Space Age D371 3IR+UV Multi-Spectrum Flame Detector

The Space Age D371 3IR+UV Multi-Spectrum Flame Detector is an advanced optical flame detector engineered to provide fast and reliable fire detection in hazardous industrial environments. Utilizing three infrared (3IR) sensors combined with ultraviolet (UV) detection, the Space Age D371 accurately detects hydrocarbon, non-hydrocarbon, and hydrogen fires while providing exceptional immunity to false alarms. Therefore, it is an ideal solution for critical fire protection applications where rapid detection and dependable performance are essential.

Space Age D371 3IR+UV Flame Detector Function

The Space Age D371 continuously monitors its protected area using advanced multi-spectrum optical sensing technology. As a result, it can detect open flames within seconds and activate connected fire alarm systems, suppression systems, or emergency shutdown controls. In addition, sophisticated Digital Signal Processing (DSP) and proprietary detection algorithms distinguish genuine fire signatures from nuisance sources such as sunlight, welding arcs, hot equipment, and reflected infrared energy.

Multi-Spectrum 3IR + UV Detection

The D371 combines three infrared sensing bands with ultraviolet flame detection to maximize detection performance while minimizing false alarms. Consequently, the detector responds quickly to hydrocarbon, non-hydrocarbon, and hydrogen fires over long distances. Moreover, it can detect a standard 12-inch × 12-inch n-heptane fire at distances up to 200 feet (61 meters) under ideal conditions.

Fast Response with High False Alarm Immunity

The D371 utilizes advanced convolution processing and Digital Signal Processing (DSP) technology to analyze flame characteristics in real time. Therefore, typical fire response occurs within 3 to 5 seconds, allowing emergency systems to react quickly while rejecting common false alarm sources including solar radiation, arc welding, hot machinery, and other non-fire optical energy. Furthermore, adjustable sensitivity settings allow the detector to be optimized for various industrial applications.

Explosion-Proof Industrial Construction

The Space Age D371 is housed in a rugged 316 stainless steel explosion-proof enclosure with NEMA 4X, IP66, and IP67 environmental protection. As a result, it is suitable for indoor and outdoor installations in hazardous locations including Class I, Division 1 (Zone 1) environments. Additionally, automatic self-testing continuously verifies optical path integrity and electronic operation for dependable long-term performance.

Flexible System Integration

The D371 supports multiple output options, including alarm, auxiliary, and fault relays, 0–20 mA analog output, and RS-485 Modbus® communication. Consequently, it integrates easily with fire alarm systems, fire suppression systems, PLCs, and industrial automation platforms. Furthermore, onboard memory stores 200 event logs and six FireGraphs®, providing valuable diagnostic information for maintenance and incident analysis.

Technical Specifications

• Model: D371
• Type: Multi-Spectrum Flame Detector
• Detection Technology: 3IR + UV
• Detects: Hydrocarbon, Non-Hydrocarbon, and Hydrogen Fires
• Spectral Sensitivity:
  • UV: 180–260 nm
  • IR: 2–5 microns (3 discrete bands)
• Detection Range:
  • 12″ × 12″ n-Heptane Fire: Up to 200 ft (61 m)
  • Hydrogen Flame: Up to 100 ft (30.5 m)
• Typical Response Time: 3–5 Seconds
• Field of View: 90° Horizontal × 90° Vertical
• Operating Voltage: 24 VDC (18–31 VDC)
• Current Consumption:
  • Standby: 60 mA
  • Alarm: 90 mA
  • Optional Heater: Additional 120 mA
• Outputs:
  • Alarm Relay
  • Auxiliary Relay
  • Fault Relay
  • 0–20 mA Analog Output
  • RS-485 Modbus®
• Event Memory: 200 Event Logs and 6 FireGraphs®
• Self-Test: Automatic Optical Path Integrity Monitoring (OptiRadar®)
• Enclosure: 316 Stainless Steel
• Environmental Rating: NEMA 4X, IP66, IP67
• Operating Temperature: -40°F to +185°F (-40°C to +85°C)
• Operating Humidity: 5–95% RH Non-Condensing
• Hazardous Location: Class I, Division 1 (Zone 1)
• Certifications: FM Approved, CSFM Listed, SIL 2 Compliant
• Made in USA

Applications

The Space Age D371 3IR+UV Multi-Spectrum Flame Detector is ideal for:

• Oil and gas facilities
• Chemical processing plants
• Hydrogen production facilities
• Refineries
• LNG and LPG terminals
• Aircraft hangars
• Power generation plants
• Fuel storage terminals
• Offshore platforms
• Paint and solvent storage facilities
• Industrial manufacturing plants
• Hazardous process environments

Reliable Multi-Spectrum Flame Detection Solution

The Space Age D371 3IR+UV Multi-Spectrum Flame Detector combines advanced multi-spectrum optical sensing, rapid response, exceptional false alarm immunity, and explosion-proof construction in a rugged industrial package. Overall, it provides dependable flame detection for critical industrial applications while supporting fast emergency response and seamless integration with fire alarm, fire suppression, and industrial control systems.

D371 Datasheet