QRB1B-A070B70A2 Siemens Flame Sensor

Overview

The Siemens QRB1B-A070B70A2 is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames. It is typically used in conjunction with Siemens burner controls, such as the LAL, LME7, LMO, LMV, and LOA series. This compact sensor is engineered for intermittent operation and detects radiation in the visible light spectrum, with a peak spectral sensitivity of approximately 600 nm to ensure reliable flame monitoring in industrial and commercial combustion systems.

Features

• High-sensitivity photoresistive element for precise oil flame detection
• Integrated 2-wire thermoplastic cable with ferrules for straightforward wiring
• Red housing to signify high sensitivity for easier identification
• Vibration-free mounting via a guide groove in the securing flange and a cam on the detector clamp
• Support for both frontal and lateral (90 degree) illumination depending on the mounting configuration
• Compact design suitable for installation in tight burner spaces

Specifications

• Model: QRB1B-A070B70A2
• Sensitivity: High (Red casing)
• Housing Length: 50 mm
• Visible Cable Length: 70 cm
• Stripped Cable Length: 70 mm
• Connector: Supplied with ferrules (no plug or strain relief)
• Mounting Accessories: Small flange and clamp included
• Spectral Sensitivity: Maximum approximately 600 nm

Applications

• Supervision of yellow-burning oil flames in commercial and industrial burners
• Used in intermittent burner operations
• Integration with Siemens burner control models including LAL, LME7, LMO, LMV, and LOA
• Suitable for HVAC and boiler systems requiring reliable combustion safety loops