Siemens Photocell Flame Detector QRA10 QRA5x QRA7x Series
Product Description
Siemens QRA10, QRA5x and QRA7x UV Flame Detectors
Siemens QRA10 / QRA5x / QRA7x Series flame detectors use ultraviolet sensing technology to monitor gas and oil burner flames in industrial combustion installations. When connected to compatible Siemens burner control units, they provide flame detection signals required for combustion supervision and burner safety functions.
These detectors respond to ultraviolet radiation in the 190–270 nm wavelength band. They can detect gas flames, yellow- or blue-burning oil flames and ignition sparks. Typical installations include industrial steam boilers, furnaces and process heating equipment.
Key Features
- UV-based flame sensing for industrial combustion equipment
- Suitable for detecting gas and oil burner flames
- Intermittent or continuous flame monitoring according to detector series
- Designed for specified Siemens burner management systems
- QRA10 incorporates a die-cast aluminum enclosure and cooling-air connection
- QRA5x and QRA7x incorporate motor-driven shutters and quartz-glass protection
- Optional installation accessories for different mounting conditions
Overview of the QRA Detector Families
Siemens QRA10 Series
QRA10 detectors are intended for intermittent burner flame supervision. They feature a die-cast aluminum housing, bayonet-style mounting and a cooling-air connection. Available accessories support installation, viewing-angle adjustment and protection against heat.
Siemens QRA5x Series
The QRA5x family comprises QRA53 and QRA55 flame detectors for continuous operation with compatible Siemens LGK16 and LGI16 burner controls. These models use motor-operated shutters and offer normal- and high-sensitivity configurations.
Siemens QRA7x Series
The QRA7x family includes QRA73 and QRA75 UV detectors for continuous flame monitoring with compatible Siemens LMV5 and LME75 controllers. They feature motor-driven shutters and integrated electronics for shutter control.
Industrial Applications
- Industrial steam and hot water boilers
- Gas-fired burner systems
- Oil-fired burner systems
- Industrial furnaces
- Industrial process heating installations
Detector Selection Guidelines
Choose the detector according to the exact burner control model, required operating mode, electrical supply, UV sensitivity and mechanical mounting conditions. Check the full detector designation and relevant Siemens technical documentation before specifying equipment.
Safety Information: Installation, electrical connections and maintenance must be performed by qualified personnel. Disconnect and isolate the electrical supply before working on the detector or associated burner equipment.
Specifications
Siemens QRA10 / QRA5x / QRA7x UV Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Detector Type | UV Flame Detector |
| Product Families | QRA10 / QRA5x / QRA7x |
| Flame Sensing Principle | Ultraviolet radiation |
| Detection Wavelength Band | 190–270 nm |
| Supported Flame Types | Gas, yellow-burning oil and blue-burning oil flames |
| Typical UV Cell Service Life | Approximately 10,000 hours at max. 50°C |
| Ambient Operating Temperature | -20 to +60°C |
| Permissible Relative Humidity | Less than 95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
| Electrical Safety Classification | Class I |
| Mounting Orientation | Optional |
Comparison of Siemens QRA Detector Series
| Technical Parameter | QRA10 | QRA5x | QRA7x |
|---|---|---|---|
| Detector Models | QRA10.C / QRA10M.C | QRA53 / QRA55 | QRA73 / QRA75 |
| Operating Duty | Intermittent | Continuous | Continuous |
| Supported Burner Controllers | LGB, LFL, LFE, LMG, LME and LMV (model-dependent) | LGK16 / LGI16 | LMV5 / LME75 |
| Enclosure Protection | IP54 / IP65 with AGG08 | IP65 | IP65 |
| Approximate Device Weight | 740 g | 700 g | 700 g |
| Electrical Connection Cable | Recommended H05VV-F 3 x 0.75 | AGM19 | AGM23 / AGM23U |
QRA Model Configurations and Operating Voltage
| Detector Model | UV Sensitivity | Detector Tube Length | Supply Voltage |
|---|---|---|---|
| QRA10.C | Normal | - | Burner control-dependent |
| QRA10M.C | High | - | Burner control-dependent |
| QRA53.E17 / QRA53.G17 | Normal / High | 125 mm | AC 100–110 V |
| QRA53.E27 / QRA53.G27 | Normal / High | 125 mm | AC 220–240 V |
| QRA55.E17 / QRA55.G17 | Normal / High | 69 mm | AC 100–110 V |
| QRA55.E27 / QRA55.G27 | Normal / High | 69 mm | AC 220–240 V |
| QRA73.A17 / QRA75.A17 | Normal | 125 / 69 mm | AC 120 V |
| QRA73.A27 / QRA75.A27 | Normal | 125 / 69 mm | AC 230 V |
Compatible Mounting and Connection Accessories
- AGG02 – Thermal insulation glass
- AGG03 – Quartz-glass optical lens
- AGG06 – Holder for glass and quartz-glass lenses
- AGG07 – Adjustable ball-head mounting component for viewing-angle adjustment
- AGG08 – IP65 sealing and protection kit for QRA10
- AGG16.C – Mounting adapter for QRA5x / QRA7x detectors
- AGM19 – Connection cable for QRA53 / QRA55
- AGM23 / AGM23U – Connection cables for QRA7x detectors
Technical Reference: Information is based on Siemens Data Sheet CC1N7712en, issued 24 August 2021. Verify the required detector version, compatibility with the burner controller and installation instructions before ordering or commissioning.
