LG1093AA24 Ultraviolet Flame Scanner (Industrial-Grade Combustion Monitor)

The LG1093AA24 represents Honeywell's proven ultraviolet flame detection technology engineered for mission-critical industrial combustion systems. Utilizing precision-tuned UV spectral analysis within the 190-290 nanometer bandwidth, this flame scanner delivers sub-4-second flame verification response times essential for preventing hazardous fuel accumulation in boilers, process heaters, and thermal oxidizers.

Designed for harsh industrial environments where combustion reliability directly impacts operational uptime and personnel safety, the LG1093AA24 combines rugged NEMA 4X / IP66 environmental protection with FM/UL/CSA safety certifications. Its 90-degree conical field of view ensures comprehensive flame coverage across diverse burner geometries, while the 24VAC/DC electrical compatibility simplifies integration with existing burner management infrastructure.

Whether you're upgrading legacy flame safeguard systems or designing new combustion control architectures, the LG1093AA24 provides the detection accuracy and environmental resilience demanded by power generation facilities, petrochemical refineries, and heavy industrial heating applications. Backed by Honeywell's combustion safety heritage and supported by comprehensive technical documentation, this UV flame scanner serves as the cornerstone of reliable burner management systems worldwide.

Core Capabilities & Technical Advantages

→ Ultraviolet Spectral Precision: Narrow-band 190-290nm UV sensitivity eliminates false triggering from visible light, hot refractory, or infrared radiation sources. This spectral selectivity ensures accurate flame-only detection even in high-temperature furnace environments with intense background radiation.

→ Rapid Flame Response Verification: ≤4-second typical response time enables fast burner shutdown sequences during flame-out conditions, minimizing unburned fuel accumulation and explosion risks. Critical for compliance with NFPA 85 and IEC 61508 safety standards.

→ Wide-Angle Flame Coverage: 90-degree cone of vision monitors entire burner flame envelope from a single mounting point. Reduces the number of scanners required for multi-nozzle burners, lowering installation costs and simplifying wiring.

✓ Extreme Environment Durability: NEMA 4X / IP66 enclosure rating withstands -40°F to +185°F operating temperatures, corrosive atmospheres, and high-pressure washdown conditions. Ideal for offshore platforms, chemical plants, and outdoor installations.

✓ Universal Electrical Compatibility: 24VAC/DC dual-voltage operation integrates seamlessly with Honeywell RM7800/RM7890 series, Siemens LMV/LME controllers, and third-party burner management systems without voltage conversion requirements.

✓ Standard NPT Mounting Interface: 1-1/4" NPT threaded connection fits industry-standard flame scanner ports, enabling direct replacement of aging scanners without furnace modifications or custom adapters.

Industrial Application Solutions

Power Generation Boiler Monitoring
Coal, oil, and natural gas-fired utility boilers demand continuous flame verification to prevent furnace explosions and maintain steam production schedules. The LG1093AA24's fast response time and UV-only sensitivity provide reliable main flame and pilot flame detection across load swings from 20% to 100% MCR. Typical installations include tangentially-fired boilers, wall-fired units, and stoker-fed systems where ash particulates and flame pulsation challenge conventional detectors.

Petrochemical Process Heater Safety
Refinery crude heaters, reformer furnaces, and cracking unit heaters operate at extreme temperatures where refractory glow can fool IR-based detectors. The LG1093AA24's UV-specific spectral response ignores hot surfaces while maintaining positive flame signal from hydrogen-rich process gas flames. Meets API RP 556 recommendations for fired heater flame safeguard systems.

Industrial Thermal Oxidizer Control
VOC abatement systems and hazardous waste incinerators require verified combustion to ensure destruction efficiency and emissions compliance. The LG1093AA24 monitors oxidizer burner flames through quartz sight ports, providing interlock signals to prevent untreated emissions release during flame-out events. Compatible with regenerative thermal oxidizers (RTOs) and catalytic oxidizers.

Marine Propulsion & Auxiliary Boilers
Shipboard boiler rooms demand compact, vibration-resistant flame detection that performs reliably during vessel motion and salt-air exposure. The LG1093AA24's NEMA 4X corrosion protection and shock-resistant construction meet maritime classification society requirements for main propulsion boilers and auxiliary steam generators.

Food Processing & Drying Systems
Direct-fired dryers, ovens, and roasters in food manufacturing facilities benefit from the LG1093AA24's sanitary design and fast flame loss response. Prevents product contamination from unburned fuel and supports HACCP safety protocols in bakeries, snack food plants, and grain processing operations.

Technical Parameters & Selection Criteria

Selection Guidelines: Choose the LG1093AA24 when your application requires UV-only flame detection with 24VAC/DC power compatibility. For 120VAC systems, consider alternative LG1093 series models. Verify that your sight port uses quartz or UV-transmitting glass—standard borosilicate glass blocks UV radiation and will prevent proper operation. In applications with high ambient vibration (>0.5g), specify additional mounting support brackets to prevent UV tube filament damage.

