QRB3 Siemens Flame Detector

Overview

The Siemens QRB3 is a photo-resistive flame detector designed for the supervision of yellow-burning oil flames in the visible light spectrum. It is primarily used in conjunction with burner controls for intermittent operation in small to medium-capacity burners. The sensor utilizes a photo-resistor that changes resistance based on light intensity, allowing it to accurately detect the presence of a flame during the combustion process.

Features

• High-sensitivity photo-resistive element designed for yellow-burning oil flames
• Metal protective tube with a 17 mm external diameter for enhanced durability
• Compatible with a wide range of Siemens and Landis & Gyr burner controls, including LAL, LME7, LMO, LMV, and LOA series
• Suited for both frontal and lateral (90-degree) illumination to accommodate various burner mounting configurations
• Compact mechanical design with an optional securing flange and clamp for vibration-free mounting
• Maximum spectral sensitivity of approximately 600 nm to capture visible light radiation efficiently

Specifications

• Sensitivity: Normal
• Spectral Sensitivity: Maximum approximately 600 nm
• Degree of Protection: IP40
• Operating Temperature Range: -20 C to +60 C
• Protective Tube Diameter: 17 mm
• Weight: Approximately 35 g (without cable)
• Mounting Position: Optional (any orientation)
• Cable Type: 2-wire thermoplastic cable

Applications

• Monitoring and supervision of oil flames in industrial and commercial burners
• Used by Original Equipment Manufacturers (OEMs) for integration into burner systems
• Suitable for intermittent operation cycles where the burner restarts at least once every 24 hours
• Ideal for small-capacity burners requiring precise visible light flame detection