QRB1A-A070B70A2 Siemens Flame Sensor

Overview

The Siemens QRB1A-A070B70A2 is a photoresistive flame detector designed for the supervision of yellow-burning oil flames in intermittent operation. This compact sensor is specifically engineered to detect radiation in the visible light spectrum, with a maximum spectral sensitivity of approximately 600 nm. It is a critical safety component used in conjunction with Siemens burner controls to ensure reliable flame monitoring in industrial and commercial combustion systems.

Features

• Photoresistive sensing technology optimized for visible light radiation of oil flames
• Normal sensitivity rating with a black housing for easy identification
• Integrated 2-wire thermoplastic cable for straightforward electrical connection
• Designed for both frontal and lateral (90 degree) illumination to accommodate various burner mounting positions
• Vibration-free mounting achieved through a guide groove in the flange and a cam on the detector clamp
• Reliable performance in temperatures ranging from -20 C to +60 C

Specifications

• Model: QRB1A-A070B70A2
• Housing Length: 50 mm
• Cable Length: 70 cm
• Stripped Cable Length: 70 mm
• Protection Rating: IP40
• Sensitivity: Normal
• Casing Color: Black
• Weight: Approximately 0.048 kg
• Accessories: Includes small flange and clamp

Applications

• Supervision of yellow-burning oil flames in heating and thermal processing systems
• Compatible with Siemens burner controls including LAL, LME7, LMO, LMV, and LOA series
• Used in package burners, line burners, and industrial heating applications
• Ideal for OEMs integrating flame detection into new burner designs or for replacing existing QRB series sensors in maintenance cycles