Fireye SC2L-95UVS2-1CEX Explosion-proof ultraviolet flame detector

Description

1. Overview

Fireye SC2L-95UVS2-1CEX is an explosion-proof microprocessor-integrated ultraviolet flame scanner belonging to the Fireye InSight 95 series. Designed for combustion equipment in high-hazard explosion-proof environments such as petrochemical, thermal power, cogeneration and metallurgical industries, it strictly complies with international explosion protection and combustion safety monitoring standards.

Equipped with high-precision ultraviolet (UV) sensing technology and a built-in electronic self-check circuit, it requires no mechanical shutter structure. It delivers real-time and accurate monitoring of flame status for gaseous fuels and light oil fuels, serving as core detection hardware for combustion safety interlock protection systems of industrial burners, boilers, hot blast stoves and process heaters.

This model is a dedicated explosion-proof certified version integrating detection, calculation and output functions. It features adjustable flame thresholds, frequency discrimination and gain adjustment, which effectively shield interference from furnace residual light, high-temperature radiation and ambient stray light, eliminating false alarms of flame-out and missed detection of existing flames.

The device provides 4–20 mA analog flame intensity output and relay contact output, and can seamlessly connect with various combustion controllers, DCS distributed control systems and safety interlock loops. It is applicable to scenarios including new explosion-proof combustion system integration, upgrade and replacement of legacy flame detection equipment, and combustion safety renovation in high-risk working conditions. It boasts core advantages of high reliability, strong anti-interference capability and maintenance-free long-term operation.

2. Technical Features

2.1 High-Precision UV Detection with Wide Fuel Compatibility

Adopting dedicated UV sensors, it accurately captures the exclusive ultraviolet spectral band (295~320 nm) generated by fuel combustion, specifically suitable for flame detection of clean fuels such as natural gas, LPG and light diesel oil.

Targeting the characteristics of unstable gaseous flames with high flicker frequency, 21 adjustable flame flicker frequency levels are built in. Discrimination parameters can be precisely matched according to on-site combustion conditions to effectively distinguish real flames from furnace reflections, glowing hot walls and ambient stray light, greatly improving flame judgment accuracy and fitting routine monitoring of various industrial gas combustion equipment.

2.2 Full Electronic Self-Check with Low Failure Rate and No Mechanical Structure

Abandoning the traditional mechanical shutter self-check structure, it is equipped with a full electronic continuous self-diagnosis system that monitors the operating status of sensors, detection loops, computing chips and output circuits in real time throughout operation, realizing 24/7 uninterrupted fault self-inspection.

With no moving mechanical parts, it completely eliminates mechanical jamming, wear and failure faults, significantly improving structural stability. It supports long-term continuous operation without frequent maintenance and calibration, adapting to unattended industrial combustion system conditions.

2.3 Explosion-Proof Compliant Design for High-Hazard Working Environments

Endorsed by CEX explosion-proof certification, the whole unit meets industrial explosion protection grade specifications and is suitable for high-risk operation environments with flammable and explosive gases and dust accumulation. It can be directly installed in hazardous areas such as petrochemical plants, oil & gas stations and explosion-proof boiler rooms.

The housing adopts a high-strength sealed explosion-proof structure with dustproof, explosion-proof and anti-corrosion properties, resisting erosion of on-site flammable and explosive media and impact from sudden working condition changes. It fully satisfies compliance and safety requirements for combustion safety monitoring in high-hazard locations.

2.4 Flexible Adjustable Parameters with High Working Condition Adaptability

Equipped with a front digital display and four-button operation panel, it supports on-site intuitive viewing of flame intensity, equipment status, fault codes and operating parameters.

Sensor gain, flame on/off thresholds, detection delay and frequency discrimination levels can be customized locally. Four sets of programmable working condition parameter storage are supported to meet combustion monitoring demands of different fuel ratios and load conditions.

The AutoTune automatic adaptation function enables one-click matching of on-site combustion conditions, simplifying commissioning procedures and reducing manual adjustment difficulty.

2.5 Multiple Signal Outputs with Comprehensive System Compatibility

Multiple standardized signal outputs are integrated: dedicated flame relay output, fault alarm relay output and 4–20 mA analog flame intensity output, simultaneously realizing flame on/off interlock, fault alarm and real-time remote transmission of flame intensity.

Natively compatible with the full range of Fireye combustion controllers, mainstream boiler control systems and DCS systems, it features simple wiring and universal protocols. No additional adapter modules are required, and it can be quickly integrated into various combustion safety interlock systems.

2.6 Industrial Rugged Structure for Long-Term Operation in Harsh Conditions

The whole unit adopts a NEMA 4X protection grade sealed structure with dustproof, moisture-proof, waterproof, vibration-resistant and high-temperature aging-resistant properties. It operates over a wide temperature range and withstands harsh on-site conditions including temperature fluctuation, dust accumulation and minor vibration.

The hardware circuit is optimized for anti-interference performance to resist electromagnetic interference and power grid fluctuation at combustion sites. Parameters remain stable without drift during long-term operation, and detection accuracy is consistently maintained for 24/7 uninterrupted continuous monitoring.

