Conveyor belt systems are widely used in mining, coal handling, power plants, cement plants, ports, recycling facilities, warehouses and heavy industrial production lines. Unlike a small enclosed room, a conveyor system is usually long, moving, dusty, mechanically active and sometimes installed in open or semi-open environments.
This makes conveyor belt fire detection more challenging. A fire may start from belt friction, overheated rollers, seized bearings, electrical faults, material build-up, hot particles, combustible dust or burning material carried on the belt. Once open flame appears, the fire can spread along the belt surface, transfer station or conveyor gallery very quickly.
For this reason, conveyor belt fire protection should not only focus on detecting smoke after a fire has developed. In many high-risk conveyor applications, detecting flame at critical points can provide faster alarm response and better support for emergency shutdown or fire protection linkage.
Traditional smoke detectors are useful in many indoor fire alarm systems, but conveyor belt environments often create conditions where smoke detection alone may not be enough.
In conveyor galleries, transfer points and outdoor conveyor sections, smoke may be affected by:
A conveyor belt fire may produce flame and radiant energy before smoke reaches a conventional detector in sufficient concentration. This is why UV/IR flame detection is an important option for high-risk conveyor fire detection, especially at locations where open flame may be visible and fast response is required.
The ANWETECH AT-FD01-UVIR2 is a compact UV/IR flame detector designed for fast flame detection with strong immunity to false alarms. It combines a solar-blind UV sensor and a narrow-band IR sensor with a built-in 32-bit microprocessor and composite signal-processing algorithm.
For conveyor belt fire detection, this product is not used as a general smoke detector. Its role is to detect flame radiation at high-risk conveyor locations where a fire may appear quickly and where the detector has a clear line of sight to the protected hazard.
The detector is especially suitable for harsh industrial environments because it is designed with explosion-proof construction, high ingress protection and corrosion-resistant housing treatment.
A UV/IR flame detector detects optical radiation produced by flame. The UV sensor responds to ultraviolet radiation, while the IR sensor verifies the infrared flame signature.
The engineering value of UV/IR detection is not only fast flame response. It is also the dual-signal confirmation logic. In a conveyor environment, there may be sunlight, hot surfaces, lamps, welding activity, dust and other interference sources. By combining UV and IR sensing with signal processing, AT-FD01-UVIR2 helps identify real flame conditions while reducing unwanted alarms from common environmental interference.
For conveyor belt systems, this is important because false alarms may stop production, trigger emergency procedures, activate alarm devices or cause unnecessary maintenance inspection. Reliable flame confirmation is therefore both a safety requirement and an operational requirement.
In a conveyor belt system, flame detection should be considered mainly at high-risk locations, not randomly along the entire conveyor route.
Typical locations include:
The drive pulley area contains motors, gearboxes, rotating parts and mechanical stress points. Belt slippage or friction can create heat and may develop into flame if not controlled.
Material build-up, belt misalignment and friction may occur near the tail pulley. If flame appears in this area, fast optical detection can help reduce fire spread.
Transfer points often contain dust, falling material, impact areas and mechanical structures. They are among the most important positions for conveyor fire detection design.
Combustible material, hot particles or burning material may enter the conveyor at loading areas. A UV/IR flame detector can monitor visible flame risk where a clear viewing angle is available.
Crusher houses and processing equipment may produce dust, vibration and mechanical heat. Flame detection can be considered where open flame risk exists near conveyor discharge or transfer areas.
Outdoor conveyors may not be suitable for ordinary smoke detection because smoke can be diluted or blown away. UV/IR flame detection is more practical where flame visibility can be maintained.
The following technical characteristics are important when evaluating AT-FD01-UVIR2 for conveyor belt fire detection projects:
| Item | Manual-Based Technical Detail |
|---|---|
| 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 |
| Kerosene Detection Distance | 35 m for 1 ft × 1 ft flame |
| Ethanol Detection Distance | 30 m for 1 ft × 1 ft flame |
| Methane Detection Distance | 30 m for 70 cm-high flame |
| Paper Detection Distance | 30 m for 1 ft × 1 ft flame |
| Response Time | n-Heptane flame ≤ 10 s |
| 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 |
| Storage Temperature | -40°C to +85°C |
| Humidity Range | 0–96% RH non-condensing; short-term 100% condensing humidity |
| Housing Material | Aluminum alloy with anti-corrosion resin coating |
| Electrical Connection | 1 × NPT 3/4 |
| Dimensions | 120 mm × 95 mm × 85 mm |
| Weight | 0.7 kg |
| Accessory | Cast aluminum bracket |
These parameters show that AT-FD01-UVIR2 is designed for industrial flame detection where the site requires fast response, wide-angle monitoring, harsh-environment protection and reliable alarm output.
A practical conveyor belt UV/IR flame detection arrangement may include the following components:
Installed at selected conveyor risk points to detect visible flame radiation.
Used to mount the detector and adjust the viewing angle toward the protected hazard.
The detector operates on 24 VDC power within the 18–30 V range.
The fire alarm relay provides a normally open contact for fire alarm signal transmission.
The fault relay provides a normally closed contact during normal operation and opens when a fault alarm occurs.
The relay output can be connected to the project’s fire alarm or control equipment according to the site design. In a conveyor system, the alarm signal may be used for local alarm indication, remote monitoring, conveyor shutdown or approved fire protection linkage.
AT-FD01-UVIR2 uses a simple terminal wiring structure:
| 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 |
For conveyor belt fire detection, the fire alarm relay can be used to send an alarm signal to the fire alarm control panel, addressable input module, PLC or local control system. The fault relay helps supervise detector fault conditions, supporting safer maintenance and system monitoring.
This makes AT-FD01-UVIR2 suitable for projects where flame detection must be integrated into a wider conveyor safety or fire alarm architecture.
AT-FD01-UVIR2 is suitable when the conveyor belt fire detection design requires:
It is especially suitable for conveyor applications involving combustible materials, fuel-related areas, dust-prone industrial sites, outdoor conveyor sections, transfer stations and machinery areas where flame may be visible.
However, as an optical flame detector, it requires a clear line of sight to the protected hazard. If the possible flame source is hidden behind equipment, covered by material, blocked by conveyor structures or located inside enclosed machinery, the flame detector should not be treated as the only detection method. The final fire detection design should be based on the actual conveyor layout and hazard assessment.
The detector’s fast response to flame helps support early warning when open flame appears at conveyor risk points.
The 120° cone of view allows the detector to cover a wide visible area when installed at the correct angle.
With IP66/IP67 protection, aluminum alloy housing and anti-corrosion resin coating, the detector is suitable for dusty, humid, outdoor and demanding industrial environments.
The explosion-proof rating supports use in hazardous gas or dust atmospheres where the project requires explosion-proof flame detection equipment.
The fire alarm and fault relay contacts make it practical to connect the detector with fire alarm control panels, input modules, PLC systems or other monitoring equipment.
The UV/IR dual-sensor design and composite signal processing help reduce false alarms from common interference sources, which is important for conveyor systems where an alarm may trigger shutdown or emergency response.
AT-FD01-UVIR2 can be considered for conveyor belt fire detection in:
The detector is most valuable at critical conveyor points where flame can appear quickly and where fast optical detection is needed.
