Industrial flame detection is not only about sensing open flame. In oil, gas, chemical, fuel storage, power generation and industrial process areas, a flame detector must also provide clear output signals to the site monitoring and safety control system.
For engineering projects, the detector output is an important part of the whole fire safety logic. Once open flame is detected, the signal may need to be sent to a fire alarm control panel, PLC, DCS, SCADA, BMS, RTU, local alarm panel, extinguishing control panel or other industrial monitoring equipment according to the project design.
ANWETECH AT-FD02-UVIR3 is an explosion-proof UV/IR3 flame detector designed for fast and reliable open flame detection in industrial environments. It uses an infrared sensor, a solar-blind ultraviolet sensor and on-board signal processing to improve flame detection performance and false-alarm immunity in demanding industrial applications.
AT-FD02-UVIR3 uses combined UV and IR flame detection. The manual lists the UV spectrum range as 185–260 nm and the IR spectrum range as 3.8–5.0 μm.
This combined optical detection method allows the detector to monitor open flame radiation through both ultraviolet and infrared signals. For industrial fire alarm and safety control systems, this detection method provides a dedicated flame alarm source for areas where open flame risk needs to be identified quickly.
In a complete project, the detector does not work alone. It detects the flame condition, processes the optical signal, and sends output signals to the connected system for alarm indication, supervision or further response logic.
AT-FD02-UVIR3 operates with 24 VDC power input. The operating voltage range is 18–30 VDC. The terminal layout uses +24V and GND as the power supply input.
This power requirement makes the detector suitable for industrial fire alarm and monitoring projects where 24 VDC field devices are commonly used. During installation, the power supply should be disconnected before wiring. The manual also requires external wiring to be checked for open-circuit or short-circuit conditions before the detector is energized.
For stable field wiring, the manual requires cables with a cross-sectional area of at least 1.0 mm². Approximately 6 mm of insulation should be stripped at the wire end before termination. Excessive or insufficient exposed conductor length should be avoided to reduce unreliable connections.
The MA terminal of AT-FD02-UVIR3 provides 4–20 mA current loop output. This output is useful for industrial monitoring systems that need to identify detector operating status through analog signal values.
According to the manual, the 4–20 mA output status is:
End-of-line resistor: 100–600 Ω
Fault alarm: ≤2 mA
Normal operation: 4 mA
Fire alarm: 20 mA
This signal structure allows a compatible receiving device to distinguish between normal condition, fault condition and fire alarm condition.
In industrial projects, the 4–20 mA output can be used for status monitoring by systems such as PLC, DCS, SCADA, BMS, RTU or other monitoring equipment with suitable analog input design. The final connection method should follow the project control logic and receiving equipment requirements.
AT-FD02-UVIR3 provides a fire alarm relay output through FRJK / FRJD. The manual describes this output as a normally-open contact.
This relay output can be used to transmit a fire alarm signal to a compatible fire alarm control panel, PLC digital input, DCS input module, BMS input, local alarm panel, extinguishing control panel or other monitoring device according to the project design.
For many engineering systems, relay output is practical because it provides a clear alarm contact signal. When the detector enters fire alarm condition, the connected system can use this signal for alarm display, local warning, remote monitoring or safety response logic.
AT-FD02-UVIR3 also provides a fault relay output through FLJK / FLJD. The manual states that this output is normally closed during normal operation and opens on fault alarm.
Fault supervision is important in industrial fire detection systems. A flame detector should not only send a fire alarm signal; it should also allow the connected system to identify abnormal detector status.
The fault relay output can be used by fire alarm panels, PLC, DCS, SCADA, BMS or other monitoring systems to supervise detector fault conditions. This helps the project team separate fire alarm status from device fault status and makes maintenance response clearer.
In fire alarm system integration, AT-FD02-UVIR3 can provide both alarm and fault signals to the fire alarm control panel.
The fire alarm relay output can be used as the fire alarm input signal.
The fault relay output can be used as the fault supervision signal.
The 4–20 mA output can be used where the receiving system supports current loop monitoring.
This makes the detector suitable for projects where flame alarm indication and fault supervision are both required. In hazardous industrial areas, this separation is useful because operators need to know whether the system has detected flame or whether the detector itself requires service.
