QRB1B-A050B70A Siemens Flame Sensor

Overview

The Siemens QRB1B-A050B70A is a compact, photoresistive flame detector designed for the supervision of yellow-burning oil flames in intermittent operation. This high-sensitivity sensor is a critical safety component used in conjunction with Siemens burner controls to ensure reliable flame presence detection. It features a photoresistive sensing element that reacts to the visible light spectrum of oil flames, providing essential feedback to the burner management system to prevent hazardous conditions.

Features

• High-sensitivity photoresistor element designed to detect yellow-burning oil flames
• Red casing for easy identification of high-sensitivity model type
• Compact 50mm body length for installation in space-restricted burner environments
• Integrated soft plastic plug for secure mounting and alignment within the burner hole
• Infused 2-wire thermoplastic cable for durable electrical connection
• Spectral sensitivity optimized at approximately 600 nm for visible light radiation
• Protection rating of IP40 for standard industrial indoor applications

Specifications

• Model: QRB1B-A050B70A
• Type: Photoresistive Flame Detector
• Sensitivity: High (Red casing)
• Housing Length: 50 mm
• Visible Cable Length: 50 cm
• Stripped End Length: 70 mm
• Operating Temperature: -20 C to +60 C
• Mounting: Soft plastic plug with sealing and securing ribs
• Protection Class: IP40
• Spectral Sensitivity: Maximum approximately 600 nm

Applications

• Supervision of yellow-burning oil flames in residential and commercial heating systems
• Used in conjunction with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Suitable for both frontal and lateral (90 degree) illumination mounting configurations
• Integrated into oil burner safety loops to monitor flame stability and presence
• Ideal for OEMs and replacement in existing HVAC and industrial burner installations