Siemens QRA2 Flame Detector
Technical specs, application notes, replacement checks, and related model references.
Product Overview
The Siemens QRA2 is a highly sensitive UV (ultraviolet) flame detector designed for the reliable supervision of gas, oil, or dual-fuel flames. It utilizes a specialized UV-sensitive cell that reacts exclusively to the ultraviolet radiation emitted by combustion flames, remaining immune to the glowing refractory brickwork of the combustion chamber. Crucial for industrial boilers, process furnaces, and multi-burner installations, the QRA2 provides instantaneous flame status feedback to the burner control unit to prevent unburned fuel accumulation. The QRA series is renowned for its rapid response time, high sensitivity, and rugged die-cast aluminum housing, ensuring dependable flame monitoring in extreme industrial environments.
Key Features
- Component Type: Flame Detectors
- Operating Voltage: AC 220V / 230V
- Protection Class: IP40 / IP54
- Original Siemens quality and reliability
- Compliant with relevant CE / DIN EN standards
Technical Specifications
Verification RequiredProtection Class
IP20
Selection Notes & Data Verification
The QRA2 page is structured for engineering comparison: confirm the product type, firing range, fuel type, operating mode, electrical supply, and safety approvals against the manufacturer datasheet before specifying the burner or component.
Burner.wiki normalizes product data for discovery and comparison, but final selection should account for combustion chamber backpressure, local emission limits, control sequence requirements, and site commissioning conditions.
Typical Applications
Related Models
View QRA seriesRelated Knowledge
FAQ
What is Siemens QRA2 used for?
Siemens QRA2 is referenced as a flame detector for industrial combustion systems. Verify the exact application against the burner documentation, control cabinet wiring, and manufacturer datasheet.
Can QRA2 replace another model?
Replacement depends on voltage, safety timing, wiring terminals, flame supervision method, mechanical fit, and local combustion safety requirements.
What should be checked before installing QRA2?
Check supply voltage, burner sequence, fuel type, pressure or capacity range, detector compatibility, safety loop configuration, and the equipment nameplate before commissioning.
Documentation Note
Technical documentation should be verified against the manufacturer datasheet, burner cabinet wiring diagram, and equipment nameplate before installation or replacement.
- Check supply voltage and frequency.
- Confirm terminal layout and safety interlocks.
- Verify flame detector or actuator compatibility.
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