Honeywell LG1093AC01 Flame Detector

Honeywell LG1093AC01 Flame Detector – Precision UV Flame Sensing for Gas Turbines

The Honeywell LG1093AC01 Flame Detector delivers mission-critical ultraviolet flame sensing for GE gas turbine combustion systems. Engineered with solar-blind UV sensor technology and advanced signal processing, this detector provides reliable flame presence verification in the harshest industrial environments. Designed specifically for power generation applications, the LG1093AC01 ensures safe turbine operation through continuous combustion monitoring with exceptional immunity to false signals from ambient light and hot metal surfaces.

Technical Specifications

• Detection Technology: Solar-blind ultraviolet (UV) sensor
• Spectral Response: 185-260 nanometers wavelength range
• Application: GE gas turbine combustion monitoring
• Flame Response Time: Less than 4 seconds typical
• Ambient Temperature Range: -40 °F to +185 °F (-40 °C to +85 °C)
• Viewing Angle: 90-degree cone of vision
• Mounting: Direct combustor can mounting with threaded connection
• Output Signal: Relay contact closure for flame presence indication
• Power Requirements: 120 VAC or 24 VDC (model dependent)
• Enclosure Rating: NEMA 4X weatherproof construction
• Certifications: FM approved, UL listed for hazardous locations
• Service Life: 40,000+ hours typical sensor lifespan

Advanced UV Detection Technology

The LG1093AC01 employs sophisticated solar-blind UV sensing technology that fundamentally differentiates it from conventional flame detection methods:

• Solar-Blind Spectral Range: Responds exclusively to UV radiation in the 185-260nm band emitted by hydrocarbon flames while remaining completely insensitive to solar radiation, eliminating false trips from sunlight exposure
• Black-Body Radiation Immunity: Advanced optical filtering rejects infrared radiation from hot refractory surfaces, turbine components, and exhaust gases that would trigger false flame signals in IR-based detectors
• Flicker Frequency Analysis: Signal processing algorithms verify the characteristic 5-500 Hz flicker frequency of hydrocarbon combustion, distinguishing true flames from steady-state UV sources like welding arcs or lightning
• Self-Checking Circuitry: Continuous internal diagnostics monitor sensor integrity, amplifier function, and optical path cleanliness with automatic fault annunciation
• Flame Discrimination: Differentiates between pilot flames and main combustion zones through adjustable sensitivity settings for multi-stage ignition sequences

Gas Turbine Application Engineering

The LG1093AC01 addresses the unique combustion monitoring challenges inherent in industrial gas turbine power generation systems:

• Multi-Can Combustor Monitoring: Provides individual flame verification for each combustion can in GE Frame 5, Frame 6, and Frame 7 turbines, enabling early detection of single-can flameouts before they cascade into full turbine trips
• Startup Sequence Verification: Confirms successful pilot ignition and main fuel valve opening during turbine startup, preventing unburned fuel accumulation that could cause explosive combustor damage
• Load Transfer Protection: Monitors flame stability during fuel switching operations between natural gas and liquid fuels, detecting combustion instabilities that precede flameout conditions
• Emissions Compliance Support: Enables lean premix combustion strategies for NOx reduction by providing reliable flame presence feedback even at ultra-lean fuel-air ratios approaching blowout limits
• Hot Restart Capability: Maintains accurate flame sensing during hot turbine restarts when combustor metal temperatures exceed 1000 °F, conditions that blind infrared detectors

Installation & Integration Architecture

The LG1093AC01 mounts directly to the combustor can through a threaded boss, positioning the UV sensor with optimal line-of-sight to the flame zone. The detector integrates with turbine control systems via relay contact outputs that feed flame status to the Mark V, Mark VI, or Mark VIe control platforms. Wiring terminates at an explosion-proof junction box rated for Class I Division 2 hazardous locations. The optical viewing window requires periodic inspection and cleaning per OEM maintenance schedules, typically at major turbine overhaul intervals.

Operational Reliability Features

• Purge Air Integration: Accepts continuous purge air flow to prevent combustion gas ingress and maintain optical window cleanliness throughout operating cycles
• Vibration Resistance: Ruggedized construction withstands turbine-induced vibration up to 5G acceleration without signal degradation or mechanical failure
• Thermal Shock Tolerance: Survives rapid temperature transients during emergency shutdowns and hot restarts without sensor damage or calibration drift
• EMI/RFI Immunity: Shielded electronics reject electromagnetic interference from ignition transformers, generators, and high-voltage switchgear
• Fail-Safe Design: De-energize-to-trip relay logic ensures turbine shutdown on detector power loss or internal fault conditions
• Field Replaceable Sensor: Modular UV tube design enables on-site replacement without removing the entire detector assembly from the combustor

Maintenance & Lifecycle Management

Routine maintenance involves quarterly visual inspection of the optical window for carbon deposits or thermal degradation, with cleaning performed using approved solvents and lint-free cloths. Annual functional testing verifies response time and sensitivity using calibrated UV test lamps. The UV sensor tube requires replacement at 40,000-hour intervals or when sensitivity testing indicates degradation below specification. Complete detector replacement is recommended at 80,000 operating hours or 10 years, whichever occurs first, to maintain optimal reliability in critical safety applications.

Safety & Compliance Certifications

Factory Mutual (FM) approved for use in combustible gas atmospheres. Underwriters Laboratories (UL) listed for Class I Division 2 Groups B, C, D hazardous locations. Complies with NFPA 85 Boiler and Combustion Systems Hazards Code requirements for flame safeguard systems. Meets API 556 Fired Heater standards for burner management systems. CE marked for European Union machinery directive compliance. Manufactured under ISO 9001:2015 quality management systems with complete material traceability.

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Why Choose Industrial Control Hub?

We specialize in delivering authentic Honeywell combustion control components with complete factory documentation, application engineering support, and expedited global shipping. Our turbine instrumentation specialists provide comprehensive pre-sale consultation to ensure proper detector selection, mounting configuration, and control system integration for your specific gas turbine platform. Post-sale support includes commissioning assistance, sensitivity calibration guidance, and lifecycle maintenance planning to maximize flame detection reliability and turbine safety system performance.

Product Authenticity: Factory-certified genuine Honeywell components with serialized traceability and anti-counterfeit verification
Technical Consultation: Combustion control engineering support for system design and optimization
Express Logistics: Priority shipping to power generation facilities worldwide with expedited customs clearance
Warranty Coverage: Comprehensive manufacturer-backed warranty with extended protection options
Documentation Package: Complete installation manuals, wiring diagrams, calibration procedures, and compliance certificates

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