QRB1A-A148B70B Siemens Flame Sensor

Overview

The Siemens QRB1A-A148B70B is a compact, photoresistive flame detector designed for the supervision of yellow-burning oil flames in intermittent operation. This light-sensitive sensor works in conjunction with various Siemens burner controls to detect radiation in the visible light spectrum. It features a black housing indicating normal sensitivity and comes equipped with a soft plastic plug for simplified mounting. The detector is engineered to provide a critical safety function by ensuring the presence of a flame during the combustion process, helping to prevent hazardous conditions in industrial and commercial burner systems.

Features

• Photoresistive light-sensitive element optimized for yellow-burning oil flames
• Maximum spectral sensitivity of approximately 600 nm to capture visible light radiation
• Normal sensitivity rating with a distinctive black casing for easy identification
• Integrated 2-wire thermoplastic cable for durable electrical connectivity
• Soft plastic plug design for secure, vibration-free mounting in a burner hole with a lateral groove
• Compatible with a wide range of Siemens burner controls, including LAL, LME7, LMO, LMV, and LOA series
• Suited for both frontal and lateral (90 degree) illumination depending on mounting orientation

Specifications

• Model: QRB1A-A148B70B
• Sensitivity: Normal
• Casing Color: Black
• Casing Length: 50 mm
• Visible Cable Length: 148 cm
• Stripped Cable Length: 70 mm
• Cable Type: 2-wire thermoplastic (2 x 0.75 mm2)
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.25 kg

Applications

• Supervision of yellow-burning oil flames in industrial and commercial heating systems
• Used primarily in oil burner applications with intermittent operation cycles
• Integration into burner systems managed by Siemens LMV, LMO, or LAL series controllers
• Suitable for burners requiring a plug-in style sensor for easy installation and maintenance