Siemens QRI Series Infrared Flame Detectors
Product Description
Siemens QRI Series Infrared Flame Detectors for Industrial Burners
Siemens QRI Series infrared flame detectors are designed to supervise gas, oil and other flames that produce infrared radiation. Working with compatible Siemens LMV5 burner control systems, they provide flame monitoring for industrial combustion equipment.
Key Features
- Infrared-sensitive photoresistor with an approximate spectral response of 1–3 µm
- Built-in flame signal amplifier
- Frontal and lateral flame sensing configurations
- Designed for compatible Siemens LMV5 burner controllers
- Supports continuous and intermittent burner operation
- Analog flame signal output of DC 0–5 V
- Impact-resistant black plastic housing with a dust-tight lens
- IP54 enclosure protection
Infrared Flame Detection Principle
The QRI detector incorporates an infrared-sensitive photoresistor that responds to variations in infrared radiation emitted by combustion flames.
An integrated electronic circuit converts these changes into an electrical flame signal for the connected burner controller. Electronic filtering helps suppress steady background radiation and interference caused by mains-frequency harmonics.
Available Siemens QRI Models
- QRI2A2.B180B: Infrared flame detector with frontal illumination
- QRI2B2.B180B: Infrared flame detector with lateral illumination
- QRI2B2.B180B1: Lateral illumination detector supplied with a straight flange and mounting clamp
Industrial Applications
Siemens QRI infrared flame detectors are suitable for gas and oil burner flame supervision in industrial boilers, industrial heating systems and other combustion installations using compatible Siemens LMV5 controls.
The detector must be installed and operated according to Siemens technical and safety instructions, including verification of the selected burner control version.
Installation and Safety Considerations
Position the detector behind the burner's baffle plate to reduce interference from hot surfaces and unrelated infrared radiation sources. Installation, wiring, commissioning and safety testing must be performed by qualified personnel.
Specifications
Siemens QRI Series Infrared Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Product Family | QRI Series |
| Detector Classification | Infrared Flame Detector |
| Sensing Technology | Infrared-sensitive Photoresistor |
| Spectral Sensitivity Band | Approx. 1–3 µm |
| Operating Supply Voltage | DC 14 V ±5% |
| Test Voltage | DC 21 V ±5% |
| Analog Flame Signal Voltage | DC 0–5 V |
| Power Consumption | < 0.5 W |
| Ingress Protection | IP54 |
| Electrical Safety Class | Class II |
| Integrated Connection Cable Length | 1.8 m |
| Maximum Cable Extension | 100 m |
| Ambient Operating Temperature | -20 to +60°C |
| Short-duration Temperature Limit | Up to +75°C (maximum 1 minute) |
| Relative Humidity | < 95% RH |
| Maximum Installation Altitude | 2,000 m above sea level |
| Vibration Resistance | Max. 1 g / 10–500 Hz |
| Approximate Weight with 1.8 m Cable | 0.175 kg |
| Mounting Orientation | Optional |
| Compatible Burner Controllers | Siemens LMV5 Series |
Siemens QRI Detector Model Comparison
| Detector Model | Flame Viewing Direction | Cable Length | Included Accessories |
|---|---|---|---|
| QRI2A2.B180B | Frontal | 180 cm | None included |
| QRI2B2.B180B | Lateral | 180 cm | None included |
| QRI2B2.B180B1 | Lateral | 180 cm | Straight flange and clamp |
Technical Note: Confirm the complete detector model, LMV5 compatibility, flame viewing direction, cable requirements and applicable Siemens installation instructions before ordering or commissioning.
Product Specifications
Siemens QRI Series Infrared Flame Detector Technical Specifications
| Manufacturer | Siemens |
|---|---|
| Product Family | QRI Series |
| Detector Classification | Infrared Flame Detector |
| Sensing Technology | Infrared-sensitive Photoresistor |
| Spectral Sensitivity Band | Approx. 1–3 µm |
| Operating Supply Voltage | DC 14 V ±5% |
| Test Voltage | DC 21 V ±5% |
| Analog Flame Signal Voltage | DC 0–5 V |
| Power Consumption | < 0.5 W |
| Ingress Protection | IP54 |
| Electrical Safety Class | Class II |
| Integrated Connection Cable Length | 1.8 m |
| Maximum Cable Extension | 100 m |
| Ambient Operating Temperature | -20 to +60°C |
| Short-duration Temperature Limit | Up to +75°C (maximum 1 minute) |
| Relative Humidity | < 95% RH |
| Maximum Installation Altitude | 2,000 m above sea level |
| Vibration Resistance | Max. 1 g / 10–500 Hz |
| Approximate Weight with 1.8 m Cable | 0.175 kg |
| Mounting Orientation | Optional |
| Compatible Burner Controllers | Siemens LMV5 Series |
Siemens QRI Detector Model Comparison
| Detector Model | Flame Viewing Direction | Cable Length | Included Accessories |
|---|---|---|---|
| QRI2A2.B180B | Frontal | 180 cm | None included |
| QRI2B2.B180B | Lateral | 180 cm | None included |
| QRI2B2.B180B1 | Lateral | 180 cm | Straight flange and clamp |
Technical Note: Confirm the complete detector model, LMV5 compatibility, flame viewing direction, cable requirements and applicable Siemens installation instructions before ordering or commissioning.
Company Information
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