Product Specifications
Siemens QRA10 / QRA5x / QRA7x UV Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Detector Type | UV Flame Detector |
| Product Families | QRA10 / QRA5x / QRA7x |
| Flame Sensing Principle | Ultraviolet radiation |
| Detection Wavelength Band | 190–270 nm |
| Supported Flame Types | Gas, yellow-burning oil and blue-burning oil flames |
| Typical UV Cell Service Life | Approximately 10,000 hours at max. 50°C |
| Ambient Operating Temperature | -20 to +60°C |
| Permissible Relative Humidity | Less than 95% RH |
| Maximum Installation Elevation | 2,000 m above sea level |
| Electrical Safety Classification | Class I |
| Mounting Orientation | Optional |
Comparison of Siemens QRA Detector Series
| Technical Parameter | QRA10 | QRA5x | QRA7x |
|---|---|---|---|
| Detector Models | QRA10.C / QRA10M.C | QRA53 / QRA55 | QRA73 / QRA75 |
| Operating Duty | Intermittent | Continuous | Continuous |
| Supported Burner Controllers | LGB, LFL, LFE, LMG, LME and LMV (model-dependent) | LGK16 / LGI16 | LMV5 / LME75 |
| Enclosure Protection | IP54 / IP65 with AGG08 | IP65 | IP65 |
| Approximate Device Weight | 740 g | 700 g | 700 g |
| Electrical Connection Cable | Recommended H05VV-F 3 x 0.75 | AGM19 | AGM23 / AGM23U |
QRA Model Configurations and Operating Voltage
| Detector Model | UV Sensitivity | Detector Tube Length | Supply Voltage |
|---|---|---|---|
| QRA10.C | Normal | - | Burner control-dependent |
| QRA10M.C | High | - | Burner control-dependent |
| QRA53.E17 / QRA53.G17 | Normal / High | 125 mm | AC 100–110 V |
| QRA53.E27 / QRA53.G27 | Normal / High | 125 mm | AC 220–240 V |
| QRA55.E17 / QRA55.G17 | Normal / High | 69 mm | AC 100–110 V |
| QRA55.E27 / QRA55.G27 | Normal / High | 69 mm | AC 220–240 V |
| QRA73.A17 / QRA75.A17 | Normal | 125 / 69 mm | AC 120 V |
| QRA73.A27 / QRA75.A27 | Normal | 125 / 69 mm | AC 230 V |
Compatible Mounting and Connection Accessories
- AGG02 – Thermal insulation glass
- AGG03 – Quartz-glass optical lens
- AGG06 – Holder for glass and quartz-glass lenses
- AGG07 – Adjustable ball-head mounting component for viewing-angle adjustment
- AGG08 – IP65 sealing and protection kit for QRA10
- AGG16.C – Mounting adapter for QRA5x / QRA7x detectors
- AGM19 – Connection cable for QRA53 / QRA55
- AGM23 / AGM23U – Connection cables for QRA7x detectors
Technical Reference: Information is based on Siemens Data Sheet CC1N7712en, issued 24 August 2021. Verify the required detector version, compatibility with the burner controller and installation instructions before ordering or commissioning.
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