Conveyor belts are the arteries of heavy industry — moving coal, ore, cement, grain, and bulk materials across mines, power plants, ports, and factories around the clock. But beneath that constant motion lies a serious, often underestimated fire risk. And when a conveyor belt catches fire, it doesn’t smolder politely. It spreads — fast.
That’s why Hazenfire’s HZ-FD01-UVIR2 UV/IR Flame Detector exists. Built specifically for the brutal realities of industrial conveyor environments, it detects open flame in under 10 seconds — before a spark becomes a catastrophe.
Why Conveyor Belt Fire Detection Requires a Different Approach
Conveyor systems aren’t like ordinary rooms. They stretch hundreds of meters, pass through tunnels and open yards, move constantly, generate dust, and operate under mechanical stress every hour of every day.
Fire can ignite from multiple sources:
- Belt friction from slippage or misalignment
- Overheated rollers or seized bearings
- Electrical faults along the drive system
- Hot particles or burning material carried on the belt
- Material build-up at transfer points creating heat pockets
Once open flame appears, it travels rapidly along the belt surface, through transfer stations, and into conveyor galleries. A system designed for a standard indoor environment simply cannot keep up with that kind of threat.
Why Ordinary Smoke Detectors Fall Short on Conveyor Systems
Smoke detectors are valuable — but in conveyor environments, they face serious limitations that can cost precious response time.
In conveyor galleries, transfer points, and outdoor sections, smoke detection is undermined by:
- Air movement from ventilation systems or outdoor wind dispersing smoke before it reaches sensors
- Dust clouds generated by transported materials masking or mimicking smoke signals
- Large open spaces around the conveyor route causing smoke to dilute rapidly
- Delayed smoke accumulation in high-ceiling or semi-open structures
- High installation heights keeping detectors far from the actual hazard
- Mechanical obstructions — structures, chutes, and frames that physically block smoke flow
- Harsh conditions around motors, rollers, and transfer chutes causing sensor interference
Here’s the critical insight: a conveyor belt fire may produce visible flame and intense radiant energy before smoke ever reaches a conventional detector in usable concentration. That’s why UV/IR flame detection isn’t just an option for high-risk conveyor systems — it’s the right engineering choice.
Introducing the Hazenfire HZ-FD01-UVIR2 UV/IR Flame Detector
The Hazenfire HZ-FD01-UVIR2 is a compact, industrial-grade UV/IR flame detector engineered for fast flame detection with strong immunity to false alarms.
It combines two sensing technologies working in tandem:
- A solar-blind UV sensor that responds to the ultraviolet radiation produced by open flame
- A narrow-band IR sensor that verifies the infrared flame signature
Together, they confirm real flame — not sunlight, not hot surfaces, not welding arcs — using a built-in 32-bit microprocessor and composite signal-processing algorithm.
For conveyor belt fire detection, the HZ-FD01-UVIR2 is not a general smoke detector. Its role is targeted and precise: detect flame radiation at high-risk conveyor locations where fire can appear quickly and where the detector has a clear line of sight to the hazard.
Its explosion-proof construction, high ingress protection (IP66/IP67), and corrosion-resistant housing make it purpose-built for the dusty, humid, outdoor, and mechanically aggressive environments that conveyor systems demand.
How UV/IR Dual-Sensing Works — and Why It Matters
The engineering value of UV/IR detection goes beyond raw speed. It’s the dual-signal confirmation logic that truly sets it apart.
In a conveyor environment, interference sources are everywhere — sunlight, heat lamps, welding activity, hot equipment surfaces, and suspended dust. A single-sensor detector may trigger false alarms from any of these.
By requiring both the UV and IR signals to confirm flame simultaneously, the HZ-FD01-UVIR2 dramatically reduces unwanted alarms — which matters enormously in industrial operations. A false alarm on a conveyor system doesn’t just cause inconvenience. It can:
- Shut down production lines
- Trigger emergency procedures
- Activate suppression systems unnecessarily
- Cause costly maintenance inspections
Reliable flame confirmation is therefore both a safety requirement and an operational one. Hazenfire’s dual-spectrum design delivers both.
Where to Deploy UV/IR Flame Detection Along a Conveyor System
Flame detection should be concentrated at high-risk locations, not scattered randomly along the route. Key deployment points include:
Drive Pulley Area
Motors, gearboxes, and rotating parts create mechanical stress. Belt slippage or friction can generate heat that escalates to open flame if undetected.
Tail Pulley Area
Material build-up, belt misalignment, and friction near the tail pulley are common ignition triggers. Fast optical detection here can prevent fire from spreading.
Transfer Stations
Transfer points concentrate dust, falling material, impact forces, and mechanical structures — making them among the highest-priority locations for flame detection.
Loading and Unloading Points
Combustible material, hot particles, or burning material entering the conveyor at loading areas can be monitored where a clear viewing angle is available.
Crusher Houses and Processing Areas
Dust, vibration, and mechanical heat are constants. Flame detection should be considered wherever open flame risk exists near discharge or transfer zones.
Outdoor Conveyor Sections
Wind and open air make smoke detection unreliable outdoors. UV/IR flame detection is the practical choice wherever flame visibility can be maintained.
