FS24X Flame Detector Triple IR

The FS24X Flame Detector Tripe IR is the latest generation high technology Multi-Spectrum Triple IR (IR/IR/IR/Visible) Flame Detector, which is part of our FSX family of advanced technology Electro-Optical fire detectors. Using patented WideBand IR, WideBand 4.3 micron IR, and Visible detection technology, the FS24X is a quantum leap in flame detection.

Sophisticated software algorithms and dual microprocessors ensure that the FS24X has the highest fire detection performance combined with optimal false alarm rejection. The WideBand IR Infrared technology uses high-speed solid-state Quantum sensors, and this 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 but 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 FSX family of detectors feature 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 that the Detector actually sees. A combination of outputs makes the FS24X a truly versatile detector for today’s demanding industrial requirements.

The FS24X Flame Detector has a detection range greater than 200 feet (Very High Sensitivity setting) for the detection of a 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.

FS24X-Flame-Detector Triple IR

FS24X Flame Detector Triple IR Specifications Features

  • Detects hydrocarbon and non-hydrocarbon fuel fires in all environmental conditions
  • User selectable outputs
  • Optimal false alarm rejection for all 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
  • 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
  • Widest operating temperature range
  • Patented* Electronics Module for components protection with easy plug-in terminations and field installation
  • Two ¾” NPT OR 25mm conduit entries
  • Low power consumption
  • High RFI and EMI immunity
  • FM, ATEX, CE mark approvals
  • Meets SIL 2 requirements

FS24X Flame Detector Triple IR 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 (60m), high (45m), medium (30m) and low (15m) – switch selectable

Response Time

3-5 Seconds to 0.1 m2 n-Heptane fire at 30 m

3-10 Seconds to 0.1 m2 n-Heptane fire at 60 m

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 -17ºC (0ºF)

Output Relays

Fire Alarm: SPDT (NO / NC) – De-energised/energized, latching/non-latching

Fault: SPST (NO) – De-energised, latching/non-latching

Auxiliary: SPDT (NO / NC) – De-energised/energised, 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
  • RS-485 Special (optional)
  • HART, Optional plug-in module (not available on EN54-10 units)
Visual Indicators

Green LED: Power

Red LED: Alarm

Yellow LED: Fault

Temperature Range

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

Storage: -55ºC to +110ºC (-67ºF to +230ºF)

Humidity Range

5 to 98% relative humidity, non-condensing


Meets or exceeds MilSpec 810C Method 514.2, Curve AW12


2.5 mm2 (14 AWG) to 0.326 mm2 (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

4X, IP66 and NEMA 4

Shipping Weight

Aluminum: 1.6 kg (3.6 lbs)

Stainless Steel: 3.2 kg (7 lbs)


Swivel bracket assembly – optional


Three years from the date of shipping