Description
1. Overview
Honeywell LG1093AA24 is an industrial-grade UV ultraviolet flame detector manufactured by Honeywell. Designed for combustion equipment including gas turbines, industrial burners, boilers and furnaces, it serves as a core detection component within combustion safety monitoring systems.Adopting exclusive ultraviolet spectrum detection principle, the detector accurately captures ultraviolet light emitted during flame combustion to identify open flame status. It feeds real-time feedback on flame presence, combustion anomalies and flameout faults, providing reliable detection signals for ignition interlock, flameout protection, fault alarming and emergency shutdown of combustion systems. It is critical hardware ensuring safe, stable and compliant operation of thermal equipment.
This product adopts a solid-state UV sensing core with no moving mechanical parts. It features immunity to visible light interference, precise detection, fast response and minimal temperature drift with outstanding operational stability. It effectively prevents false judgements and false alarms triggered by natural daylight, ambient lighting and high-temperature infrared radiation, adapting to harsh operating conditions inside industrial furnaces featuring high temperature, dust, oil fume, vibration and wide temperature fluctuations.Supporting universal AC/DC power supply, the product boasts explosion-proof pressure-resistant construction and high protection rating. It is compatible with mainstream combustion controllers and unit interlock systems, widely used for new installation matching and upgrade replacement of legacy detectors in power plant gas turbines, industrial boilers, petrochemical heating equipment and metallurgical combustion systems.
2. Technical Features
1. Exclusive UV Detection Principle with Superior Anti-Interference Performance
It adopts pure UV-band flame detection technology and only responds to the unique ultraviolet spectrum of flames. It remains insensitive to natural daylight, sunlight, indoor lighting and high-temperature infrared radiation, eliminating false flame-free alarms and misjudgements fundamentally.Unlike infrared detectors, it is not affected by residual high temperature inside furnaces or thermal radiation from furnace walls. It accurately distinguishes genuine flames from high-temperature heat sources and greatly improves reliability and safety of combustion monitoring systems.
2. High-Speed Response for Unit Safety Interlock
Equipped with high-sensitivity UV sensing chip for rapid signal acquisition and processing, the standard response time is ≤ 2 seconds. It can quickly capture abnormal conditions such as flameout, flame lifting, flashback and combustion interruption.It promptly triggers combustion system flameout protection, fuel cut-off, audible & visual alarm, unit interlock shutdown logic, effectively mitigating major safety risks including gas leakage, furnace deflagration and equipment overheating, satisfying safety operation specifications for industrial combustion equipment.
3. Wide-Temperature Pressure-Resistant Industrial Construction with Excellent Condition Adaptability
The whole unit features industrial reinforced modular construction. The housing is made of 1.4571 stainless steel; the viewing window adopts high-transmittance fused silica with excellent high-temperature resistance, corrosion resistance and stable light transmission performance.The device withstands high pressure and suits furnace operation under high pressure or slight positive pressure. It resists high-frequency vibration, dust, oil contamination and humid corrosive environments with slow performance degradation over long-term continuous operation, meeting year-round non-stop production requirements.
4. Universal AC/DC Power Supply with Broad System Compatibility
It supports wide-range 24 VAC / 24 VDC universal power supply with strong power adaptability. It can directly match mainstream combustion control systems, flame amplifiers and PLC interlock systems deployed in power plants, petrochemical and metallurgical industries.It delivers stable output signals with strong immunity to line interference; no signal attenuation or data drift occurs during long-distance transmission. No extra conversion modules are required, suitable for retrofitting and matching of new and legacy systems.
5. High-Sensitivity Precision Detection with Wide Monitoring Coverage
Standard high detection sensitivity with a minimum detection threshold of 1.5 mW/m². It accurately captures weak flame signals, small flames and residual combustion signals to avoid missed flame detection under low-load conditions.The standard detection distance reaches 20 feet, covering operating zones of conventional industrial furnaces and burners to satisfy full-range monitoring demands of all sizes of combustion equipment.
6. Maintenance-Free Solid-State Design with Extended Service Life
Internal solid-state sensor structure without rotating lenses, mechanical contacts or wearable moving parts, eliminating faults caused by mechanical wear, jamming and aging.Low power consumption and low heat generation deliver high stability. No routine calibration, maintenance or frequent dust cleaning is required, significantly cutting equipment maintenance costs and downtime, ideal for long-term continuous operation of industrial facilities.
