Product Overview
The Siemens QRA10 is a rugged ultraviolet (UV) flame detector designed for the supervision of gas and oil flames, as well as for ignition spark proving. While sharing the high-precision sensing technology of the QRA2, the QRA10 features a heavy-duty die-cast aluminum housing, making it the preferred choice for demanding industrial environments. It is designed to work seamlessly with Siemens burner controls (such as the LFL, LMG, LGB, and LFE series) to provide reliable flame detection for intermittent combustion processes.
Key Features
- Rugged Die-Cast Aluminum Housing: Provides superior mechanical protection and durability compared to plastic models, ideal for heavy industrial use.
- Spectral Sensitivity: Optimized for the 190–270 nm UV range, ensuring the detector reacts only to the flame’s radiation and ignores the infrared glow from hot refractory brickwork.
- Integrated Cooling Air Connection: Features a dedicated port for cooling air, allowing the detector to operate reliably even in high-ambient temperature applications.
- Intermittent Operation: Certified for use in burner systems that undergo a controlled shutdown at least once every 24 hours.
- Sensitivity Variations: Available in standard sensitivity and high-sensitivity (e.g., QRA10M.C) versions to accommodate different burner types and fuel characteristics.
- Secure Mounting: Equipped with a robust threaded connection for stable and precise alignment with the burner’s sight tube.
Core Advantages
- Industrial-Grade Durability: The aluminum enclosure protects the sensitive UV cell from physical impact, dust, and heat, ensuring a longer service life in harsh factory conditions.
- Elimination of False Signals: By ignoring the “refractory glow” of hot furnace walls, the QRA10 prevents unsafe “false flame” signals, enhancing the overall safety of the combustion system.
- Ease of Maintenance: The screw-on design allows for quick removal and cleaning of the UV glass lens, ensuring the flame signal remains strong without extended process downtime.
- Versatile Application: Thanks to the cooling air option and rugged build, it is suitable for a wider variety of industrial furnaces and boilers compared to standard indoor flame sensors.