Advanced Integration & IoT Connectivity

While the LG1093AA24 provides traditional relay output for direct burner management system integration, modern combustion control architectures increasingly demand digital connectivity for predictive maintenance and remote diagnostics. Pair the LG1093AA24 with Honeywell's ControlEdge PLC or Experion PKS DCS platforms to enable:

• Flame Signal Strength Monitoring: Track UV sensor tube degradation trends to schedule preventive replacement before failure occurs
• Remote Flame Status Visualization: Monitor multi-burner flame conditions from centralized control rooms via OPC UA or Modbus TCP protocols
• Alarm Analytics: Correlate flame-out events with fuel pressure, air flow, and ignition system parameters to diagnose root causes
• Compliance Documentation: Automatically log flame scanner self-test results and response time verification for regulatory audits

For brownfield installations with legacy relay-based systems, the LG1093AA24's simple contact closure output ensures backward compatibility while preserving upgrade paths to smart combustion management as budgets allow.

Delivery Timelines & Service Commitments

Standard Lead Time: 3-5 business days for in-stock LG1093AA24 units shipping from our regional distribution centers. Expedited same-day shipping available for critical outage situations (additional fees apply).

Factory Calibration: Every flame scanner ships with Honeywell factory calibration certificates documenting spectral response verification and flame sensitivity testing. No field calibration required—install and commission immediately.

Warranty Coverage: 12-month comprehensive warranty covering manufacturing defects, UV sensor tube failures, and relay contact malfunctions. Extended 36-month warranty programs available for high-reliability applications.

Technical Support Access: Unlimited phone and email support from our combustion safety specialists. Assistance includes wiring diagrams, troubleshooting guidance, flame scanner positioning recommendations, and burner management system integration consulting.

Documentation Package: Complete installation manual, dimensional drawings, electrical schematics, and FM/UL certification documents included with every shipment. CAD models and 3D STEP files available for download to support engineering design reviews.

Frequently Asked Questions

How does the LG1093AA24 differentiate between actual flames and hot refractory surfaces?
The UV spectral range (190-290nm) is only emitted by active combustion reactions, not by incandescent surfaces. Hot refractory, glowing carbon deposits, and furnace walls emit primarily infrared and visible light, which the LG1093AA24's UV-specific sensor ignores completely. This spectral selectivity prevents false flame signals in high-temperature environments.

Can I replace an older Honeywell C7027 or C7035 flame detector with the LG1093AA24?
Yes, the LG1093AA24 is designed as a direct upgrade path from legacy Honeywell UV scanners. The 1-1/4" NPT mounting thread matches older models, though you should verify electrical compatibility (the LG1093AA24 uses 24VAC/DC while some C-series detectors used 120VAC). Consult wiring diagrams to confirm relay contact ratings match your burner control requirements.

What maintenance procedures are required to ensure reliable long-term operation?
Quarterly inspection of the quartz sight tube for soot accumulation, condensation, or cracks is recommended. Clean with isopropyl alcohol and lint-free cloth if contamination is present. Annual functional testing should include flame simulation tests and response time verification per NFPA 85 guidelines. UV sensor tubes typically provide 40,000+ operating hours before replacement is needed.

Is the LG1093AA24 suitable for monitoring pilot flames in addition to main burner flames?
Yes, the high sensitivity and fast response time make the LG1093AA24 effective for both pilot and main flame monitoring. For pilot-only applications, ensure the scanner is positioned within 6-18 inches of the pilot burner to maintain adequate UV signal strength. Some installations use dual scanners—one for pilot verification and a second for main flame confirmation.

Does the flame scanner require periodic recalibration or sensitivity adjustments?
No field calibration is required. The LG1093AA24 ships with factory-set sensitivity optimized for typical industrial fuel flames (natural gas, propane, fuel oil, coal). The UV sensor tube's spectral response remains stable throughout its service life. If flame detection becomes unreliable, the issue is typically sight tube contamination or UV tube end-of-life rather than calibration drift.

Can the LG1093AA24 detect flames through standard furnace observation ports or peepholes?
Only if the observation port uses quartz or UV-transmitting glass. Standard borosilicate glass, tempered glass, and most plastics block UV radiation below 300nm. If your existing sight port uses non-UV glass, you'll need to replace it with a quartz window or install a dedicated flame scanner port with quartz tube.

Secure Your Combustion Safety Investment

Industrial Control Hub delivers factory-certified Honeywell flame detection equipment with complete technical support infrastructure. Every LG1093AA24 scanner undergoes receiving inspection, functional verification, and documentation review before shipment to ensure you receive genuine OEM products ready for immediate installation.

Request a quote today to discuss your specific burner management requirements, flame scanner positioning recommendations, and integration with your existing control systems. Our combustion safety specialists are available to provide application engineering support, wiring assistance, and startup commissioning guidance.

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