Honeywell LG1093AA36 LG1093 Ultraviolet Flame Sensor

Description

Designed for critical gas turbine flame monitoring, the Honeywell LG1093AA36 is a high-sensitivity ultraviolet (UV) flame sensor engineered to detect radiation emitted by hydrocarbon flames. This sensor features a Geiger Mueller-type phototube that is tuned to the 180 to 260 nm spectral band, ensuring it remains solar-blind and highly tolerant to black body radiation. Built for heavy-duty power generation and mechanical compressor systems, this unit integrates seamlessly with EG1033 amplifier modules to deliver rapid flame status detection in rugged environments.

Features

• High UV Sensitivity: Detects radiation in the 180 to 260 nm range while ignoring background solar and black body radiation.
• Rapid Response: Features a typical Flame Present Response Time of 0.1 seconds and a maximum Flame Loss Response Time of 0.2 seconds.
• Extended Transmission Range: Supports operational distances of up to 330 meters (1000 feet) from the sensor to the amplifier module.
• Robust Physical Housing: Equipped with a viewing window rated for up to 10 bar (150 psi) and 3/4-inch internal NPT mounting.
• Teflon Shielded Cable: Includes an integrated cable with a 1-inch external conduit thread for high-temperature and chemical resistance.
• Certified Safety: Approved for hazardous environments with ATEX (EEx d IIA T3) and Factory Mutual (Class I, Division 1 & 2, Groups B, C, D) classifications.

Applications

• General Electric (and GE licensee) industrial gas turbines.
• Power generation turbine flame monitoring.
• Large-scale industrial compressor systems.
• Hazardous-area hydrocarbon combustion processes.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility: The LG1093AA36 serves as a direct cross-reference and functional equivalent to the General Electric part number 261A1812P14. Note that while this sensor is standard on many GE-licensee turbines, it may not function reliably on newer GE/NP Dry Low NOx (DLE) combustor systems. Low-NOx systems typically require pre-selected, high-sensitivity units that are calibrated specifically for low-emission flame properties.

Application Pitfalls & Engineering Notes: Because the sensor relies on detecting UV radiation in the narrow 180 to 260 nm band, any physical obstruction on the viewing window will degrade performance. Hydrocarbon soot, moisture condensation, or oil mist accumulation on the window can block UV light and trigger false flame-out alarms. Routine physical inspection of the window seal and cleaning of the optical path is recommended during planned maintenance outages.

Commissioning & Wiring Tips: Ensure that the integrated Teflon-shielded cable is routed through dedicated, grounded metal conduit to isolate the weak phototube signal from high-voltage motor starters, ignition transformers, and generator cabling. When terminating the cable at the EG1033 amplifier module, verify that shield continuity is maintained and grounded at one end only to prevent ground loops.

Installation Guidelines