In oil, gas, and chemical environments, fire doesn’t wait — and neither should your detector. Open flame in a hazardous area can escalate from ignition to catastrophe in seconds. HazenFire AT-FD02-UVIR3 is built to identify that threat at the flame stage — fast, reliably, and in the harshest industrial conditions on earth.
When Every Second Counts: The Case for Flame Detection
In oil and gas facilities, fuel storage areas, chemical process zones, and solvent handling rooms, fire risk is fundamentally different from a standard building fire. Flammable liquids, combustible gases, solvent vapors, and high-energy process equipment create an environment where ignition can spread faster than conventional detection methods can respond.
This is why engineers in these sectors specify flame detectors — not just smoke or heat sensors.
| Detection Method | How It Works | Limitation |
|---|---|---|
| Smoke detection | Detects smoke particles | Smoke must travel to the detector first |
| Heat detection | Detects temperature rise | Temperature must build up over time |
| Flame detection | Detects open flame radiation directly | None — responds at the flame itself |
Flame detection identifies fire at its most critical and earliest visible stage — the flame — giving safety systems the fastest possible opportunity to respond.
HazenFire AT-FD02-UVIR3 is engineered precisely for this mission.
Dual-Spectrum Intelligence: UV and IR3 Detection Combined
The AT-FD02-UVIR3 uses a combined UV and infrared optical detection approach — monitoring flame radiation across two distinct spectral bands simultaneously.
| Sensor | Spectrum |
|---|---|
| Solar-blind Ultraviolet (UV) | 185–260 nm |
| Infrared (IR3) | 3.8–5.0 μm |
Why does dual-spectrum matter in industrial environments?
Industrial sites are full of potential false-alarm sources — sunlight, hot equipment surfaces, welding operations, dust, moisture, and process activity. A UV-only detector can be triggered by arc welding or lightning. An IR-only detector can be confused by hot surfaces or solar radiation.
By combining both signals and processing them together, HazenFire AT-FD02-UVIR3 achieves dependable flame identification even in complex, active industrial environments — reducing false alarms without compromising response speed.
The logic is simple: UV detects flame radiation. IR verifies flame characteristics. On-board signal processing ensures it all adds up to a reliable, confirmed alarm — not a false one.
Detection Range: Covering the Distances That Industrial Areas Demand
Large open-risk areas — fuel handling zones, process platforms, storage yards, and equipment bays — require a flame detector with real detection reach. HazenFire AT-FD02-UVIR3 delivers:
| Fuel / Fire Type | Test Size | Detection Distance |
|---|---|---|
| n-Heptane | 0.3 m × 0.3 m | 60 m |
| Gasoline | 0.3 m × 0.3 m | 50 m |
| Diesel | 0.3 m × 0.3 m | 45 m |
| Kerosene | 0.3 m × 0.3 m | 45 m |
| Alcohol | 0.3 m × 0.3 m | 35 m |
| Paper | 0.5 m × 0.2 m | 35 m |
| Methane | 0.7 m high flame | 30 m |
| Hydrogen | 0.7 m high flame | 20 m |
| Silane | 0.7 m high flame | 10 m |
Response time: ≤10 seconds (n-Heptane) | ≤5 seconds (Hydrogen)
Engineering Note: Detection distances are measured under specified test conditions. Final detector placement must account for installation height, aiming direction, line-of-sight obstructions, flame type, ambient conditions, and protected area layout. Always confirm coverage through project layout drawings and site risk analysis.
120° Cone of Vision — Wide-Area Flame Monitoring
A wide detection range is only effective when the detector can actually see the flame. HazenFire AT-FD02-UVIR3 provides a 120° cone of vision, offering broad open-area coverage when correctly installed and aimed.
In oil, gas, fuel storage, and chemical facilities, line-of-sight planning is critical. Tanks, pipework, structural columns, process equipment, and platforms can all create blind spots. Correct detector placement — verified against project layout drawings — ensures every potential flame source falls within the detection envelope.
Mounting options: Wall mount or ceiling mount, with adjustable aiming angle.
Explosion-Proof Where It Matters Most
HazenFire AT-FD02-UVIR3 is purpose-built for hazardous industrial environments — not adapted for them.
| Specification | Detail |
|---|---|
| Explosion-proof marking | Ex db IIC T6 Gb / Ex tb IIIC T80°C Db |
| Ingress protection | IP66 / IP67 |
| Housing material | Aluminum alloy ADC12 |
| Operating temperature | -40°C to +70°C |
IP66/IP67 dual-rated protection means the detector performs reliably against dust ingress, powerful water jets, and temporary immersion — covering everything from desert environments to coastal industrial facilities and washdown areas.
The wide operating temperature range (-40°C to +70°C) ensures consistent performance from arctic-condition fuel terminals to high-ambient process plants.
Certification Note: Explosion-proof markings are as listed in the product manual. For project specification, ATEX, IECEx, UL, or FM certificate numbers should be confirmed directly with HazenFire before submission.
