Honeywell LG1093AA03 Flame Detectors

The Honeywell LG1093AA03, also cataloged as the LG1093AA03 UV Flame Monitor System, operates as a dedicated hardware component for ultraviolet radiation detection and flame state signaling within gas turbine platforms. The hardware utilizes an integrated Geiger-Mueller-type sensor phototube to track radiation vectors emitted by hydrocarbon combustion zones, transforming raw optical inputs into stable discrete presence or absence metrics for the host controller.

Hardware Specifications

Process Control and DCS Metrics

• High-Velocity Pulse Scaling and Spectral Filtering: The monitor architecture isolates the narrow ultraviolet spectrum unique to hydrocarbon ignition, blind to ambient infrared emissions or visible light reflections. The internal sensing cell processes incoming UV photon streams to trigger localized current discharges, scaling individual ionizing events into uniform data profiles prior to the amplification and digitization phases.
• Channel-to-Channel Isolation and Noise Attenuation: To secure long-distance signaling tracks extending up to 1000 feet against high-frequency electromagnetic fields, the electronics maintain strict galvanic and physical safety barriers. This design enforces robust channel-to-channel isolation parameters between the high-potential sensor excitation loop and the low-voltage backplane data buses, blocking common-mode line noise generated by surrounding turbine machinery.

Frequently Asked Questions

Q: How does the Geiger-Mueller-type phototube prevent false flame indications caused by solar radiation?

A: The sensor window and gas mixture are physically tuned to respond strictly to short-wave ultraviolet radiation below 280 nanometers. Because the earth's atmospheric ozone layer absorbs solar UV radiation within this specific band, the monitor remains completely blind to natural sunlight, preventing false flame presence trips during outdoor installations.

Q: Can the LG1093AA03 sensor head be mounted directly to high-pressure combustion liners?

A: Yes. The structural viewing window features a mechanical seal rated for up to 150 psig at a constant thermal boundary of 400 deg F. This window containment allows direct sight-line integration into heavy gas turbine combustor casings without risking process gas blowback or leakage.

Field Installation Guidelines

• Chassis Layout Alignment, Clearance Constraints, and Mechanical Seating: Bolt the sensor housing square to the turbine flanged sight-pipe, checking that the mechanical locknuts align perfectly to prevent optical axis drift. Maintain clear positioning within the specified -40 to +350 deg F envelope, and route cables away from hot surface conduction zones to sustain natural convective cooling across the module exterior.
• Conductor Separation, Wireway Constraints, and Shield Grounding: Route the sensor-to-amplifier low-voltage cables through dedicated low-voltage wireways kept clear of 480 VAC generation buses or high-frequency igniter lead tracks. Connect all external cable shield braids to a single, central copper bus bar inside the main panel cabinet to isolate the -40 to +350 deg F monitoring span from stray electromagnetic currents.