Overview
The Siemens QRB1A-A070B70A is a compact photoresistive flame detector designed for the supervision of yellow-burning oil flames. It is engineered primarily for use with Siemens burner controls in intermittent operation. This high-precision sensor monitors the visible light spectrum to ensure reliable flame detection, providing a critical safety function by signaling the presence of a flame to the burner control box.
Features
- Photoresistive flame detecting element with a spectral sensitivity maximum of approximately 600 nm
- Normal sensitivity rating suitable for standard oil-fired burner applications
- Designed for both frontal and lateral (90 degree) illumination
- Durable black plastic casing protects the sensitive internal components
- Compact design allows for easy integration into various burner configurations
- Vibration-free mounting when used with compatible securing flanges and clamps
Specifications
- Model: QRB1A-A070B70A
- Housing Length: 50 mm
- Visible Cable Length: 70 cm
- Stripped Length: 70 mm
- Protection Rating: IP40
- Operating Temperature: -20 C to +60 C
- Weight: Approximately 0.032 kg
- Connection: 2-wire thermoplastic cable with ferrules, without plug
Applications
- Supervision of yellow-burning oil flames in industrial and commercial burners
- Used in connection with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
- Suited for intermittent burner operation in HVAC and boiler systems
- Ideal for OEM integration into oil-fired heating equipment requiring reliable flame supervision


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