Viking VSF303 Multi-Spectrum IR Flame Detector

The Viking VSF303 is an explosion-proof multi-spectrum IR flame detector. The device delivers superior performance, responding to hydrocarbon liquid fuel and gas fires at long distances. The VSF303 has been tested by Factory Mutual (FM) to detect a hydrocarbon fuel pan fire at 60 m (~ 200 feet) within 5 seconds.


• Comprehensive design and support services provided by Viking Integrated Safety
• Multi-spectrum IR design delivers long detection distances and enhanced false alarm immunity
• Continuous optical test, without a reflector, verifies operation and improves device up-time
• Microprocessor controlled heated-optics maintains operation in harsh weather conditions (snow, ice, condensation)
• International hazardous area approvals: FM / ATEX / IEC Ex
• Certified performance testing to multiple fuels to FM 3260 and EN 54-10
• Adjustable sensitivity levels, for application flexibility and to ensure detectors do not cross vote
• External testing with a long-range flame simulator minimizes the need for scaffolding
• Easy integration using industry-standard outputs: Alarm and Fault Relays; 0-20mA; HART as standard
• Certified SIL 2 capable
• 5-year warranty

Viking Part Numbers

Viking Part = Viking Model :: Suffix :: Housing :: Cable Entry

24598 = VSF303 MSIR :: -NPT :: Aluminum :: ¾” NPT
24365 = VSF303 MSIR :: -M25 :: Aluminum :: M25
24595 = VSF303 MSIR :: -NPT-SST :: Stainless Steel :: ¾” NPT
24367 = VSF303 MSIR :: -M25-SST :: Stainless Steel :: M25


Class 1 Div 1 Groups B, C, D T4
Ambient –50°C to +85°C

Class 1 Zone 1 AEx/Ex db IIC T4
Ambient –50°C to +85°C

ATEX Ex II 2 G Ex db IIC T4
IECEx Ex db IIC T4
Ambient –60°C to +85°C

Ta = –60°C to +85°C

Performance approvals:
FM 3260
EN 54-10

NEMA type 4X / IP66
IEC 61508
Certified SIL 2 Capable

ABS Product Assessment

Operating Specs

Parameter: Min—Max

Range (Depth of Field): 2m—60m
Horizontal Field of View: 90°
Vertical Field of View: 90°
Detector Response Time: 4s—30s
Power-on Reset Delay: 5s
Optical Verification: ON by default

Technical Data & Applications Brochures (EN = English, DE = German)


Contact VIS to get started... 

* = Required Field