QRB1B-A068B70B Siemens Flame Sensor

Overview

The Siemens QRB1B-A068B70B is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames. It operates by detecting the visible light radiation emitted by the flame, with a peak spectral sensitivity of approximately 600 nm. This compact sensor is engineered for intermittent operation and is a critical component in ensuring burner safety by providing reliable flame signaling to the burner control unit.

Features

• High sensitivity photoresistive element (indicated by the red casing) for precise flame detection
• Integrated soft plastic plug for simplified mounting in a standard burner hole with a lateral groove
• Flexible 2-wire thermoplastic cable with a visible length of 68 cm
• Designed for both frontal and lateral (90 degree) illumination to suit various burner configurations
• Sealing and securing ribs on the plug ensure a firm, vibration-free fit
• Durable construction suitable for industrial environments

Specifications

• Model: QRB1B-A068B70B
• Sensitivity: High (Red casing)
• Casing Length: 50 mm
• Visible Cable Length: 68 cm
• Stripped Length: 70 mm
• Connection Type: Plug-in with ferrules (no connector)
• Protection Rating: IP40
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.023 kg to 0.032 kg
• Spectral Sensitivity: Maximum approximately 600 nm

Applications

• Supervision of yellow-burning oil flames in commercial and industrial heating systems
• Used in connection with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
• Suitable for intermittent burner operation
• Ideal for OEM integration into package burners and boiler systems
• Can be used as a replacement for QRB1B-A033B40B in certain configurations