Overview
The Siemens QRA53.E17 is a high-performance ultraviolet (UV) flame detector designed for the continuous supervision of gas or oil flames and for ignition spark proving. Engineered for industrial environments, this self-checking sensor ensures maximum safety by monitoring the intensity of burner flame radiation and providing a constant signal to the control system. It is specifically designed to work with Siemens burner controls, such as the LGK16 and LGI16 series, and features a robust NEMA 4 rated housing to protect against water and dust ingress in demanding applications.
Features
- Self-checking mechanism allows for continuous flame supervision without interruption
- Normal sensitivity UV photodiode designed to detect gas flames and blue or yellow burning oil flames
- Integrated stepper motor and swiveling shutter system for periodic testing of the UV cell
- Durable NEMA 4 and IP65 rated housing ensures reliability in weatherproof and industrial environments
- Protective quartz-glass window prevents dirt ingress to the shutter and tube
- Designed for frontal illumination with a 125mm sleeve length
Specifications
- Model: QRA53.E17
- Mains Voltage: AC 100 V to 110 V (50/60 Hz)
- Detector Tube Length: 125 mm
- Sensitivity: Normal
- Protection Rating: IP65 / NEMA 4
- Operating Mode: Continuous
- Ambient Temperature Range: -20 C to +60 C
- Average Life of UV Cell: 10,000 hours (below 50 C)
- Replacement UV Cell: AGR4 502 4065 0
- Weight: Approximately 0.75 kg (1.65 lbs)
Applications
- Supervision of gas flames and yellow or blue burning oil flames in industrial burners
- Ignition spark proving in high-demand combustion systems
- Use with Siemens burner controls type LGK16 or LGI16
- Weatherproof and outdoor industrial installations requiring NEMA 4 protection
- Continuous or intermittent burner operations in HVAC and boiler systems



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