Overview
The Siemens QRB1B-A017A25B is a high-sensitivity photoresistive flame detector designed for the supervision of yellow-burning oil flames. This compact sensor is engineered for intermittent operation and works by detecting the visible light spectrum of the flame. It features a soft plastic plug for simplified mounting directly into a burner hole, ensuring a secure and aligned fit. As a critical safety component, it is typically used in conjunction with Siemens burner controls to provide reliable flame monitoring in industrial and commercial heating systems.
Features
- High-sensitivity photoresistive element (red casing) for detecting yellow-burning oil flames
- Soft plastic plug design for easy push-in mounting without the need for additional flanges
- Integrated guide spring ensures correct alignment of the sensor toward the flame
- Compact 50mm housing length suitable for tight burner configurations
- Flexible 2-wire thermoplastic cable with stripped ends for easy wiring
- Selective spectral sensitivity (peaking at 600 nm) to prioritize visible light from oil flames
Specifications
- Model: QRB1B-A017A25B
- Sensitivity: High (Red casing)
- Housing Length: 50 mm
- Visible Cable Length: 17 cm
- Stripped End Length: 25 mm
- Spectral Sensitivity: Approximately 600 nm
- Protection Rating: IP40
- Operating Temperature: -20 C to +60 C
- Weight: Approximately 0.25 kg
- Mounting: Soft plastic plug with sealing and securing ribs
Applications
- Supervision of yellow-burning oil flames in intermittent operation
- Used with Siemens burner controls such as LAL, LME7, LMO, LMV, and LOA series
- Ideal for residential and industrial oil burners requiring high-sensitivity detection
- Frontal and lateral (90 degree) illumination monitoring in combustion systems


Reviews
There are no reviews yet.