In high-risk industrial environments, detecting a flame is only half the job. The other half is getting that signal — instantly, reliably — to every system that needs to act on it. HazenFire AT-FD02-UVIR3 is an explosion-proof UV/IR3 flame detector engineered to do both.
The Real Challenge in Industrial Flame Detection
In oil and gas facilities, chemical plants, fuel storage areas, power generation sites, and industrial process zones, fire safety isn’t a single device — it’s an interconnected system. The moment open flame is detected, that signal must travel precisely and without delay to the right places:
- Fire alarm control panels
- PLCs and industrial controllers
- DCS systems in process plants
- SCADA and RTU for remote sites
- BMS for facility-level monitoring
- Local alarm panels and extinguishing control systems
A flame detector that can’t communicate effectively with these systems is simply not enough. That’s where HazenFire AT-FD02-UVIR3 sets a new standard.
Dual-Spectrum Detection: UV and IR3 Working Together
HazenFire AT-FD02-UVIR3 uses a combined UV/IR3 optical detection approach — one of the most reliable methods for open flame identification in demanding industrial environments.
| Spectrum | Range |
|---|---|
| Solar-blind Ultraviolet (UV) | 185–260 nm |
| Infrared (IR3) | 3.8–5.0 μm |
By simultaneously monitoring both ultraviolet and infrared flame radiation, the AT-FD02-UVIR3 achieves strong flame detection performance while minimizing false alarms — a critical requirement where unnecessary shutdowns carry serious operational and financial consequences.
Signal Outputs Designed for Industrial System Integration
This is where HazenFire AT-FD02-UVIR3 truly distinguishes itself. It doesn’t just detect flame — it speaks the language of industrial control and monitoring systems through three purpose-built output channels.
4–20 mA Current Loop Output — Continuous Status Monitoring
The MA terminal delivers a standard 4–20 mA analog signal, giving connected systems a real-time view of detector status at all times:
| Signal Level | Detector Status |
|---|---|
| ≤ 2 mA | Fault / Alarm condition |
| 4 mA | Normal operation |
| 20 mA | Fire alarm detected |
End-of-line resistor: 100–600 Ω
This output is ideal for PLC analog inputs, DCS monitoring modules, SCADA data acquisition, and any BMS or RTU platform with current loop capability. It gives operators a live, quantified status — not just an on/off signal.
Fire Alarm Relay Output (FRJK / FRJD) — Alarm Signal Transmission
A normally-open relay contact activates the moment open flame is confirmed. This clean, discrete alarm signal can be wired directly to:
- Fire alarm control panel alarm inputs
- PLC digital input modules
- DCS safety input channels
- BMS alarm interfaces
- Local alarm panels
- Extinguishing control panel inputs
Relay output means zero compatibility issues with existing system architectures — it’s the universal language of industrial safety.
Fault Relay Output (FLJK / FLJD) — Continuous Detector Supervision
The fault relay is normally closed during healthy operation and opens when a detector fault is detected. This distinction is critical:
A system that can tell you it has detected fire is valuable. A system that can also tell you when it’s no longer working correctly is essential.
The fault relay allows your fire alarm panel, PLC, DCS, or BMS to independently supervise detector health — separating genuine fire alarms from device maintenance needs, and ensuring your safety system is never silently offline.
24 VDC Power — Standard Industrial Field Device Compatibility
AT-FD02-UVIR3 operates on 24 VDC with an input range of 18–30 VDC, making it directly compatible with the standard field power infrastructure found across industrial fire alarm and monitoring installations.
Field Wiring Requirements:
- Minimum cable cross-section: 1.0 mm²
- Strip approximately 6 mm of insulation at termination points
- Avoid excessive or insufficient exposed conductor length
- Always disconnect power before wiring
- Verify external wiring for open-circuit or short-circuit conditions before energizing
Integration Across Every Major Platform
Fire Alarm Control Panels
Connect the fire alarm relay as the primary alarm input and the fault relay as the supervision signal. Where analog monitoring is supported, add the 4–20 mA output for continuous status visibility.
PLC and Industrial Control Systems
Route the 4–20 mA signal to an analog input for status monitoring, and both relay outputs to digital inputs for alarm and fault logic. Ideal for:
- Fuel transfer systems
- Generator and diesel rooms
- Process equipment areas
- Industrial production lines
- Utility system monitoring
DCS — Process Plant Integration
Feed detector status into DCS analog input modules via the 4–20 mA output. Relay outputs provide discrete fire alarm and fault signals for alarm management and safety interlocks — enabling control room operators to view flame detection alongside process and safety data in a unified interface.
