QRB1B-A050B70A2 Siemens Flame Sensor

Overview

The Siemens QRB1B-A050B70A2 is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames in burner systems. This compact sensor monitors the combustion chamber for a flame signal and provides monitored feedback to the burner control unit. Engineered for intermittent operation, it ensures a critical safety function by initiating a burner lockout if the flame signal is lost or if extraneous light is detected during the start-up sequence.

Features

• High-sensitivity photoresistive sensing element specifically tuned for yellow-burning oil flames
• Red casing indicates high sensitivity for easy identification
• Integrated 2-wire thermoplastic cable for simple electrical connection
• Designed for both frontal and lateral (90 degree) illumination
• Compact 50 mm housing suitable for installation in space-constrained burner designs
• Supplied with a large flange and clamp for secure, vibration-free mounting

Specifications

• Model: QRB1B-A050B70A2
• Sensing Type: Photoresistive
• Spectral Sensitivity: Maximum approximately 600 nm
• Sensitivity Level: High (Red casing)
• Housing Length: 50 mm
• Cable Length: 50 cm
• Stripped Lead Length: 70 mm
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C

Applications

• Supervision of yellow-burning oil flames in industrial and commercial burners
• Used in conjunction with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Integration into combustion safety loops for oil-fired boiler systems
• Suitable for various burner brands including Ecoflam, Grant, and Thermecon