UV Flame Detection
Uses an ultraviolet-sensitive detector cell that responds to radiation in the 190 nm to 270 nm spectral range for flame supervision.
SIEMENS
SIEMENS QRA4.U Flame Detector UV Sensor
$59.72
Available
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SIEMENS
SIEMENS QRA4.U Flame Detector UV Sensor
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$59.72
Available to order
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PRODUCT DOCUMENTATION
Product Information
Technical specifications, features, applications and purchasing information.
Technical Specifications
| Brand | SIEMENS |
| Model Number | QRA4.U |
| Product Category | Flame Detector UV Sensor |
| Detection Technology | Ultraviolet (UV) flame detection |
| Spectral Range | 190 nm to 270 nm |
| Sensitivity | Normal |
| Housing Material | Aluminum |
| Mounting Thread | 3/4-14 NPSM |
| Cable Length | Approximately 1.8 m |
| Permissible Combustion Chamber Pressure | Maximum 150 mbar |
| Degree of Protection | IP54 (when installed) |
| Operating Temperature | -20°C to +60°C |
| Storage/Transport Temperature | -20°C to +60°C |
| Relative Humidity (Operation) | <95% r.h. |
| UV Cell Average Life | ~10,000 hours at max. +50°C |
| Weight (approx.) | 180 g |
| Protection Class | II (protective insulation) |
Key Features
Gas and Oil Flame Monitoring
Designed for monitoring gas flames, yellow/blue oil flames, and ignition spark supervision in intermittent operation with compatible burner controls.
Aluminum Housing with NPSM Thread
The aluminum housing features a 3/4-14 NPSM thread for mounting to a burner or boiler, with a connection cable approximately 1.8 m long.
150 mbar Combustion Chamber Rating
Permitted combustion chamber pressure is up to 150 mbar, supporting use in pressurized combustion systems within the specified limit.
IP54 Protection
The IP54 degree of protection is ensured by the installation, supporting use in environments where dust and water spray exposure are limited.
Applications
- Gas flame supervision in industrial and commercial burner systems
- Oil flame monitoring for yellow/blue burning liquid fuels
- Ignition spark supervision in intermittent burner operation
- Combustion safety systems using compatible Siemens burner controls
- Boiler and furnace flame detection applications
- Burner management systems requiring UV flame sensing
Purchase Information
We support online purchase of the SIEMENS QRA4.U Flame Detector UV Sensor. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is the SIEMENS QRA4.U? The QRA4.U is a UV flame detector from Siemens designed for flame supervision in gas and oil burner systems with compatible burner controls.
What detection technology does it use? It uses an ultraviolet (UV) detector cell that responds to radiation in the 190 nm to 270 nm spectral range.
What flames can it monitor? It is suitable for monitoring gas flames, yellow/blue oil flames, and ignition sparks in intermittent operation, depending on the burner control used.
What is the permissible combustion chamber pressure? The maximum permissible combustion chamber pressure is 150 mbar.
What is the degree of protection? The QRA4.U has an IP54 degree of protection when installed.
What is the operating temperature range? The operating temperature range is -20°C to +60°C, with storage and transport tolerance over the same range.
What is the UV cell life? The average UV cell life is approximately 10,000 hours at a maximum ambient temperature of +50°C; higher temperatures reduce the life.
What mounting thread does it have? The aluminum housing has a 3/4-14 NPSM thread for mounting to a burner or boiler.
What is the cable length? The electrical connection cable is approximately 1.8 m long.
What should be checked before ordering? Verify the QRA4.U model number, the burner control compatibility (such as LFL, LFE, LGB, LME, or LMV series with appropriate UV accessories), the combustion chamber pressure, and the installation location requirements.
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Send us your part number and technical requirements.
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