UV/IR Flame Detector – Combination of One UV Sensor and Three IR Sensors

UV/3IR Flame Detector: Combination of Four Sensors

The FS20X Plus combines one ultraviolet (UV) sensor with three infrared (3IR) sensors. This multiprotocol technology provides enhanced sensitivity and high immunity to false alarms. Even in challenging environments (smoke, fog, rain, or dust), the detector reliably distinguishes between a real fire and external interference

Dual Digital Processing for Maximum Reliability

Two high-performance microprocessors ensure fast and accurate measurements. The primary microprocessor performs high-speed digital sampling and real-time signal processing, while the secondary microprocessor manages self-diagnostics, communication, and event/data logging.

Configurable Detection Range up to 84 Meters

For a reference heptane fire of 0.1 m², the FS20X Plus can detect flames at distances up to 84 meters (275 ft) in “very high” sensitivity mode. Four sensitivity levels allow the detector to be tailored to the specific requirements of each industrial site.

Key Advantages of the UV/IR Flame Detector

• Suitable for detecting hydrogen, hydrocarbons (gasoline, ethanol, methane), paper, wood, and other fire sources
• Dual high-performance microprocessors ensure measurement integrity and short response times
• Immune to arc welding and resistant to false alarms under all environmental conditions
• Four selectable sensitivity levels via switch for optimized performance in each application
• PC software and interface module for diagnostics and downloading of event logs and data
• Visual status indicators: Green (power), Red (alarm), Yellow (fault)
• Minimal maintenance for reliable, error-free operation

Technical Specifications of the FS20X Plus Flame Detector

• Field of View: Oval, 100° horizontal × 90° vertical. 50% of distance along the horizontal axis. FoV can extend up to 120° (±60°).
• Sensitivity: Low 65 ft (20 m), Medium 130 ft (40 m), High 195 ft (59 m), Very High 275 ft (84 m) for 0.1 m² heptane fire – configurable via FlameManager.
• Response Time: Typically 5 seconds, maximum 10 seconds; ≤ 3 seconds under specific conditions.
• Power Supply: 24 Vdc nominal (18–32 Vdc) – Regulated
• Analog Output: 4–20 mA – Source, sink, or isolated
• Communication: Modbus RS-485; FP2: RS-485 or USB
• Relay Outputs: Alarm, Fault, and Auxiliary: SPDT (NO/NC) – enabled/disabled, latching/non-latching. Rated 2 A at 32 Vdc
• Visual Indicators: High-visibility LEDs for easy status monitoring at a distance
• Housing: Low-copper aluminum with marine-grade paint or polished stainless steel CFBM
• Ingress Protection: IP66 / 67 (Type 4X)
• Mounting: Standard SM4 bracket and enhanced SH-002 sunshield
• Operating Temperature: -55 °C to +75 °C
• Humidity Range: 0% to 99% relative humidity
• Weight: Aluminum 1.7 kg (3.7 lb), Stainless Steel 3.4 kg (7.4 lb)
• Certifications 
  ATEX: II 2 G Ex db IIC T5 Gb; II 2 D Ex tb IIIC T135°C Db IP66/67
  IECEx: Ex db IIC T5 Gb; Ex tb IIIC T135°C Db IP66/67
  cFMus: Class I, Div 1 Grps A,B,C,D; Class II/III, Div 1, Grps E,F,G NEMA 4X
  INMETRO, CUTR, CCC

Optical Flame detector