Honeywell LG1093AC05 Flame Sensor

The Honeywell LG1093AC05, also cataloged as the LG1093 Flame Sensor, operates as a dedicated hardware component for UV radiation detection within industrial gas turbine flame monitoring systems.

Hardware Specifications

Process Control and DCS Connectivity

• 4-20 mA HART Loop Protocol: This module functions as an ultraviolet detection sensor; while it communicates with EG1033 amplifier modules via hardwired connections, it is not a transmitter device and does not support HART protocol. System integration is achieved through high-speed discrete signal conditioning via the amplifier unit.
• Channel-to-Channel Isolation: The sensor utilizes a Geiger Mueller-type phototube which provides inherent electrical isolation from the combustion environment. This ensures that high-voltage ignition transients or localized electromagnetic interference in the turbine casing do not propagate to the amplifier's input stage.
• CJC and Sensing: The sensor maintains high sensitivity to UV emissions while remaining solar blind and tolerant to infrared black body radiation. It supports cable distances of up to 330 m when paired with compatible amplifier modules.

Frequently Asked Questions (FAQ)

Q: Is the LG1093AC05 compatible with DLE (Dry Low-NOx) turbine configurations?

A: No. The standard LG1093 series may not perform as expected on GE/NP DLE gas turbines. These specific applications require pre-selected sensors not supported by this model.

Q: Does the sensor require a dedicated power supply?

A: No. As a passive Geiger Mueller phototube, the sensor does not require a local supply voltage; the required excitation is provided by the connected EG1033 amplifier module.

Field Installation Guidelines

• Mechanical Mounting: Ensure the sensor is mounted to the turbine viewing port using the flange interface. Verify the viewing window pressure rating (6.3 psi) is sufficient for the application environment.
• Wiring: Use the provided 2-conductor armored cable to connect the sensor to the amplifier module. Ensure the cable is secured and protected from mechanical abrasion and excessive heat near the turbine casing.
• Grounding: Maintain a continuous ground path for the armored cable shield back to the control cabinet earth to prevent electrical noise coupling into the sensitive UV detection circuit.
• Hazardous Area Compliance: When installing in areas with CE/ATEX ratings (EEx d IIA T3), use only approved explosion-proof conduits and fittings. Do not modify the sensor housing or cable entry, as this voids the hazardous atmosphere certification.
• Validation: Verify correct signal polarity at the amplifier input. Confirm flame monitoring logic is functioning by observing the flame-on/flame-off response times (0.1 s to 0.2 s) during cold-start testing.