Honeywell LG1093AA25 Ultraviolet Flame Sensors

The Honeywell LG1093AA25, also cataloged as the LG1093AA25 Ultraviolet Flame Sensor, operates as a dedicated hardware component for ultraviolet radiation detection and combustion flame verification within industrial burner management architectures. It captures specific wavelength emissions from hydrocarbon reactions and converts them into discrete electrical switching outputs without utilizing internal signal amplification.

Suffix Breakdown & Model Matrix

The model identifier LG1093AA25 indicates the specific optical sensitivity profile, housing configuration, and electrical connection parameters established by the manufacturer. Suffix elements designate standard industrial thread fittings and integrated phototube response ratings tailored for continuous burner surveillance.

Hardware Specifications

4-20 mA HART Loop Protocol and Channel Isolation

The device coordinates loop signaling parameters to interface smoothly with burner management and distributed control systems. Channel-to-channel isolation safeguards sensitive internal detection circuits from high-voltage transient surges originating across shared power busses and ignition transformer loops. Field wiring terminates through shielded conduits to preserve low-level signal integrity against electromagnetic interference.

Frequently Asked Questions

Q: What is the response time of the Geiger-Mueller phototube upon flame extinction?

A: The sensor detects flame loss within standard millisecond thresholds, initiating burner trip signals to the safety controller instantly.

Q: Can the sensor withstand continuous exposure to high-temperature combustion environments?

A: Yes, internal thermal barriers and the specified operating range up to 121 deg C permit direct mounting near burner observation ports when using appropriate cooling sight tubes.

Field Installation Guidelines

Mount the sensor securely onto the designated sighting pipe using threaded mechanical connections, ensuring proper alignment with the primary combustion zone. Route signal cables through dedicated metallic conduits separated from high-voltage ignition wiring to prevent noise coupling. Ground the cable shield drain wire strictly at the control cabinet terminal bar to maintain EMC protection.