Siemens Photocell Detector QRA2 Series
Product Description
Siemens QRA2 Series – Ultraviolet Flame Detectors for Industrial Burners
Siemens QRA2 Series UV flame detectors monitor the presence of gas and oil flames in industrial combustion installations. The detectors sense ultraviolet radiation emitted during combustion and provide flame detection signals to compatible Siemens burner controls.
Designed for intermittent burner operation, QRA2 detectors are suitable for industrial boiler systems, process heating equipment and gas- or oil-fired burner installations requiring flame supervision.
UV Flame Detection Principle
The Siemens QRA2 contains a UV-sensitive cell that responds to ultraviolet radiation within the 190–270 nm wavelength band. When sufficient UV radiation reaches the sensing element, an electrical current is produced in the connected flame detection circuit.
The UV cell is not intended to respond to daylight, ordinary boiler room lighting or glowing refractory materials. However, external sources of ultraviolet radiation, including welding arcs and ignition sparks, may generate false flame indications. Correct installation and detector positioning are therefore essential.
Key Features
- Ultraviolet sensing technology for burner flame supervision
- Designed to monitor gas and oil flames
- Supports ignition spark proving applications
- Metallized plastic housing helps reduce electrostatic charging
- Suitable for direct installation on the burner
- Normal- and high-sensitivity versions available
- Optional mounting flange and clamp arrangements
- Works with selected Siemens burner management controls
Industrial Applications
- Industrial gas burner systems
- Industrial oil-fired burners
- Industrial steam and heating boilers
- Industrial process heating equipment
- Combustion flame supervision systems
Detector Selection Guidelines
Selection of a Siemens QRA2 detector should account for the required UV sensitivity, burner controller compatibility, mounting configuration, ambient temperature and installation conditions.
Verify compatibility with the exact burner control model using the relevant Siemens technical documentation before ordering or installation.
Important: The QRA2 Series is intended for intermittent burner operation. Installation, commissioning and servicing must be carried out by qualified personnel.
Specifications
Siemens QRA2 Series UV Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Product Family | QRA2 Series |
| Detector Classification | UV Flame Detector |
| Flame Detection Method | Ultraviolet radiation detection |
| UV Detection Wavelength | 190–270 nm |
| Applicable Fuels | Gas and oil |
| Permitted Operating Mode | Intermittent operation |
| Electrical Safety Classification | Class II |
| Ingress Protection | IP20; IP40 with suitable cable entries, such as AGG09 |
| Ambient Operating Temperature | -20 to +60 °C |
| Permissible Relative Humidity | Less than 95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
| Average UV Cell Service Life | Approximately 10,000 hours at temperatures up to 50 °C |
| Approximate Detector Weight | 46 g |
| Mounting Orientation | Optional |
| Recommended Electrical Cable | H05VV-F 2 × 0.75 mm² |
| Enclosure Material | Metallized plastic |
| Compatible Siemens Burner Controls | LGB2/LGB4 with AGQ1, LFL, LFE1, LFE10, LMG with AGQ2, LME21/LME22/LME39 with AGQ3, LME7, LMV2/LMV3 and LMV5 with AGQ1 |
Siemens QRA2 Model Variants and Accessories
| Detector Model | UV Sensitivity | Mounting Accessories | Terminal Cover Color |
|---|---|---|---|
| QRA2 | Normal | Without | Black |
| QRA2(1) | Normal | Rounded flange and clamp | Black |
| QRA2(2) | Normal | Straight flange and clamp | Black |
| QRA2.9 | Normal | Without | Black |
| QRA2M | High | Without | Green |
| QRA2M(1) | High | Rounded flange and clamp | Green |
| QRA2M(2) | High | Straight flange and clamp | Green |
Special Temperature Note: QRA2.9 has a heat-resistant housing capable of withstanding ambient temperatures up to 200 °C for only a few seconds. This does not represent its continuous operating temperature rating.
Product Specifications
Siemens QRA2 Series UV Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Product Family | QRA2 Series |
| Detector Classification | UV Flame Detector |
| Flame Detection Method | Ultraviolet radiation detection |
| UV Detection Wavelength | 190–270 nm |
| Applicable Fuels | Gas and oil |
| Permitted Operating Mode | Intermittent operation |
| Electrical Safety Classification | Class II |
| Ingress Protection | IP20; IP40 with suitable cable entries, such as AGG09 |
| Ambient Operating Temperature | -20 to +60 °C |
| Permissible Relative Humidity | Less than 95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
| Average UV Cell Service Life | Approximately 10,000 hours at temperatures up to 50 °C |
| Approximate Detector Weight | 46 g |
| Mounting Orientation | Optional |
| Recommended Electrical Cable | H05VV-F 2 × 0.75 mm² |
| Enclosure Material | Metallized plastic |
| Compatible Siemens Burner Controls | LGB2/LGB4 with AGQ1, LFL, LFE1, LFE10, LMG with AGQ2, LME21/LME22/LME39 with AGQ3, LME7, LMV2/LMV3 and LMV5 with AGQ1 |
Siemens QRA2 Model Variants and Accessories
| Detector Model | UV Sensitivity | Mounting Accessories | Terminal Cover Color |
|---|---|---|---|
| QRA2 | Normal | Without | Black |
| QRA2(1) | Normal | Rounded flange and clamp | Black |
| QRA2(2) | Normal | Straight flange and clamp | Black |
| QRA2.9 | Normal | Without | Black |
| QRA2M | High | Without | Green |
| QRA2M(1) | High | Rounded flange and clamp | Green |
| QRA2M(2) | High | Straight flange and clamp | Green |
Special Temperature Note: QRA2.9 has a heat-resistant housing capable of withstanding ambient temperatures up to 200 °C for only a few seconds. This does not represent its continuous operating temperature rating.
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