QRA53.G27 Siemens Sensor

Overview

The Siemens QRA53.G27 is a high-sensitivity ultraviolet (UV) flame detector designed for the continuous supervision of gas and oil flames. Engineered for industrial combustion environments, this self-checking sensor ensures reliable flame detection and ignition spark proving. It is specifically designed to integrate with Siemens burner control units, such as the LGK16 and LGI16, providing a critical safety function by monitoring for the presence of a flame and preventing hazardous conditions in high-demand or 24-hour burner operations.

Features

• Self-checking mechanism with an integrated stepper motor and swiveling shutter periodically tests the UV cell’s responsiveness
• High-sensitivity UV photodiode designed to detect gas flames and blue or yellow burning oil flames
• Durable die-cast aluminum housing with an IP65 protection rating for demanding industrial environments
• Integrated mounting coupling with a connection facility for cooling air to extend the life of the UV cell
• Quartz-glass window protects the internal UV tube and shutter from dirt and heat
• Bayonet fitting allows for direct mounting or use with additional accessories like glass holders and adapters

Specifications

• Model: QRA53.G27
• Mains Voltage: AC 220 V to 240 V (50/60 Hz)
• Sensitivity: High
• Detector Tube Length: 125 mm
• Protection Rating: IP65
• Operating Temperature: -20 C to +60 C
• Spectral Sensitivity: Approximately 190 to 270 nm
• Replacement UV Cell: AGR4 502 4065 0
• Connection: Requires AGM19 connecting cable

Applications

• Supervision of gas flames and yellow or blue burning oil flames in industrial burners
• Ignition spark proving for combustion systems
• Monitoring of “green fuel” blends, such as hydrogen-oil mixes
• Use in systems requiring continuous operation (more than 24 hours without shutdown)
• Integration with Siemens LGK16 and LGI16 burner management controllers