QRA55.E17 Siemens Sensor

Overview

The Siemens QRA55.E17 is a self-checking ultraviolet (UV) flame detector designed for the supervision of gas or oil flames and for ignition spark proving in industrial burner systems. Engineered for continuous operation (more than 24 hours without interruption), this high-precision sensor utilizes a swivelling shutter and integrated stepper motor to perform periodic self-tests of the UV cell. It is particularly suited for high-demand applications where reliable flame detection is critical for safety, often used in conjunction with Siemens LGK16 or LGI16 burner controls.

Features

• Designed for continuous operation with integrated electronic self-supervision
• Normal sensitivity UV photodiode detects gas flames and blue or yellow burning oil flames
• Integrated stepper motor drives a shutter for periodic testing of the UV cell
• Weatherproof housing with NEMA 4 or IP54/IP65 protection ratings for industrial environments
• Quartz-glass window protects the internal components and shutter against dirt ingress
• Die-cast aluminum housing with a bayonet fitting for easy mounting and maintenance

Specifications

• Model: QRA55.E17
• Operating Voltage: AC 100 V to 110 V (50/60 Hz)
• Detector Tube Length: 69 mm (nominal)
• Sensitivity: Normal
• Protection Rating: IP54 or IP65 (depending on installation/accessories)
• Temperature Range: -20 C to +60 C
• Weight: Approximately 0.74 kg to 1.3 kg depending on packaging and accessories
• Spare UV Cell: AGR4 502 4065 0

Applications

• Supervision of gas flames and yellow or blue burning oil flames in industrial boilers
• Ignition spark proving in gas-fired or dual-fuel equipment
• Use with continuously operating oil or gas burners in HVAC and commercial heating systems
• Integration with Siemens burner controls type LGK16 and LGI16
• Suitable for mounting on burners, viewing tubes, or combustion chamber viewing holes