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



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