The Siemens LFS1.1 Flame Sensor & Detector is a high-reliability flame safeguard designed for oil-fired industrial burners used in boilers, furnaces, and process heating equipment. It provides continuous monitoring of burner flame conditions and ensures safe burner operation by detecting the presence or absence of flame during burner operation.

The LFS1.1 uses a RAR9 photocell flame detector, specifically designed for monitoring yellow oil flames in industrial combustion systems. This detector continuously supervises the flame signal and sends feedback to the burner control system, allowing immediate shutdown in case of flame failure.

Designed for industrial safety applications, the LFS1 series flame safeguard units can be integrated with Siemens burner control systems such as LEC1, LME39, or programmable logic controllers (PLC). This makes it suitable for OEM burner manufacturers and combustion control systems used in large industrial installations.

The compact and robust design allows reliable operation in demanding industrial environments, and the system supports advanced diagnostics including flame signal monitoring through a 0–10 V analog output signal.

Key Features

• Designed for oil-fired industrial burners

• Reliable flame monitoring using RAR9 photocell detector

• Compact and robust industrial design

• Suitable for continuous burner operation

• Compatible with Siemens burner control systems

• Integrated flame signal output (0–10 V)

• Multicolor LED indication for flame signal

• Parameterization via BCI communication interface

• Potential-free signal contacts with double insulation

• Built-in undervoltage detection and safety monitoring

Applications

• Industrial oil burners

• Steam boiler burner systems

• Thermal oil heaters

• Industrial furnaces and ovens

• Process heating equipment

• Combustion systems requiring continuous flame supervision

Why Choose Siemens LFS1.1 Flame Sensor & Detector?

• Reliable Siemens flame monitoring technology

• Ensures safe burner operation and flame failure protection

• Designed for continuous industrial operation

• Compatible with Siemens burner control systems

• Compact design for easy installation

• Suitable for high-safety industrial combustion applications

Technical Description

The Siemens LFS1.1 Flame Sensor & Detector is a flame safeguard unit designed for the supervision of oil flames in industrial combustion systems. It operates using a RAR9 photocell flame detector, which is optimized for detecting yellow oil burner flames in continuous operation.

The flame safeguard unit monitors burner flame conditions and transmits a flame signal to the burner control system. If flame loss occurs, the system initiates a shutdown sequence to maintain safe burner operation.

The LFS1.1 is typically used in combination with Siemens burner controls such as LEC1, LME series controllers, or programmable logic controllers, enabling integration into modern industrial combustion management systems.

The system also provides analog flame signal output (0–10 V) and LED status indicators for diagnostics and monitoring during burner operation.

Technical Specifications