QRB4A-B110B70 Siemens Flame Sensor

Overview

The Siemens QRB4A-B110B70 is a high-quality photoresistive flame detector designed for the supervision of yellow-burning oil flames. This compact sensor operates within the visible light spectrum and is intended for use with Siemens burner controls in intermittent operations. It is an essential safety component that ensures reliable flame detection to prevent hazardous conditions in industrial and commercial heating systems.

Features

• High-precision photoresistive sensing element optimized for visible light radiation
• Designed for both frontal and lateral (90 degree) light entry for flexible mounting
• Compact design with a durable black thermoplastic housing
• Equipped with a 2-wire infused cable for secure electrical connection
• Normal sensitivity calibration suitable for a wide range of oil-fired burners
• Integrated guide spring or groove mechanism to ensure correct alignment with the flame

Specifications

• Model: QRB4A-B110B70
• Manufacturer Number: S55723-S219-A100
• Sensitivity: Normal
• Spectral Sensitivity: Approximately 540 nm to 600 nm
• Casing Color: Black
• Casing Length: 68 mm
• Visible Cable Length: 110 cm
• Stripped Cable Length: 70 mm
• Cable End: With ferrule (skinned)
• Mounting: Without accessories (flange and clamp typically optional or separate)

Applications

• Supervision of yellow-burning oil flames in industrial burner systems
• Use in connection with Siemens burner control types LAL, LME7, LMO, LMV2, LMV3, and LOA
• Ideal for intermittent burner operations in HVAC and boiler applications
• Suitable for OEMs integrating flame detection into specialized heating products