QRB1B-D042B20B Siemens Flame Sensor

Overview

The Siemens QRB1B-D042B20B is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames in intermittent burner operations. This compact sensor is engineered to work in conjunction with Siemens burner controls to ensure safe and reliable combustion by monitoring the visible light spectrum of the flame. It features a robust design suitable for industrial and commercial heating applications, providing critical safety feedback by detecting the presence or absence of a flame during the burner cycle.

Features

• High sensitivity photosensitive element optimized for yellow-burning oil flames
• Integrated soft plastic plug for simplified mounting in burner housings with a lateral groove
• Red casing color for easy identification of high-sensitivity models
• Durable construction resistant to thermal stress and corrosion in high-temperature environments
• Designed for both frontal and lateral (90 degree) illumination
• Reliable performance when used with Siemens LAL, LME7, LMO, LMV, and LOA burner controls

Specifications

• Model: QRB1B-D042B20B
• Sensitivity: High (Red casing)
• Casing Length: 137 mm
• Visible Cable Length: 42 cm
• Stripped Length: 20 mm
• Spectral Sensitivity: Maximum approximately 600 nm
• Protection Rating: IP40
• Operating Temperature Range: -20 C to +60 C
• Connection Type: 2-wire thermoplastic cable with ferrules and soft plastic plug

Applications

• Supervision of yellow-burning oil flames in industrial and commercial burners
• Used in intermittent burner operations to provide safety shut-off control
• Compatible with Siemens burner management systems like the LMV5 or LME series
• Suitable for diesel burner fire detection and monitoring in boiler systems
• Ideal for OEM integration into specialized combustion equipment requiring sensitive flame detection