SCADA and RTU — Remote Site Monitoring
For unmanned facilities, pipeline stations, pump stations, and remote fuel storage, the AT-FD02-UVIR3’s outputs connect cleanly to RTU or remote I/O modules:
HazenFire AT-FD02-UVIR3 detects open flame
4–20 mA or relay output transmits detector status
RTU / Remote I/O receives signal
SCADA displays alarm or fault condition at control center
Operator initiates emergency response procedureBMS — Facility-Level Visibility
In large industrial buildings, energy centers, and mixed-use facilities, the AT-FD02-UVIR3 can feed flame alarm and fault status into BMS relay or analog inputs — adding an important fire detection visibility layer to facility management operations without replacing the primary fire alarm system.
Fire Suppression and Extinguishing Control
Where the project design calls for automatic suppression linkage, the fire alarm relay output can serve as an input to the extinguishing control panel. Final suppression logic — including cross-zone confirmation, time delays, abort controls, and manual release — should be designed by the responsible fire protection engineer in accordance with applicable standards.
Detection Performance: Coverage That System Engineers Can Design Around
Reliable integration starts with reliable detection. Here are the AT-FD02-UVIR3’s tested detection distances:
| 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)
Field of view: 120° cone of vision — wide-area coverage with wall or ceiling mounting options.
Note: Final detector quantity and positioning should be determined based on site layout, flame risk profile, field of view, obstructions, and environmental conditions.
Built for Hazardous Environments — Inside and Out
HazenFire AT-FD02-UVIR3 is designed to perform where conditions are most demanding.
| Specification | Detail |
|---|---|
| Explosion-proof rating | 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 |
Whether exposed to dust, moisture, outdoor weathering, temperature extremes, or explosive atmospheres — the AT-FD02-UVIR3 keeps working reliably alongside your monitoring and safety systems.
Commissioning Checklist
After installation, power up the detector and verify:
Green indicator flashes for ~50 seconds, then turns solid (normal operation confirmed)
24 VDC supply within 18–30 VDC range
Correct +24V / GND polarity
4–20 mA output reading at receiving device (should read ~4 mA in normal state)
Fire alarm relay continuity confirmed with connected panel
Fault relay state confirmed (normally closed in healthy operation)
Detector aiming direction optimized for coverage area
Connected panel or monitoring system acknowledges alarm and fault signals correctly
Always notify responsible personnel and disable safety interlocks in the protected area before performing functional tests.
Long-Term Reliability: Maintenance That Protects Your Integration
A flame detector in a safety system is only as reliable as its last maintenance check. HazenFire recommends:
- At minimum once per year: Clean the optical window and perform a full functional test
- Dust removal: Soft cloth or compressed air only — never abrasive materials
- Oil or contamination: Clean with alcohol and a lint-free cloth
- System check: Verify that the connected fire alarm panel, PLC, DCS, SCADA, or BMS correctly receives alarm and fault signals after any maintenance activity
AT-FD02-UVIR3 at a Glance: Engineering Value Summary
| Feature | Specification |
|---|---|
| Detection method | UV (185–260 nm) + IR3 (3.8–5.0 μm) |
| Power input | 24 VDC (18–30 VDC range) |
| Analog output | 4–20 mA (fault / normal / fire alarm states) |
| Fire alarm output | Relay, normally open |
| Fault output | Relay, normally closed |
| Field of view | 120° cone of vision |
| Mounting options | Wall or ceiling |
| Explosion-proof | Ex db IIC T6 Gb / Ex tb IIIC T80°C Db |
| Ingress protection | IP66 / IP67 |
| Operating temperature | -40°C to +70°C |
| Compatible systems | Fire alarm panels, PLC, DCS, SCADA, BMS, RTU, extinguishing control |
The HazenFire Difference: Detection + Integration, Engineered Together
For engineers and system integrators specifying flame detection for industrial fire safety systems, the AT-FD02-UVIR3 delivers what matters most: fast, accurate flame detection combined with practical, versatile signal outputs that connect cleanly to every major platform in your safety architecture.
When the signal has to get through — HazenFire gets it there.
HazenFire — Industrial Flame Detection. Total System Integration.
