QRB1A-A050B70A1 Siemens Flame Sensor

Overview

The Siemens QRB1A-A050B70A1 is a photoresistive flame detector designed for the supervision of yellow-burning oil flames in intermittent operation. This compact sensor is a critical safety component that monitors light levels within a combustion chamber, communicating with burner control boxes to ensure the presence of a stable flame and prevent hazardous conditions. It is engineered for high durability and precision, making it a standard choice for various residential and industrial heating applications.

Features

• Photoresistive sensing element specifically tuned to the visible light spectrum of oil flames
• Normal sensitivity rating suitable for standard oil burner applications
• Robust black plastic housing designed for industrial environments
• Integrated 50cm two-wire thermoplastic cable for reliable signal transmission
• Includes a small mounting flange and clamp to ensure vibration-free and correctly aligned installation
• Compatible with a wide range of Siemens burner controls, including LAL, LME7, LMO, LMV, and LOA series

Specifications

• Model: QRB1A-A050B70A1
• Sensitivity: Normal
• Casing Color: Black
• Housing Length: 50 mm
• Visible Cable Length: 50 cm
• Stripped Cable Length: 70 mm
• Spectral Sensitivity: Approximately 600 nm
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.25 kg

Applications

• Supervision of yellow-burning oil flames in residential and commercial boilers
• Safety monitoring for industrial furnaces and combustion systems
• Use in intermittent burner operations to prevent fuel accumulation in the absence of a flame
• Suitable for frontal or lateral (90 degree) illumination mounting configurations
• Compatible with various burner brands including Aga Rayburn, Alpha, Ecoflam, and Waterford Stanley