QRA55.E27 Siemens Sensor

Overview

The Siemens QRA55.E27 is a high-precision 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 performing periodic functional tests of its UV cell using an integrated motorized shutter. It is specifically designed to work with Siemens burner controls such as the LGK16 and LGI16 series, providing reliable flame detection for burners that operate for more than 24 hours without a shutdown.

Features

• Self-checking mechanism with an integrated stepper motor and swiveling shutter for continuous operation testing
• Normal sensitivity UV photodiode optimized for gas flames and blue or yellow burning oil flames
• Robust die-cast aluminum housing designed for durability in demanding industrial settings
• IP65 protection rating ensuring resistance against dust and water jets
• Integrated quartz-glass window to protect the internal UV cell and shutter from dirt and thermal stress
• Compact 69mm tube length suitable for specialized burner mounting configurations

Specifications

• Model: QRA55.E27
• Mains Voltage: AC 220–240 V (50/60 Hz)
• Detection Type: Ultraviolet (UV)
• Spectral Sensitivity: 190 to 270 nm
• Detector Tube Length: 69 mm
• Sensitivity Level: Normal
• Operating Mode: Continuous / Self-checking
• Protection Rating: IP65
• Temperature Range: -20 °C to +60 °C
• Average UV Cell Life: Approximately 10,000 hours
• Weight: Approximately 0.7 kg

Applications

• Continuous supervision of gas-fired and oil-fired industrial burners
• Ignition spark proving in high-demand combustion systems
• Use in systems where burners operate for more than 24 hours without interruption
• Compatible with Siemens LGK16 and LGI16 burner management systems
• Suitable for compact burner designs requiring a shorter detector tube length