3. Technical Specifications
1. Basic Parameters
Model: LG1093AA24Brand: HONEYWELLProduct Type: Industrial Ultraviolet Flame DetectorDetection Principle: UV spectrum flame detectionCore Functions: Real-time flame monitoring, flameout fault detection, combustion status feedback, unit safety interlock protectionApplicable Equipment: Gas turbines, industrial boilers, oil/gas burners, petrochemical furnaces, metallurgical thermal equipmentApplication Scenarios: Power plant gas turbine systems, petrochemical thermal systems, industrial kilns, upgrade & replacement of legacy flame detection systems
2. Detection Performance Parameters
Detection Band: Exclusive flame ultraviolet bandDetection Sensitivity: 1.5 mW/m²Effective Detection Distance: 20 ft (approx. 6 m)Response Time: ≤ 2 sDetection Characteristic: Only responds to flame UV signals; shields visible light and high-temperature infrared interferenceOperation Mode: Continuous real-time monitoring, rapid response to abnormalitiesAccuracy Characteristic: Low false alarm rate, low missed detection rate, excellent stability under varying operating conditions
3. Electrical Parameters
Supply Voltage: 24 VAC / 24 VDC universalPower Consumption: 10 VASignal Characteristic: Standard flame detection switch / analog feedback signal, compatible with mainstream flame amplifiersAnti-Interference Performance: Tolerates industrial electromagnetic interference, power frequency harmonics and line clutterElectrical Stability: Wide voltage tolerance, stable operation under voltage fluctuation
4. Mechanical & Mounting Parameters
Housing Material: 1.4571 stainless steelWindow Material: High-temperature resistant fused silicaMounting Method: Standard 3/4 inch internal thread mountingMaximum Pressure Rating: 21 bar (300 psi)Structural Characteristics: Dust-proof, oil contamination resistant, corrosion resistant, vibration resistantAssembly Feature: Standardized interface for easy installation and tight sealing, matching standard mounting positions on furnace side walls
5. Environmental Parameters
Operating Ambient Temperature: -40℃～+177℃Storage & Transportation Temperature: -40℃～+85℃Operating Humidity: 5%～95% RH, non-condensing, no corrosive gasEnvironmental Resistance: High temperature resistance, dust & oil resistance, humidity-heat aging resistance, mechanical vibration resistanceApplicable Conditions: High-temperature furnace environments, outdoor equipment areas, high-dust industrial workshops, long-term continuous operation scenarios
4. Operating Principle
The Honeywell LG1093AA24 ultraviolet flame detector operates based on selective UV spectrum induction + photoelectric signal conversion + intelligent logic discrimination.
Upon power-up, the fused silica window precisely filters visible light, infrared light and ambient stray light, only allowing exclusive ultraviolet waves generated by flame combustion to enter the sensing core. The built-in high-precision UV sensor converts optical signals into standardized electrical signals in real time. After filtering, shaping and noise reduction via the internal signal processing circuit, stable detection signals are output.
When combustion equipment ignites normally and maintains stable combustion, the detector continuously receives valid UV flame signals and transmits normal combustion status signals to sustain unit operation.In case of flameout, flame lifting or combustion interruption, the UV flame signal disappears or decays abnormally. The detector rapidly identifies flame faults and immediately outputs abnormal signals to trigger audible & visual alarms, fuel valve cut-off and unit interlock shutdown via the downstream control system.It prevents safety incidents caused by fuel injection without ignition or accumulated gas, ensuring fully controllable safety of the combustion system.
5. Application Scenarios
1. Flame Monitoring for Gas Turbines / Power Plant Thermal Units
Widely deployed in core flame detection loops of power plant gas turbines, combined cycle units and waste heat boilers. It monitors combustion chamber flame status 24/7, delivering precise signals for ignition permission, combustion stability judgement and flameout interlock protection. It is essential detection equipment for safe operation and compliant maintenance of power generation units.
2. Supporting Equipment for Petrochemical & Metallurgical Industrial Furnaces
Suitable for petrochemical heating furnaces, metallurgical kilns, industrial oil/gas burners and other thermal equipment. It accurately identifies furnace combustion status and effectively mitigated hazards including deflagration after flameout, gas leakage and incomplete combustion. It satisfies strict safety production control requirements of chemical and metallurgical industries and guarantees stable continuous mass production.
3. Technical Retrofit & Upgrade of Legacy Flame Detection Systems
It can directly replace aging infrared detectors and outdated flame detection equipment suffering from sensitivity degradation, frequent false alarms and slow response. No modification to mounting interfaces, wiring loops or control logic is needed.It resolves persistent defects such as missed detection, false alarms and unstable operation of legacy systems with low investment, rapidly restoring accuracy and safety of combustion monitoring systems.
4. Safety Interlock Supporting for Industrial Combustion Equipment
Applied to safety interlock circuits of various industrial boilers, commercial thermal equipment and automated combustion systems. As the core flame detection component, it improves ignition, stable combustion and flameout protection logic of equipment. It complies with industrial safety production codes, reduces equipment failure and accident risks, and elevates automation and safety control levels of facilities。
