QRB1A-A070B70A Siemens Flame Sensor

Overview

The Siemens QRB1A-A070B70A is a compact photoresistive flame detector designed for the supervision of yellow-burning oil flames. It is engineered primarily for use with Siemens burner controls in intermittent operation. This high-precision sensor monitors the visible light spectrum to ensure reliable flame detection, providing a critical safety function by signaling the presence of a flame to the burner control box.

Features

• Photoresistive flame detecting element with a spectral sensitivity maximum of approximately 600 nm
• Normal sensitivity rating suitable for standard oil-fired burner applications
• Designed for both frontal and lateral (90 degree) illumination
• Durable black plastic casing protects the sensitive internal components
• Compact design allows for easy integration into various burner configurations
• Vibration-free mounting when used with compatible securing flanges and clamps

Specifications

• Model: QRB1A-A070B70A
• Housing Length: 50 mm
• Visible Cable Length: 70 cm
• Stripped Length: 70 mm
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.032 kg
• Connection: 2-wire thermoplastic cable with ferrules, without plug

Applications

• Supervision of yellow-burning oil flames in industrial and commercial burners
• Used in connection with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Suited for intermittent burner operation in HVAC and boiler systems
• Ideal for OEM integration into oil-fired heating equipment requiring reliable flame supervision