Product Overview
The Siemens QRA2(1) is an ultraviolet flame detector designed for supervision of gas flames and yellow- or blue-burning oil flames. It can also be used for ignition-spark proving with compatible Siemens burner controls.
This compact detector is commonly installed on marine boilers, incinerators, thermal-oil heaters and industrial burners operating in intermittent mode.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Siemens |
| Model | QRA2(1) |
| Full ordering number | BPZ:QRA2(1) |
| Detection principle | Ultraviolet radiation |
| Spectral response | Approximately 190–270 nm |
| Sensitivity | Normal |
| Terminal-cover colour | Black |
| Housing | Metallized plastic |
| Mounting | Direct burner mounting |
| Mounting accessories | Flange and retaining clamp included |
| Enclosure protection | IP40 |
| Operating mode | Intermittent |
| Permissible mounting position | Any position |
| UV-cell service life | Approximately 10,000 hours at maximum 50°C |
| Flame-detector cable | Two-core cable; ordered/installed separately |
| Monitored flames | Gas, yellow-burning oil and blue-burning oil |
Compatible Siemens Burner Controls
Depending on the complete burner-control arrangement and required ancillary unit, QRA2 detectors may be used with:
- Siemens LFL series
- LFE1 and LFE10
- LGB2 and LGB4 with AGQ1
- LMG with AGQ2
- LME21, LME22 and LME39 with AGQ3
- LMV2 and LMV3
- LMV5 with the specified ancillary unit
- LFS1 flame-safeguard systems
Compatibility must be verified against the installed burner controller and wiring arrangement.
Main Features
- Detects ultraviolet radiation from gas and oil flames
- Does not normally respond to daylight or glowing refractory material
- Compact direct-burner mounting arrangement
- Supplied with mounting flange and clamp
- Normal-sensitivity version for common burner applications
- Replaceable UV detector tube
- Suitable for ignition-spark proving
- Designed for established Siemens burner-management systems
Marine and Industrial Applications
- Marine auxiliary boilers
- Composite and exhaust-gas boilers with burners
- Thermal-oil heaters
- Shipboard incinerators
- Cargo-heating boilers
- Industrial steam boilers
- Furnaces and process heaters
- Gas- and oil-fired burner systems
