LFE10 Siemens Flame DETECTION Relay

Overview

The Siemens LFE10 is a high-performance flame safeguard designed for the supervision of gas and luminous or blue-burning oil flames. Engineered for intermittent operation, this flame detector relay is a critical safety component used to monitor and indicate flame status in industrial and commercial burner systems. It is primarily used in conjunction with Siemens LEC1 burner controls or as a standalone flame indication unit in manually started plants. The LFE10 features an intrinsically safe electrical circuit and a plug-in design for easy installation and maintenance.

Features

• Self-checking mechanism with automatic flame simulation testing during burner off and purging times
• Versatile flame supervision supporting both UV detectors (QRA series) and ionization probes
• Integrated flame indication lamp located behind a viewing window for instant status monitoring
• Durable, impact-proof, and heat-resistant plastic housing with an IP40 protection rating
• Flexible mounting options allowing for installation in any position directly on the burner or in control panels
• Double-insulated design with dedicated earth terminals for looping auxiliary burner components

Specifications

• Model: LFE10
• Operating Voltage: AC 220 V to 240 V (+10% / -15%)
• Mains Frequency: 50 to 60 Hz (+/- 6%)
• Power Consumption: 4.5 VA
• Response Time: Less than 1 second
• Contact Rating: Max 2 A
• Protection Class: IP40 (with appropriate cable entry)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 395 g (without plug-in base)

Applications

• Dual-supervision of burners for monitoring main flames or pilot/main flame combinations
• Supervision of forced draft oil and gas burners using different detector types based on operating mode
• Multi-flame supervision in plants where several burners must be monitored individually but controlled centrally
• Flame indication in combustion plants with manual startup procedures
• Integration with Siemens LEC1 control units or programmable logic controllers (PLCs) in industrial heating and boiler systems