QRB1C-D048B40B Siemens Flame Sensor

Overview

The Siemens QRB1C-D048B40B is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames. Engineered for use with Siemens burner controls in intermittent operation, this compact sensor captures visible light radiation to ensure safe and efficient burner performance. It features a specialized “glass bubble” construction that enhances light collection, allowing it to detect even faint flickers of flame and providing a critical safety layer by preventing the accumulation of unburned fuel.

Features

• High-sensitivity photoresistive element optimized for the visible light spectrum (maximum spectral sensitivity approximately 600 nm)
• Integrated soft plastic plug for simplified mounting in a standard hole with a lateral groove
• Red casing color typically indicates high sensitivity and provides clear identification in industrial settings
• Robust design including a glass bubble for optimal light entry and a durable housing to withstand high-temperature environments
• Compatible with a wide range of Siemens burner controls, including LAL, LME7, LMO, LMV, and LOA series
• Designed for both frontal and lateral (90 degree) illumination

Specifications

• Model: QRB1C-D048B40B
• Sensitivity: High (Red casing)
• Casing Length: 105 mm (Type C)
• Visible Cable Length: 48 cm
• Stripped Length: 40 mm
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 2 lbs (0.9 kg)
• Mounting: Soft plastic plug with sealing and securing ribs

Applications

• Supervision of yellow-burning oil flames in residential and commercial heating systems
• Industrial burner applications such as diesel burners and boiler operations
• Integration with Siemens burner management systems for safety shut-off control
• Suited for use in environments where precise flame monitoring is required to prevent nuisance trips or delayed detection