Overview
The Siemens QRA73.A17 is a high-precision ultraviolet (UV) flame detector designed for the continuous supervision of gas or oil flames and for ignition spark proving. As a critical safety component within burner management systems, it features an integrated self-checking mechanism that ensures reliable flame detection by periodically verifying the sensor’s functionality. This detector is specifically engineered for use with Siemens LMV5 and LME7 burner controls, providing a robust solution for industrial and commercial combustion applications where safety and operational efficiency are paramount.
Features
- Integrated self-checking mechanism allows for continuous flame supervision without interruption
- Normal sensitivity UV photodiode optimized for detecting gas flames and blue or yellow burning oil flames
- Designed for seamless integration with Siemens LMV5 and LME7 burner management systems
- Durable construction suitable for harsh industrial environments with an IP65 protection rating
- Side-viewing design provides flexibility for various burner mounting and viewing configurations
Specifications
- Model: QRA73.A17
- Operating Voltage: AC 120 V (50/60 Hz)
- Detector Tube Length: 125 mm
- Sensitivity: Normal
- Power Consumption: Approximately 3.4 VA
- Net Weight: 0.680 kg (1.5 lbs)
- Protection Class: IP65
- Country of Origin: Germany
Applications
- Continuous or intermittent supervision of gas and oil flames in industrial burners
- Monitoring of ignition sparks in high-demand combustion systems
- Use in HVAC systems and boiler plants requiring LMV5 or LME7 burner controls
- Application in commercial heating environments where fail-safe flame detection is required



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