QRA55.G17 Siemens Sensor

Overview

The Siemens QRA55.G17 is a high-sensitivity ultraviolet (UV) flame detector designed for the continuous supervision of gas flames and yellow or blue-burning oil flames. Engineered for industrial and commercial burner applications, this self-checking sensor ensures high operational safety by detecting the UV radiation emitted by flames. It is specifically designed to work in conjunction with Siemens burner controls, such as the LGK16 or LGI16, providing a critical safety link in high-demand combustion systems.

Features

• Self-checking mechanism allows for continuous operation without safety interruptions
• High-sensitivity UV cell for reliable detection in difficult sighting conditions or low-radiation flames
• Integrated stepper motor drives a swiveling shutter for periodic self-testing of the UV cell
• Durable die-cast aluminum housing with a NEMA 4 / IP65 protection rating for harsh environments
• Built-in connection facility for cooling air to protect the sensor in high-temperature applications
• Swiveling shutter and quartz-glass window protect the internal UV cell from dust and dirt

Specifications

• Model: QRA55.G17
• Operating Voltage: AC 100 V to 110 V (50/60 Hz)
• Sensitivity: High
• Detector Tube Length: 69 mm
• Protection Rating: IP65 (NEMA 4 equivalent)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.6 lbs (0.74 kg)
• Average Life of UV Cell: 10,000 hours
• Spare UV Tube: AGR4 502 4065 0

Applications

• Supervision of gas and oil flames in industrial burners and commercial boilers
• Ignition spark proving for burner systems
• Continuous or high-demand burner operations requiring self-supervision
• Use with Siemens LGK16… and LGI16… burner control units
• Mounting on burners, viewing tubes, or combustion chamber viewing holes via AGG16.C adapter