QRB1A-A050B70A Siemens Flame Sensor

Overview

The Siemens QRB1A-A050B70A is a compact photoresistive flame detector designed for the supervision of yellow-burning oil flames. It operates by sensing the visible light spectrum and is typically used in conjunction with Siemens oil burner controls for intermittent operation. This high-precision sensor acts as a critical safety device, communicating with burner control boxes to ensure stable combustion and preventing hazards by detecting the absence of a flame or the presence of stray flames within the combustion chamber.

Features

• Photoresistive sensing element with maximum spectral sensitivity at approximately 600 nm
• Normal sensitivity calibrated specifically for yellow-burning oil flames
• Robust black thermoplastic housing with a 50 mm casing length
• Integrated 2-wire thermoplastic cable for simplified wiring
• Designed for both frontal and lateral (90 degree) light entry
• Vibration-free mounting capability when used with compatible securing flanges and clamps

Specifications

• Model: QRB1A-A050B70A
• Casing Length: 50 mm
• Visible Cable Length: 50 cm
• Stripped Cable Length: 70 mm
• Protection Rating: IP40
• Operating Temperature Range: -20 C to +60 C
• Weight: Approximately 0.029 kg
• Sensitivity: Normal

Applications

• Supervision of oil flames in commercial and industrial heating systems
• Use with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Integration into package burners, industrial furnaces, and boiler systems
• Compatible with various burner brands including Weishaupt, Ecoflam, and Riello