Signal Outputs for Complete Fire Safety Integration
Detection without communication is incomplete. HazenFire AT-FD02-UVIR3 provides three output interfaces designed to connect directly with industrial fire alarm and monitoring systems:
4–20 mA Current Loop Output
Real-time analog status monitoring for PLC, DCS, SCADA, BMS, and RTU systems:
| mA Level | Detector Status |
|---|---|
| ≤ 2 mA | Fault condition |
| 4 mA | Normal operation |
| 20 mA | Fire alarm |
End-of-line resistor: 100–600 Ω
Fire Alarm Relay Output (FRJK / FRJD)
Normally-open contact — activates on confirmed flame detection. Compatible with fire alarm panels, PLC digital inputs, DCS modules, BMS interfaces, and extinguishing control panels.
Fault Relay Output (FLJK / FLJD)
Normally-closed contact — opens on detector fault. Enables continuous supervision of detector health, allowing your system to distinguish between a genuine fire alarm and a device that needs service.
Where HazenFire AT-FD02-UVIR3 Is Specified
Based on its explosion-proof design, long detection range, dual-spectrum sensing, and industrial environmental protection, the AT-FD02-UVIR3 is suited for flame detection projects in:
Oil and gas facilities
Fuel storage and transfer stations
Chemical process areas
Solvent storage rooms
Paint and coating rooms
Diesel generator rooms
Industrial process zones
Hazardous material handling areas
Final product selection should always be confirmed against actual fire risk, hazardous area classification, installation environment, detector siting requirements, applicable local standards, and project specifications.
Installation Best Practices
Correct installation is as important as correct product selection. HazenFire recommends:
Install with a clear, unobstructed line of sight to the protected risk area
Aim according to the 120° cone of vision and site risk layout
Confirm detection distance against expected flame risk and area dimensions
Use trained, competent personnel for installation and commissioning
Disconnect power before any wiring activity
Verify external wiring for open-circuit or short-circuit conditions before energizing
Use cable with minimum cross-sectional area of 1.0 mm²
Strip approximately 6 mm of insulation at termination points
Secure cable glands where applicable
Avoid excessive or insufficient exposed conductor length
Commissioning: What to Verify Before Going Live
After installation, power up the detector and observe:
Normal startup: Green indicator flashes for approximately 50 seconds, then turns solid — confirming the detector is in normal operating condition.
Commissioning checks should include:
- Supply voltage within 18–30 VDC range
- Correct +24V / GND terminal connections
- 4–20 mA output reading ~4 mA at receiving device (normal state)
- Fire alarm relay continuity at connected panel
- Fault relay state confirmed as normally closed
- Detector aiming direction optimized for protected area
- Connected fire alarm panel or monitoring system responds correctly to test signals
Always notify responsible personnel and disable safety interlocks before functional testing. No user-serviceable internal components exist inside the unit — unauthorized adjustment may affect performance or cause damage.
Maintenance: Protecting Detection Performance Long-Term
For optical flame detectors, the condition of the optical window directly affects detection performance. In oil, gas, and chemical environments — where dust, oil mist, and vapor residue are common — regular maintenance is essential.
HazenFire recommends at minimum once per year:
- Clean the optical window with a soft cloth or compressed air (dust)
- For oil contamination: wipe with alcohol and a lint-free cloth
- Never use abrasive or hard objects — optical window scratches permanently degrade performance
- Perform a full functional test after any cleaning activity
- Verify that connected systems (fire alarm panel, PLC, DCS, SCADA, BMS) correctly receive alarm and fault signals
Frequently Asked Questions
What is HazenFire AT-FD02-UVIR3? It is an explosion-proof UV/IR3 point-type flame detector designed for fast, reliable open-flame detection in hazardous industrial environments.
What is the maximum detection distance? Up to 60 m for a 0.3 m × 0.3 m n-Heptane flame under specified test conditions.
What is the field of view? 120° cone of vision, adjustable via mounting angle.
What output signals does it provide? 4–20 mA current loop output, fire alarm relay output (normally open), and fault relay output (normally closed).
Can it integrate with fire alarm panels, PLC, DCS, SCADA, or BMS? Yes — all three output types are designed for integration with compatible industrial fire alarm and monitoring systems, according to project design.
What is the explosion-proof rating? Ex db IIC T6 Gb / Ex tb IIIC T80°C Db, as listed in the product manual. Certification numbers should be confirmed with HazenFire for project specification.
What maintenance is required? Optical window cleaning and functional testing at least once per year, or per site maintenance schedule and applicable standards.
HazenFire AT-FD02-UVIR3 — Quick Specification Summary
| Feature | Specification |
|---|---|
| Detection method | UV (185–260 nm) + IR3 (3.8–5.0 μm) |
| Max detection distance | 60 m (n-Heptane, 0.3 × 0.3 m) |
| Field of view | 120° cone of vision |
| Power input | 24 VDC (18–30 VDC range) |
| Analog output | 4–20 mA |
| Alarm output | Relay, normally open |
| Fault output | Relay, normally closed |
| Explosion-proof | Ex db IIC T6 Gb / Ex tb IIIC T80°C Db |
| Ingress protection | IP66 / IP67 |
| Operating temperature | -40°C to +70°C |
| Mounting | Wall or ceiling |
HazenFire — Open Flame Detection. Engineered for the Harshest Environments.
