QRB1A-A050B40A Siemens Flame Sensor

Overview

The Siemens QRB1A-A050B40A is a compact photoresistive flame detector designed for the supervision of yellow-burning oil flames. This sensor is engineered for use with Siemens burner controls in intermittent operation, providing reliable flame detection by monitoring the visible light spectrum. It is a critical safety component that ensures the presence of a flame during burner operation, preventing the accumulation of unburned fuel.

Features

• High-precision photoresistive sensing element optimized for visible light radiation
• Compact mechanical design with an infused 2-wire thermoplastic cable
• Designed for both frontal and lateral 90 degree illumination
• Black plastic housing with normal sensitivity to suit standard oil burner applications
• Vibration-free mounting when used with compatible securing flanges and clamps
• High spectral sensitivity focused at approximately 600 nm to match yellow oil flames

Specifications

• Model: QRB1A-A050B40A
• Sensitivity: Normal
• Casing Color: Black
• Casing Length: 50 mm
• Visible Cable Length: 50 cm
• Stripped Cable Length: 40 mm
• Spectral Sensitivity: Approximately 600 nm
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Connection Type: 2-wire thermoplastic cable without plug

Applications

• Supervision of yellow-burning oil flames in industrial and commercial burners
• Used in conjunction with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Suitable for systems operating in intermittent mode where the burner must be shut down at least once every 24 hours
• Integration into burner units via flange mounting for precise alignment with the flame source