Overview
The Siemens QRB3(1) is a photoresistive flame detector designed for the supervision of yellow-burning oil flames in the visible light spectrum. It is primarily used with Siemens burner controls for small to medium-capacity burners operating in intermittent cycles. This specific model features a metal protective tube and is supplied with a securing flange and clamp to ensure precise, vibration-free alignment toward the flame.
Features
- Photoresistive sensing element with maximum spectral sensitivity at approximately 600 nm
- Normal sensitivity rating, identified by a black casing
- Integrated metal protective tube with a 17 mm external diameter
- Includes a metal securing flange and clamp for stable mounting
- Designed for both frontal and lateral (90 degree) illumination
- Durable construction suitable for industrial environments
Specifications
- Model: QRB3(1)
- Sensing Type: Photoresistive
- Sensitivity: Normal
- Spectral Sensitivity: Approximately 600 nm
- Protection Rating: IP40
- Operating Temperature: -20 C to +60 C
- Weight: Approximately 35 g (without cable)
- Mounting: Small flange and clamp included
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
- Suitable for intermittent burner operation
- Ideal for OEMs integrating flame detection into small capacity burner products


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