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



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