In many industrial projects, flame detection signals may also be sent to a PLC. The PLC can receive detector status through analog or digital inputs depending on the project design.
The 4–20 mA output can be connected to a compatible analog input for status monitoring.
The fire alarm relay can be connected to a digital input for flame alarm signal.
The fault relay can be connected to a digital input for device fault supervision.
This type of integration is useful in fuel transfer systems, generator rooms, process equipment areas, industrial production lines and utility systems where flame alarm signals need to be included in site control logic.
The detector provides the flame alarm and fault signals. The final action, such as alarm display, shutdown, interlock or equipment control, should be defined by the project control system and safety logic.
In chemical plants, oil and gas facilities, refineries and process industries, flame detector signals may be connected to a DCS for centralized monitoring.
The 4–20 mA output can support detector status monitoring through compatible analog input modules. Relay outputs can provide separate fire alarm and fault signals to the DCS or related interface module.
This allows operators in the control room to monitor flame detection status together with other process and safety signals. For process plants, this integration helps combine field fire detection with centralized alarm management.
For remote industrial sites, fuel storage areas, pipeline stations, pump stations or unmanned utility locations, flame detection signals may need to be transmitted to SCADA through RTU or remote I/O modules.
AT-FD02-UVIR3 provides practical signal outputs for this type of system architecture. The 4–20 mA output can be used for analog status monitoring, while the fire alarm relay and fault relay can be used as digital alarm and supervision inputs.
A typical remote monitoring logic can be:
AT-FD02-UVIR3 detects open flame
4–20 mA or relay output sends detector status
RTU or remote I/O receives the signal
SCADA displays alarm or fault condition
Operator follows the site emergency response procedure
This supports flame detection monitoring in industrial locations where local and remote alarm visibility are both required.
In large industrial buildings, energy centers, generator rooms, utility areas and mixed-use facilities, flame detector signals may also be connected to BMS.
The BMS can use relay input or compatible analog input to display detector status. This allows facility operators to monitor flame alarm or detector fault condition from a building or facility management interface.
For BMS integration, the key value is not to replace the fire alarm system, but to provide additional facility-level visibility. The fire alarm system remains the primary fire safety system where required by project design, while BMS can support monitoring, event display and facility management response.
AT-FD02-UVIR3 relay outputs can also be used as part of local alarm or indication circuits when connected through suitable interface modules or control devices.
In industrial projects, local alarm indication may be required near fuel storage areas, diesel rooms, generator areas, pump rooms, process units or control points. The fire alarm relay can provide an alarm signal to a compatible local alarm panel or interface device, while the fault relay can provide a maintenance or trouble signal.
The detector output should not be used to directly drive loads beyond the approved relay rating. If a sounder beacon, warning light, control relay or other external device is required, the design should use a suitable interface module, relay module or control panel according to the project requirements. Relay contact rating should be confirmed before final wiring.
In some industrial fire protection projects, flame detector signals may be used as one input to an extinguishing control panel or fire suppression control logic.
AT-FD02-UVIR3 can provide a fire alarm relay signal and fault relay signal for the connected control system. The final suppression activation logic should be designed by the fire protection engineer according to the protected risk, system standard, control panel logic and project requirements.
For high-risk areas, a single detector signal is usually not the only design consideration. The system may require cross-zone detection, manual release, abort control, time delay, alarm confirmation or other logic depending on the fire suppression system design.
The detector output is important, but the detection performance also affects system design. The AT-FD02-UVIR3 manual lists the following detection distances under specified test conditions:
n-Heptane flame, 0.3 m × 0.3 m: 60 m
Gasoline flame, 0.3 m × 0.3 m: 50 m
Diesel flame, 0.3 m × 0.3 m: 45 m
Kerosene flame, 0.3 m × 0.3 m: 45 m
Alcohol flame, 0.3 m × 0.3 m: 35 m
Paper flame, 0.5 m × 0.2 m: 35 m
Methane flame, 0.7 m high flame: 30 m
Hydrogen flame, 0.7 m high flame: 20 m
Silane flame, 0.7 m high flame: 10 m
The response time is ≤10 seconds for n-Heptane flame and ≤5 seconds for hydrogen flame.