3. Specification Parameters

3.1 Basic Model Parameters

Model No.: SC2L-95UVS2-1CEX
Brand & Series: Fireye InSight 95 Series Integrated Flame Scanner
Device Type: Explosion-Proof Ultraviolet (UV) Flame Scanner
Core Technology: Ultraviolet spectrum detection + full electronic continuous self-check + microprocessor intelligent discrimination
Compatible Fuels: Natural gas, LPG, light fuel oil and other UV-spectrum fuels
Core Functions: Real-time flame monitoring, flame intensity acquisition, flame presence/absence logic judgment, fault self-diagnosis, interlock signal output, analog remote transmission
Applicable Equipment: Industrial boilers, gas burners, hot blast stoves, process heaters, petrochemical explosion-proof combustion devices

3.2 Detection Performance Parameters

Detection Spectrum: UV band 295 nm ~ 320 nm with exclusive flame spectrum discrimination
Self-Check Method: Full electronic continuous self-check without mechanical shutter; all-weather fault monitoring
Frequency Discrimination: 21 built-in adjustable flame flicker frequency levels to accurately filter stray light interference
Parameter Adjustment: Customizable sensor gain, flame ON/OFF thresholds and detection delay
Condition Memory: Supports 4 sets of programmable working condition parameters for multi-scenario switching
Detection Accuracy: High-sensitivity sensing acquisition; accurate identification of low-intensity flames with no missed detection or false alarm

3.3 Electrical Parameters

Supply Voltage: Standard industrial 24 VDC DC power supply
Analog Output: 4–20 mA linear output corresponding to flame intensity, compatible with DCS acquisition
Contact Output: Flame relay output and fault alarm relay output; passive contacts for interlock logic
Operation & Display: 8-digit alphanumeric LED display + four-button local operation panel
Commissioning Functions: Supports AutoTune automatic condition adaptation, manual parameter calibration and fault code query
Communication Expansion: Optional Fireye Explorer host software communication for remote monitoring and parameter configuration

3.4 Environmental Parameters

Operating Temperature: -40 ℃ ~ +70 ℃ for stable operation over ultra-wide temperature range
Storage Temperature: -55 ℃ ~ +125 ℃
Operating Humidity: 5% ~ 95% RH (non-condensing), suitable for humid and high-temperature industrial environments
Protection Rating: NEMA 4X fully sealed dustproof, waterproof and explosion-proof structure
EMC Compliance: Meets industrial EMC anti-interference standards to withstand electromagnetic disturbance at combustion sites
Operation Mode: 24-hour non-stop continuous monitoring, suitable for long-term unattended operation

3.5 Mechanical & Maintenance Parameters

Mounting Method: Standard on-site wall mounting / furnace bracket installation, adaptable to industrial combustion equipment layout
Structural Features: Integrated monolithic design with no moving mechanical parts, vibration & impact resistance and extremely low failure rate
Status Indication: Real-time display of operating status, flame intensity and fault information on screen for intuitive maintenance
Maintenance Features: Free of daily calibration and periodic maintenance; fault self-diagnosis enables rapid problem localization
Replacement Compatibility: Direct replacement of legacy same-series UV flame detectors without modifying system interlock logic

4. Working Principle

After power-on, the Fireye SC2L-95UVS2-1CEX flame scanner first completes full hardware self-test and verification of sensing and output loops. It enters normal flame monitoring mode once self-check passes without abnormality.

Relying on the built-in high-precision UV sensor, the device continuously collects exclusive ultraviolet spectral signals in the 295~320 nm band from the combustion zone and captures dynamic flame flicker signals generated by fuel combustion.

Collected raw signals are sent to the internal microprocessor for intelligent calculation and filtering based on preset frequency discrimination, gain thresholds and working condition parameters. Invalid interference signals such as furnace high-temperature radiation, wall reflections and ambient stray light are automatically filtered out, and the on-site flame "present/absent" status is accurately determined with real-time analysis of flame combustion intensity.

Processed flame data is output through multiple channels:

Relay contact signals are connected to the combustion safety interlock system to realize flame-out protection, fuel shutoff and alarm interlock functions;
4–20 mA analog signals linearly transmit flame intensity to the DCS system for remote real-time monitoring.

Meanwhile, the device performs electronic self-check throughout operation. Once sensor abnormality, loop fault, signal loss or other issues are detected, the fault relay alarm is triggered immediately, the operating state is locked and fault codes are recorded to prevent system false interlock or failure, comprehensively ensuring operational safety of the combustion system.

5. Application Scenarios

5.1 Combustion Monitoring for Gas Boilers in Explosion-Proof Plants

Widely applied to gas boilers and gas-fired heaters in high-hazard explosion-proof plants such as petrochemical, oil & gas and coal chemical industries. With CEX explosion-proof qualification, it meets installation requirements in hazardous areas, accurately monitors gas combustion status and realizes emergency interlock protection upon flame-out, eliminating safety hazards of gas leakage and deflagration. It ensures compliant and safe operation of combustion equipment in explosion-proof working conditions.

5.2 Auxiliary Combustion System Monitoring for Thermal Power / Cogeneration Units

Used for flame monitoring of gas ignition systems and auxiliary oil burners in power plants. It stably captures ignition flame and steady-state combustion flame signals, avoids unit safety hazards caused by ignition failure and mid-way flame-out. It adapts to full-condition monitoring including unit startup/shutdown, low load and stable combustion, providing reliable signal support for boiler combustion safety interlock.

5.3 Upgrade and Renovation of Legacy Flame Detection Systems

It can directly replace old mechanical self-check and low-precision UV flame detection equipment without modifying on-site mounting brackets, wiring loops and interlock logic. Electronic self-check technology thoroughly solves problems of frequent mechanical faults, high false alarm rate and heavy maintenance workload of legacy devices, rapidly improving monitoring accuracy and operational stability of combustion systems.

5.4 Safety Interlock Protection for Industrial Process Furnaces

Applicable to continuously operating combustion equipment such as various process heaters, hot blast stoves and cracking furnaces in metallurgical and chemical industries. It monitors flame status 24/7 and feeds back combustion intensity in real time. In case of abnormal flame-out, it quickly triggers interlock shutdown and fuel cutoff to ensure stable operation of continuous production lines and avoid unplanned shutdowns and safety accidents.