QRA53.E27 Siemens Sensor

Overview

The Siemens QRA53.E27 is a self-checking ultraviolet (UV) flame detector specifically engineered for continuous operation in high-demand burner systems. It is designed to provide high-precision supervision of gas and oil flames, ensuring safety by monitoring the presence of the flame and preventing the flow of fuel if a flame is not detected. This sensor is built with a rugged die-cast aluminum housing and features an integrated shutter mechanism for periodic self-testing of the UV cell, making it suitable for industrial environments where reliable, uninterrupted flame monitoring is critical.

Features

• Self-checking mechanism with an integrated stepper motor and shutter for continuous flame supervision
• High-sensitivity UV photodiode capable of detecting gas, yellow or blue oil flames, and ignition sparks
• Durable die-cast aluminum housing provides robust protection for sensitive electronic components
• Integrated quartz-glass window protects the internal UV cell and shutter from dirt and debris
• NEMA 4 and IP65 protection ratings ensure performance in harsh industrial conditions
• Equipped with a 125mm detector tube for optimal positioning in various burner configurations

Specifications

• Model: QRA53.E27
• Mains Voltage: AC 220–240 V (50/60 Hz)
• Detector Tube Length: 125 mm
• Sensitivity: Normal
• Protection Rating: IP65 / NEMA 4
• Operating Mode: Continuous
• Spectral Sensitivity: 190 to 270 nm
• Ambient Temperature Range: -20°C to +60°C
• Spare UV Tube: AGR4 502 4065 0
• Weight: Approximately 0.7 kg to 0.83 kg

Applications

• Supervision of gas-fired and oil-fired burners in industrial and commercial settings
• Continuous flame monitoring for high-demand burner cycles in HVAC and boiler systems
• Detection of ignition sparks for reliable burner starting sequences
• Use in combination with Siemens burner controls such as the LGK16 or LGI16 series
• Implementation in combustion chamber viewing holes or viewing tubes using specific mounting adapters like the AGG16.C