Easy electronics module replacement
•  Test lamps for manual testing

•  Refineries and oil production facilities
•  Off-shore platforms
•  Turbine/Compressor enclosures
•  Oil and gas pipelines and pumping stations
•  LNG/LPG loading and unloading facilities
•  Natural gas and CNG plants
•  Ethanol, Methanol, and IPA production and storage
•  Crude oil and gasoline storage and tank farms
•  Aircraft hangars
•  Hydrogen plants and storage
•  Paint and solvent storage
•  Chemical production, storage, and loading facilities
•  Power plants


General Specifications

Field of view

  • FS24X-9: 90° cone of vision, ± 45° from on axis
  • FS24X-2: 110° cone of vision, ± 55° from on axis


  • Very high (200 ft.), high (150 ft.), medium (100 ft.) and low (50 ft.) - switch selectable

Response time

  • 3-5 seconds to 1 sq. ft. n-Heptane fire at 30 m (100 ft.)
  • 3-10 seconds to (1 sq. ft. n-Heptane fire at 60 m (200 ft.)

Spectral sensitivity

  • Visible: 400 – 700 nanometres
  • Near Band IR: 0.7 – 1.1 microns
  • Wide Band IR: 1.1 – 3.0 microns
  • Wide Band IR: 3.0 – 5.0 microns

Operating voltage

24 Vdc nominal (18-32 Vdc) - regulated

Power consumption

  • Operating: 56 mA @ 24 Vdc nominal
  • Alarm: 106 mA @ 24 Vdc nominal
  • Heater: 155 mA – additional
  • Note: Heater will turn on at 0ºF (-17ºC)

Output relays

  • Fire Alarm: SPDT (NO / NC) – De-energized/energized, latching/non-latching
  • Fault: SPST (NO) – De-energized, latching/non-latching
  • Auxiliary: SPDT (NO / NC) – De-energized/energized, latching/non-latching
  • Contacts rating: 1 amp @ 24 Vdc

Analog output

  • 0 - 20 mA stepped - source or sink user selectable

Loop resistance

  • 50 - 400 Ohms


  • One of the following – user selectable:
          • RS-485, ModBus Protocol
          • RS-485, FireBus II
          • HART, Optional plug-in module (not available on EN54-10 units)

Visual indications

  • Green LED: Power
  • Red LED: Alarm
  • Yellow LED: Fault

Temperature range

  • Operating: 110° Field of View FS24X: -40ºF to +185ºF (-40ºC to +85ºC); 90° Field of View FS24X: -60°C to +85°C (-76°F to +185°F) Storage: -67ºF to +230ºF (-55ºC to +110ºC)

Humidity range

  • 5 to 98% relative humidity, non-condensing


  • Meets or exceeds MilSpec 810C Method 514.2, Curve AW12


  • 14 AWG to 22 AWG; shielded cable recommended

Conduit entries

  • Standard: Two M25 or two ¾" NPT

Enclosure materials

  • Copper-free powder coated aluminum or 316 stainless steel

Enclosure type

  • IP66 and NEMA 4 & 4X


FM: Class I, Div. 1 & 2, Groups B, C, & D; Class II, Div. 1 & 2, Groups E, F, & G; Class III ATEX/IECEx: II 2 G Ex db IIC T4 (Ta: -60 to +110°C), T5 (Ta: -60 to +75°C), T6 (Ta: -60 to +60°C), II 2 D Ex tb IIIC T135°C (FS24X-9, 90° Field of View) II 2 G Ex db IIC T4 (Ta: -40 to +110°C), T5 (Ta: -40 to +75°C), T6 (Ta: -40 to +60°C), II 2 D Ex tb IIIC T135°C (FS24X-2, 110° Field of View) : Complies with EN6100-6-4 & EN50130-4 INMETRO CU-TR SIL Rating: FMEDA available on request EN54-10: FS24X-9 certified 1175a/02 (LPCB); CPR 0832-CPR-F0516

Shipping weight

  • Aluminum: 1.6 kg (3.6 lbs)
  • Stainless steel: 3.2 kg (7 lbs)


  • Swivel bracket assembly - optional


  • Three years from date of shipping


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