LFS1.21A1 Siemens Flame Detector Relay
$655.80
The Siemens LFS1.21A1 is a compact flame detector relay designed for the supervision of oil and gas flames in industrial and commercial burner systems. Functioning as a flame safeguard or switch, it provides reliable flame presence signaling to programmable logic controllers (PLCs) or other burner control units. It serves as a modern replacement for the obsolete LFE10-110V series, offering a space-saving design and advanced diagnostic capabilities for high-demand burner environments.
Overview
The Siemens LFS1.21A1 is a compact flame detector relay designed for the supervision of oil and gas flames in industrial and commercial burner systems. Functioning as a flame safeguard or switch, it provides reliable flame presence signaling to programmable logic controllers (PLCs) or other burner control units. It serves as a modern replacement for the obsolete LFE10-110V series, offering a space-saving design and advanced diagnostic capabilities for high-demand burner environments.
Features
- Compact footprint designed to save premium panel space in multi-burner applications
- Integrated multicolor LED signal lamp for immediate visual status and flame signaling
- Analog 0-10V DC output to report flame signal strength to external monitoring systems
- Potential-free signal contacts with double insulation for increased safety and reliability
- Safety integrity level up to SIL3 for continuous operation with ionization probes
- Integrated BCI communication interface for parameterization and system diagnostics
- Built-in detection for undervoltage and overvoltage to ensure stable operation
Specifications
- Operating Voltage: AC 120 V (50/60 Hz)
- Compatible Detectors: Ionization probes, QRA series UV detectors, and RAR9 photocells
- Operating Mode: Continuous operation for ionization and intermittent for UV detectors
- Protection Rating: IP40
- Temperature Range: -20 C to +60 C
- Output Signal: 0-10 VDC flame strength signal (1 mA maximum)
- Contact Rating: 1 A maximum for relay output contacts
- Design Life: 250,000 burner startup cycles under normal operating conditions
Applications
- Supervision of oil or gas flames in industrial and commercial burner systems
- Integration with PLC-based combustion safeguards for sequence and safety control
- High-security applications requiring SIL2 or SIL3 safety ratings
- Multi-flame supervision in plants where several burners are monitored centrally
- Retrofitting existing burner installations as a replacement for LFE10-110V units
| Weight | 2 lbs |
|---|---|
| Dimensions | 7 × 5 × 4 in |
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