QRB1A-A050B70A2 Siemens Flame Sensor

Overview

The Siemens QRB1A-A050B70A2 is a compact photoresistive flame detector specifically designed for the supervision of yellow-burning oil flames. This sensor is a critical safety component used in conjunction with burner controls to detect the presence of a stable flame during burner operation. It features a black casing and is engineered for both frontal and lateral illumination, ensuring flexible mounting options within industrial and commercial burner systems.

Features

• Photoresistive sensing technology optimized for visible light radiation of yellow-burning oil flames
• Normal sensitivity levels for reliable flame supervision
• Compact mechanical design with a 50 mm housing length
• Supports both frontal and lateral (90 degree) light entry
• Vibration-free mounting facilitated by a guide groove and securing flange
• Integrated 2-wire thermoplastic cable for straightforward electrical connection

Specifications

• Model: QRB1A-A050B70A2
• Sensing Type: Photoresistive
• Sensitivity: Normal
• Spectral Sensitivity: Maximum approximately 600 nm
• Casing Length: 50 mm
• Cable Length: 50 cm
• Stripped Cable Ends: 70 mm
• Casing Color: Black
• Accessories: Typically supplied with a large flange and clamp

Applications

• Supervision of yellow-burning oil flames in burner systems
• Compatible with Siemens burner control series including LAL, LME7, LMO, LMV, and LOA
• Used in industrial heating and thermal processing systems
• Suitable for commercial oil-fired boiler and package burner applications
• Essential component for combustion safety loops to prevent fuel accumulation without a flame