LFS1.11A2 Siemens Flame Detector Relay

Overview

The Siemens LFS1.11A2 is a digital flame detector relay designed for the supervision of oil flames in industrial and commercial burner applications. Engineered for continuous operation, this compact device acts as a flame safeguard by signaling the presence of a flame to a programmable logic controller (PLC) or other burner control units like the Siemens LEC1. It serves as a modern, high-performance replacement for legacy models such as the LAE10, offering enhanced safety features and a small footprint to save panel space.

Features

• Designed for continuous operation mode with a high safety integrity level up to SIL3
• Compatible with Siemens RAR9 photocell detectors for precise oil flame supervision
• Potential-free signal contacts with double insulation for increased safety and reliability
• Integrated 0 to 10 V DC analog output for monitoring and displaying flame signal strength
• Multicolor LED signal lamp provides immediate visual feedback on the flame status
• BCI communication interface allows for flexible parameterization and data access via units like the AZL2
• Robust and compact plug-in design simplifies installation and maintenance in industrial environments

Specifications

• Model: LFS1.11A2
• Mains Voltage: AC 230 V (-15% to +10%)
• Mains Frequency: 50/60 Hz (+/- 6%)
• Power Consumption: Approximately 4.5 VA
• Safety Rating: SIL3 capable (with RAR9 detector)
• Operating Life: Up to 1,000,000 burner startup cycles at reduced loads
• Degree of Protection: IP40 (when installed with appropriate cable entry)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.45 kg (1.0 lb)

Applications

• Supervision of oil flames in industrial burners and combustion plants
• Used in maritime applications as a certified ship burner flame safeguard
• Ideal for multi-flame supervision systems where several burners are monitored individually but controlled centrally
• Suitable for plants with manual startup as a flame indication unit
• Integration with fail-safe PLCs or burner controls such as the Siemens LMV52 or LEC1 series