These values help engineers evaluate detector placement, coverage and system response requirements. In real projects, final detector quantity and mounting location should be confirmed according to site layout, flame risk, field of view, obstruction and environmental conditions.
AT-FD02-UVIR3 provides a 120° cone of vision. This wide field of view supports open-area flame monitoring when the detector is correctly installed and aimed toward the protected risk area.
The detector supports wall mounting and ceiling mounting. The aiming angle should be adjusted according to the protection area and field of view.
For system integration projects, correct field coverage is important because the connected panel or monitoring system can only respond after the detector has a clear optical view of the flame source. Pipes, tanks, machines, columns, platforms or structural elements should not block the detector’s view.
AT-FD02-UVIR3 is designed for hazardous industrial environments. The manual lists the explosion-proof marking as:
Ex db IIC T6 Gb
Ex tb IIIC T80°C Db
The detector also provides IP66 / IP67 ingress protection. It uses aluminum alloy ADC12 material and operates from -40°C to +70°C.
These specifications support installation in demanding industrial environments where flame detection equipment may be exposed to dust, moisture, outdoor conditions, low temperature or high ambient temperature.
For oil, gas, chemical, fuel storage and industrial process areas, this environmental protection is important because the detector must work together with the wider fire alarm and safety monitoring system under site conditions.
Correct installation and wiring are essential for reliable system integration.
The manual states that installation and commissioning must be performed by trained personnel and in accordance with applicable standards and site regulations. Before wiring, power should be disconnected. External wiring should be verified for open-circuit or short-circuit conditions before energizing.
Key wiring requirements include:
Use cable with cross-sectional area of at least 1.0 mm².
Strip approximately 6 mm of insulation at the wire end before termination.
Avoid excessive or insufficient exposed conductor length.
Ensure correct tightening torque.
Secure cable glands where applicable.
Adjust the detector aiming angle according to the protection area and field of view.
These requirements help reduce poor connection, unstable output, wiring fault and commissioning problems.
After installation, the detector should be powered up for initialization. The manual states that the green indicator flashes for approximately 50 seconds and then turns solid, indicating normal operation.
Before testing, responsible personnel should be notified. Interlocks or logic outputs for the protected area or system should be disabled where required to avoid unwanted actions.
During commissioning, the following items should be checked:
24 VDC power supply
Correct +24V / GND connection
4–20 mA current loop output
Fire alarm relay output
Fault relay output
Indicator operation
Detector aiming direction
Connected fire alarm panel or monitoring system response
If no indicators are lit, wiring continuity and power supply should be checked, or the unit should be returned for service.
Long-term flame detection performance depends on regular maintenance. The manual recommends periodic inspection and maintenance according to site requirements and relevant standards. At least once per year, the optical window should be cleaned and a functional test should be performed.
Dust can be removed with a clean, soft cloth or compressed air. If oil contamination is present, the optical window should be wiped with alcohol and a lint-free cloth. Hard objects should not be used to avoid scratching the window. After cleaning, a functional test should be performed.
For system integration, maintenance is not only about the detector itself. The connected fire alarm panel, PLC, DCS, SCADA, BMS or monitoring system should also be checked during project maintenance to confirm that alarm and fault signals are received correctly.
AT-FD02-UVIR3 provides a practical signal structure for industrial flame detection projects.
It detects open flame through UV/IR3 optical sensing.
It operates with 24 VDC field power.
It provides 4–20 mA output for status monitoring.
It provides fire alarm relay output for alarm signal transmission.
It provides fault relay output for device supervision.
It supports integration with compatible fire alarm panels, PLC, DCS, SCADA, BMS, RTU and industrial monitoring systems.
It supports wall or ceiling mounting.
It provides 120° cone of vision for open-area monitoring.
It is designed with explosion-proof marking and IP66/IP67 protection for demanding industrial environments.
This makes AT-FD02-UVIR3 suitable for engineers and system integrators who need a flame detector with both optical flame detection and practical output interfaces for industrial safety systems.
