Siemens QRB3 Series Photoresistive Flame Detectors
Product Description
Siemens QRB3 Series Photoresistive Oil Flame Detectors
Siemens QRB3 Series detectors use photoresistive sensing technology to supervise yellow-burning oil flames through visible-light radiation. They provide flame detection signals to compatible burner control units during combustion operation.
Designed primarily for intermittently operated oil burners, QRB3 detectors work with specified Siemens LAL, LME7, LMO, LMV and LOA burner controllers. Their compact protective tube enables installation in suitable industrial burner and boiler assemblies.
Key Features
- Photoresistive flame monitoring for yellow-burning oil flames
- Responds to flame radiation within the visible-light spectrum
- Peak spectral sensitivity of approximately 600 nm
- Supports frontal and 90° lateral light reception
- Metal protective tube with 17 mm outside diameter
- Flange-and-clamp mounting arrangement
- Normal-sensitivity and high-sensitivity detector options
- IP40 enclosure protection and electrical Safety Class II
Photoresistive Detection Principle
The QRB3 incorporates a light-sensitive resistor that responds to visible radiation from an oil flame. Without illumination, its electrical resistance is in the megaohm range. As incident light increases, resistance decreases into the kilohm range. The connected burner control interprets this resistance change to determine flame presence.
Industrial Applications
- Industrial oil-fired burner installations
- Industrial steam boiler combustion systems
- Oil-fired industrial heating equipment
- Combustion systems fitted with compatible Siemens burner controllers
Selection Guidance: Check the exact burner controller model, required detector sensitivity, installation orientation and mounting accessories before specifying a Siemens QRB3 flame detector.
Specifications
Siemens QRB3 Series Photoresistive Flame Detector Technical Data
| Manufacturer | Siemens |
|---|---|
| Product Family | QRB3 Series |
| Detector Classification | Photoresistive Flame Detector |
| Primary Application | Yellow-burning oil flame supervision |
| Optical Detection Band | Visible light spectrum |
| Peak Spectral Sensitivity | Approximately 600 nm |
| Light Reception Direction | Frontal or lateral (90°) |
| Compatible Siemens Burner Controls | Siemens LAL, LME7, LMO, LMV, LOA |
| Protective Sensor Tube | Metal, 17 mm external diameter |
| Detector Housing Color | Green |
| Ingress Protection | IP40 |
| Electrical Safety Classification | II |
| Permitted Mounting Orientation | Optional |
| Recommended Connection Cable | H05VV-F 2 x 0.75 mm² |
| Approximate Detector Weight | 35 g (without cable) |
| Operating Ambient Temperature | -20 to +60 °C |
| Permissible Relative Humidity | <95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
Siemens QRB3 Model Comparison
| Detector Model | Detection Sensitivity | Flange and Clamp |
|---|---|---|
| QRB3 | Normal | Not included |
| QRB3(1) | Normal | Included |
| QRB3S | High | Not included |
Mounting Accessories
- Metal Flange: 4 286 1490 0
- Metal Clamp: 4 186 8806 0
Technical Reference: Siemens Data Sheet CC1N7714en, dated 23.11.2017. Verify the detector variant, required mounting accessories and burner control compatibility before ordering.
Product Specifications
Siemens QRB3 Series Photoresistive Flame Detector Technical Data
| Manufacturer | Siemens |
|---|---|
| Product Family | QRB3 Series |
| Detector Classification | Photoresistive Flame Detector |
| Primary Application | Yellow-burning oil flame supervision |
| Optical Detection Band | Visible light spectrum |
| Peak Spectral Sensitivity | Approximately 600 nm |
| Light Reception Direction | Frontal or lateral (90°) |
| Compatible Siemens Burner Controls | Siemens LAL, LME7, LMO, LMV, LOA |
| Protective Sensor Tube | Metal, 17 mm external diameter |
| Detector Housing Color | Green |
| Ingress Protection | IP40 |
| Electrical Safety Classification | II |
| Permitted Mounting Orientation | Optional |
| Recommended Connection Cable | H05VV-F 2 x 0.75 mm² |
| Approximate Detector Weight | 35 g (without cable) |
| Operating Ambient Temperature | -20 to +60 °C |
| Permissible Relative Humidity | <95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
Siemens QRB3 Model Comparison
| Detector Model | Detection Sensitivity | Flange and Clamp |
|---|---|---|
| QRB3 | Normal | Not included |
| QRB3(1) | Normal | Included |
| QRB3S | High | Not included |
Mounting Accessories
- Metal Flange: 4 286 1490 0
- Metal Clamp: 4 186 8806 0
Technical Reference: Siemens Data Sheet CC1N7714en, dated 23.11.2017. Verify the detector variant, required mounting accessories and burner control compatibility before ordering.
Company Information
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