Honeywell LG1093AA46 LG1093 Flame Sensor

Description

Monitoring hydrocarbon flames in heavy-duty gas turbine environments is the primary function of the Honeywell LG1093AA46 ultraviolet (UV) flame sensor. This industrial-grade Geiger-Mueller type sensor phototube detects radiation specifically in the 180 to 260 nm spectrum, rendering it completely solar-blind and highly tolerant to black-body radiation. Engineered for compatibility with EG1033 amplifier modules, this sensor serves as a critical safety component on General Electric and GE-licensee gas turbines. The assembly features a robust viewing window rated for high pressure and is equipped with an integrated, Teflon-shielded cable to withstand extreme thermal and mechanical stresses in power generation and compressor applications.

Features

• Highly Selective UV Detection: Uses a Geiger-Mueller phototube sensitive only to the 180 to 260 nm band to prevent false signals from hot turbine metal surfaces.
• Fast Response Times: Typical flame-present recognition within 0.1 seconds and a maximum flame-loss shutdown response of 0.2 seconds.
• Rugged Enclosure: Features a high-pressure viewing window rated up to 10 bar (150 psi) and 3/4-inch internal NPT mounting connections.
• Long-Distance Transmission: Supports cable runs up to 330 meters (1000 feet) from the sensor to the remote EG1033 amplifier module.
• Hazardous Location Approvals: Certified for explosion-proof environments with ATEX/CE and Factory Mutual (FM) ratings.

Applications

• General Electric (and GE licensee) industrial gas turbines.
• Power generation turbine flame monitoring systems.
• Heavy mechanical-drive pipeline compressors.
• Hazardous area combustion processes requiring Class I, Division 1 protection.

Technical Specifications

Alternative Models & Compatibility

The LG1093AA46 is physically and electrically interchangeable with standard GE part number 261A1812P15. It must be paired with Honeywell EG1033 series controller modules to process the phototube output. Note that this standard UV sensor is not compatible with GE/NP DLE (Dry Low-NOx) gas turbines. DLE turbines produce different flame emission signatures and require pre-selected, specialized UV sensors not available under standard Honeywell commercial designations.

Application Pitfalls & Engineering Notes

The internal Geiger-Mueller tube will degrade rapidly if operated continuously above its maximum limit of 176 degC. In high-ambient compartments, proper cooling air or isolation mounts should be implemented to protect the internal optics. Additionally, because oil mist, soot, and heavy moisture absorb UV light in the 180 to 260 nm band, even minor window contamination can severely decrease sensitivity, resulting in false flame-out alarms despite an active combustion profile. Periodic inspection of the 10-bar rated optical window is critical.

Commissioning & Wiring Tips

The sensor's integral Teflon-shielded cable must be routed through dedicated, grounded metal conduit. Avoid running the high-sensitivity signal cable adjacent to high-voltage ignition transformer leads or heavy motor power lines to prevent EMI-induced false flame indications. Ensure the cable shield is tied directly to the designated instrument ground at the EG1033 amplifier side only; do not ground the shield at both ends to prevent ground loops.

Installation Guidelines