Product Overview
The Siemens QRA2 is a compact ultraviolet (UV) flame detector designed for the supervision of gas and oil flames, as well as for ignition spark proving. Engineered for use with Siemens burner controls (such as the LFL, LMG, LGB, and LFE series), it provides high-precision flame monitoring for intermittent industrial heating processes. By detecting the specific UV radiation emitted by a flame, the QRA2 ensures that the burner control system can accurately verify flame presence, preventing hazardous conditions during startup and operation.
Key Features
- Spectral Sensitivity: Specifically tuned to the 190–270 nm range, ensuring the sensor detects the UV light of the flame while remaining blind to the infrared radiation emitted by hot furnace walls.
- Intermittent Operation: Optimized for burner systems requiring at least one controlled shutdown every 24 hours to perform regular safety self-checks.
- Durable Housing: Features a plastic-clad metalized housing that prevents the buildup of static electricity and protects the sensitive UV cell from industrial environments.
- Multiple Sensitivity Levels: Available in standard sensitivity and high-sensitivity versions (e.g., QRA2M) to suit various burner capacities and flame characteristics.
- Versatile Mounting: Can be supplied with or without a mounting flange or clamp, allowing for flexible installation on different burner sight tubes.
- Simple Integration: Features a standardized two-wire connection for straightforward integration into existing Siemens burner control bases.
Core Advantages
- Maximum Operational Safety: Its ability to distinguish between actual flame UV and background refractory glow eliminates the risk of “false flame” signals, significantly improving system safety.
- Unmatched Reliability: As a global industry standard, the QRA2 is trusted for its consistent performance and long service life in demanding thermal processing applications.
- Reduced Maintenance Downtime: The compact, plug-in design allows for rapid inspection, cleaning, or replacement, ensuring minimal disruption to your production line.
- Global Certification: Fully compliant with international safety standards, providing the necessary assurance for equipment manufacturers and end-users in global markets.