Technical Specifications — Hazenfire HZ-FD01-UVIR2
| Item | Specification |
|---|---|
| Product Type | UV/IR Flame Detector |
| UV Spectrum Range | 185–260 nm |
| IR Spectrum Range | 4.3–5.0 μm |
| n-Heptane Detection Distance | 40 m for 1 ft × 1 ft flame |
| Gasoline Detection Distance | 35 m for 1 ft × 1 ft flame |
| Diesel Detection Distance | 35 m for 1 ft × 1 ft flame |
| Response Time | ≤ 10 seconds (n-Heptane flame) |
| Cone of View | 120° |
| Explosion-Proof Rating | Ex db IIC T6 Gb / Ex tb IIIC T80°C Db |
| Ingress Protection | IP66 / IP67 |
| Nominal Voltage | 24 VDC, 18–30 V |
| Operating Current | ≤ 50 mA |
| Operating Temperature | -40°C to +70°C |
| Housing Material | Aluminum alloy with anti-corrosion resin coating |
| Dimensions | 120 mm × 95 mm × 85 mm |
| Weight | 0.7 kg |
| Accessory | Cast aluminum bracket |
System Components for a Complete Conveyor Flame Detection Setup
A practical Hazenfire conveyor belt UV/IR flame detection arrangement includes:
1. HZ-FD01-UVIR2 UV/IR Flame Detector
Installed at selected high-risk conveyor points to detect visible flame radiation instantly.
2. Cast Aluminum Mounting Bracket
Adjustable bracket for precise viewing angle alignment toward the protected hazard zone.
3. 24 VDC Power Supply
Stable power within the 18–30 V operating range for consistent detector performance.
4. Fire Alarm Relay Output
Normally open contact for fire alarm signal transmission to control panels or PLCs.
5. Fault Relay Output
Normally closed contact during normal operation — opens immediately when a fault alarm occurs, supporting proactive maintenance.
6. Fire Alarm Panel, Input Module, PLC or Control System
Relay output connects to the project’s fire alarm or control equipment. In conveyor systems, this can drive local alarm indication, remote monitoring, conveyor shutdown, or full fire protection linkage.
Terminal Wiring — Simple and Straightforward
The HZ-FD01-UVIR2 uses a clean terminal wiring structure for easy integration:
| Terminal | Function |
|---|---|
| +24V | 24 VDC power supply positive |
| GND | 24 VDC power ground |
| FRJK | Fire alarm relay normally open contact |
| FRJD | Fire alarm relay common contact |
| FLJK | Fault relay normally closed contact |
| FLJD | Fault relay common contact |
The fire alarm relay connects to fire alarm control panels, addressable input modules, PLCs, or local control systems. The fault relay supervises detector health — supporting safer maintenance and continuous system monitoring.
Key Benefits for Conveyor Belt Fire Protection
Fast Alarm for Open Flame Risk
A response time of ≤ 10 seconds means the system triggers early warning the moment open flame appears at a conveyor risk point — before damage can spread.
Wide Area Monitoring
The 120° cone of view allows a single detector to cover a broad visible area when positioned at the correct angle, reducing the number of units needed.
Built for Harsh Conveyor Environments
IP66/IP67 protection, aluminum alloy housing, and anti-corrosion resin coating mean the HZ-FD01-UVIR2 performs reliably in dusty, humid, outdoor, and demanding industrial conditions.
Explosion-Proof for Hazardous Zones
The explosion-proof rating supports safe deployment in hazardous gas or dust atmospheres — critical in coal, chemical, and fuel-related conveyor applications.
Seamless Relay Integration
Fire alarm and fault relay contacts make connection to fire alarm panels, PLC systems, and monitoring platforms straightforward — no complex retrofitting required.
Reduced Operational Risk from False Alarms
UV/IR dual-sensor design with composite signal processing filters out interference from sunlight, heat sources, and industrial equipment — protecting production continuity.
Industries and Applications
The Hazenfire HZ-FD01-UVIR2 is the right choice for conveyor belt fire detection across:
- Mining conveyor systems
- Coal handling conveyors
- Power plant conveyor galleries
- Cement plant conveyors
- Port and terminal bulk material conveyors
- Recycling and waste handling conveyors
- Biomass handling systems
- Industrial material transfer lines
- Chemical and fuel-related conveyor areas
- Outdoor conveyor routes in harsh environments
The detector delivers maximum value at critical conveyor points where flame can appear quickly and where fast optical detection makes the difference between a minor incident and a major disaster.
A Note on Optical Detection Design
As an optical flame detector, the HZ-FD01-UVIR2 requires a clear line of sight to the protected hazard. Where possible flame sources are hidden behind equipment, covered by materials, or located inside enclosed machinery, flame detection should be combined with complementary detection methods. The final fire detection design should always be based on the actual conveyor layout and a thorough hazard assessment.
Hazenfire’s engineering team is available to assist with site-specific design and detector placement planning.
Protect Your Conveyor Before the Next Ignition
Conveyor belt fires don’t give warnings. They ignite, they spread, and they cause damage that shuts operations down for days or weeks. The Hazenfire HZ-FD01-UVIR2 gives your facility the speed, reliability, and environmental toughness to catch open flame before it becomes a crisis.
Contact Hazenfire today for product specifications, system design support, or a site consultation.
