Honeywell LG1093AC01 Ultraviolet Flame Sensor

The Honeywell LG1093AC01 is a high speed Ultraviolet (UV) Flame Sensor specifically designed for crucial flame monitoring in industrial boilers, marine power plant steam generators and GE gas turbine systems. The sensor operates on the principle of the Geiger-Mueller tube and continuously searches for the narrow band UV radiation (180 nm to 260 nm) that is released during hydrocarbon burning. This spectral band is located totally in the “solar blind” region, therefore the LG1093AC01 is not affected by visible light interference, solar radiation and red-hot refractory background illumination that would generate misleading flame signals.

The LG1093AC01’s most impressive characteristic, from a maritime and power systems engineering point of view, is its response time. The unit provides a flame signal detection time of 0.1 second and a flame-loss response time of less than 0.2 seconds, giving Burner Management Systems (BMS) the fast input they need to operate fuel safety shutoff valves (SSOVs) before unburned fuel may collect in the combustion chamber. The sensor has a built-in 9-foot (2.7 m) armored wire and a sealed window for a pressure difference of 428 mbar (6 psi).

Model Details:

• Manufacturer / Brand: Honeywell Combustion Controls
• Model Number: LG1093AC01
• Manufacturer Part Number (MPN): LG1093AC01
• System Family: Honeywell LG1093 / EG1033 Flame Monitoring System

Compatible Amplifier Modules

• Honeywell EG1033 Series: EG1033AA (Transistor Open Collector output), EG1033AB (Relay SPDT output), EG1033AC (Relay SPDT output)
• Honeywell Flame Signal Conditioners: Compatible with standard 28 VDC and 115 VAC BMS control architecture tied to EG1033 modules.

Technical Specifications: LG1093AC01 Flame Sensor

Key Features

1. Solar-Blind UV Wavelength Band: Operates exclusively within the 180–260 nm ultraviolet spectrum, ignoring infrared radiation, glowing refractory walls, and sunlight.
2. Ultra-Fast Trip Response: Detects flame presence in 0.1 seconds and triggers flame-loss shutdown in under 0.2 seconds to satisfy strict NFPA and marine class safety timings.
3. Integral Armored Signal Cable: Factory-sealed 9-foot (2.7 m) stainless steel flexible armored lead provides physical protection and EMI/RFI shielding in harsh turbine enclosures.
4. Long Transmission Capability: Drives clear pulsed signals up to 330 meters (1,000 feet) to remotely mounted Honeywell EG1033 series amplifier cards without signal degradation.
5. Hazardous Location Certified: Holds ATEX Zone 1/2 and FM Class I, Division 1/2 approvals for safe deployment in flammable gas and marine offshore atmospheres.

Part Number Cross-References

• Honeywell Part Numbers: LG1093AC01, LG1093AC02, LG1093AC03, LG1093AA01
• GE OEM Part Numbers: 362A1093P001, 362A1093P002

Applications

• GE Gas Turbine Flame Monitoring: Continuous flame presence monitoring on heavy-duty and aeroderivative gas turbines in power plants and oil platforms.
• Marine Power Generation & Propulsion Systems: Main boiler and auxiliary boiler flame scanning on dual-fuel LNG carriers and cargo ships.
• Refinery & Petrochemical Furnaces: Ethylene cracking furnaces, flare stacks, and process fired heaters operating in ATEX Zone 1/2 environments.
• High-Output Industrial Boilers: Multi-burner utility boilers requiring fast-response UV sensors with individual burner discrimination.
• Co-generation & Combined Cycle Plants: Heat Recovery Steam Generators (HRSG) with supplementary duct firing.

Frequently Asked Questions

What is the primary operating principle of the Honeywell LG1093AC01 flame sensor?

The LG1093AC01 uses a Geiger-Mueller phototube sensitive to UV light in the 180 to 260 nm spectrum. When UV photons strike the phototube, it ionizes gas inside the tube to produce electrical pulses proportional to flame intensity, which are sent to an EG1033 amplifier for flame signal processing.

Is the LG1093AC01 affected by sunlight or glowing hot boiler refractories?

No. The sensor is strictly solar-blind and operates in a short UV wavelength band (180–260 nm). Atmosphere absorbs solar radiation in this specific band, and hot furnace bricks emit radiation in the infrared and visible spectra, keeping the sensor free from false alarms.

What amplifier module is required to operate the LG1093AC01?

The LG1093AC01 requires a Honeywell EG1033 series amplifier module (such as EG1033AA, EG1033AB, or EG1033AC). The amplifier provides high-voltage bias excitation to the sensor phototube and converts incoming pulse streams into dry relay contacts or open-collector outputs for the master safety system.

How far can the LG1093AC01 sensor be installed from the control amplifier?

The LG1093AC01 can transmit accurate flame signals across distances up to 330 meters (approximately 1,000 feet) using low-capacitance shielded twisted-pair wiring without needing signal boosters.

How should the quartz lens window be cleaned during routine maintenance?

Clean the fused quartz sight window using a soft, lint-free cloth moistened with isopropyl alcohol. Avoid abrasive cleaners, metal scrapers, or harsh solvents that could scratch or etch the quartz coating, as scratches scatter UV light and lower sensor sensitivity.