Micropack FDS303 – Ex-proof Multi Spectrum IR (MSIR) Flame Detector

Micropack FDS303 is an explosion-proof Multi Spectrum IR (MSIR) flame detector developed for hazardous industries where fast fire detection is critical and false alarms are unacceptable. It delivers high-performance long-range response to hydrocarbon liquid fuel and gas fires.

Micropack FDS303 Ex-proof Multi Spectrum IR (MSIR) flame detector
MSIR: Long range High false alarm immunity Continuous optical self-test (no reflector) 0–20mA + HART® Alarm + Fault Relays EN 54-10 • FM 3260 SIL 2 (IEC 61508)

About the Product

FDS303 uses advanced IR algorithms to detect hydrocarbon flames that may not be visible in the visible spectrum. The design goal is to provide long detection range while also maximizing immunity to false alarms.

Key Advantages

  • Multi Spectrum IR detection: Long-range detection with advanced false alarm immunity.
  • Continuous optical self-test: Ongoing verification without a reflector; helps maximize uptime.
  • Heated optics: Helps maintain performance in harsh weather such as snow, ice and condensation.
  • Adjustable sensitivity: Can be optimized per application; adjustable to help prevent unwanted “cross voting” between detectors.
  • Standard industry outputs: Alarm/Fault relays, 0–20mA and HART® (standard).
  • Easy field testing: External testing with a long-range flame simulator can help reduce the need for scaffolding.

Typical Applications

Suitable for rapid detection of hydrocarbon fires in hazardous and critical areas:

  • Onshore/Offshore oil & gas facilities
  • Refineries
  • Petrochemical plants
  • Chemical plants
  • Pharmaceutical industry
  • Aircraft hangars
  • Road tunnels
  • Power generation facilities
  • Tank farms
  • Road & rail loading racks
  • LNG / LPG areas
  • Warehouses / storage yards
  • Waste recycling / biomass facilities
  • Printing industry

Technical Specifications (Summary)

Item Value
Detector type Multi Spectrum IR (MSIR) Flame Detector
Field of view (FOV) 90° horizontal × 90° vertical
Operating voltage 24 VDC nominal (18–32 VDC)
Power consumption Min 3 W (heater off), up to 15 W at 32 VDC with heater max
Response time Typically 2–5 seconds*
Outputs Alarm + Fault relay contacts (DPDT 2A @ 30VDC), 0–20mA, HART®
Ingress protection NEMA 4X / IP66
Operating temperature -60°C … +85°C
Storage temperature -60°C … +85°C
Humidity 0–100% RH (non-condensing)
Housing / material Copper-free aluminium or 316 stainless steel
Dimensions 100 mm Ø × 200 mm (approx.)
Cable entry 3/4" NPT or M25
Weight Aluminium: 2.5 kg • Stainless steel: 6 kg
Functional safety IEC 61508 — SIL 2 capable
Performance approvals FM 3260 • EN 54-10

* Response time depends on fuel type, fire size and distance.

Flame Sensitivity (Example Fuels / Distances)

The values below show typical detection distances for standard test fuels at High and Standard sensitivity settings as provided in the datasheet.

Sensitivity Fuel Fire Size Distance
High n-Heptane 30×30 cm 60 m
High n-Heptane + arc welding 30×30 cm 60 m
High Gasoline 30×30 cm 60 m
High Diesel 30×30 cm 50 m
High Crude oil (heavy fuel) 0.5×0.5 m 50 m
High JP4 30×30 cm 60 m
High Methane 60 cm flame plume 50 m
High Ethanol 30×30 cm 42 m
High Methanol 30×30 cm 42 m
Standard n-Heptane 30×30 cm 30 m
Standard Gasoline 30×30 cm 30 m
Standard JP4 30×30 cm 30 m
Standard Methane 60 cm flame plume 30 m
Standard Ethanol 30×30 cm 30 m
Certifications, Hazardous Area Approvals & Accessories

Hazardous Area / Certification (Summary)

  • Class I Div 1 Groups B, C, D T4 (Ambient -50°C…+85°C)
  • Class I Zone 1 AEx/Ex db IIC T4 (Ambient -50°C…+85°C)
  • ATEX II 2 G Ex db IIC T4
  • IECEx Ex db IIC T4 (Ambient -60°C…+85°C)
  • INMETRO Ex db IIC T4
  • PESO Ex db IIC T4 (Ta -60°C…+85°C)
  • Ingress: NEMA 4X / IP66
  • IEC 61508: SIL 2 capable
  • Marine: ABS Product Assessment

Accessories (Examples)

  • Flame simulator (FS301)
  • Pole mounting bracket
  • Retrofit mounting bracket
  • Marine mounting bracket

For support on hazardous area classification, cabling and control system compatibility in your project, please contact our sales team.

Documents

Download Datasheet (PDF) All Catalogs Sales Contact

For project / survey support: the application area, sensitivity settings, mounting height and “cross vote” risks should be evaluated together.

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