QRA55.G27 Siemens Sensor

Overview

The Siemens QRA55.G27 is a high-sensitivity ultraviolet (UV) flame detector designed for continuous operation in industrial and commercial burner systems. It is engineered to supervise gas flames, yellow or blue-burning oil flames, and to provide ignition spark proving. Housed in a durable die-cast aluminum enclosure, this sensor is built to withstand demanding environments and is a critical safety component when paired with compatible Siemens burner controls like the LGK16 or LGI16.

Features

• Self-checking UV sensor designed for continuous or intermittent operation
• High sensitivity ultraviolet photodiode for reliable detection across various fuel types
• Integrated stepper motor and swiveling shutter mechanism for periodic testing of the UV cell
• Durable die-cast aluminum housing providing an IP65 protection rating
• NEMA 4 rated for protection against dust and water ingress
• Equipped with a quartz-glass window to protect the internal shutter and tube from dirt and debris
• Integrated connection facility for cooling air to extend the service life of the UV cell

Specifications

• Model: QRA55.G27
• Mains Voltage: AC 220 to 240 V (50/60 Hz)
• Sensitivity: High
• Detector Tube Length: 69 mm
• Protection Rating: IP65 / NEMA 4
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.7 kg (1.5 lbs)
• Spare UV Tube: AGR4 502 4065 0
• Required Accessories: Requires AGM19 connecting cable and AGG16.C adapter for mounting

Applications

• Supervision of gas flames and yellow or blue burning oil flames in industrial burners
• Ignition spark proving for high-capacity combustion systems
• Use in continuous operation burner controls, specifically Siemens LGK16 and LGI16 series
• Integration into gas trains of gas-fired equipment and oil-burning HVAC systems
• Suitable for mounting directly on the burner, on a viewing tube, or on a combustion chamber viewing hole