LME71.111A1-PRG27 Siemens Flame Safeguard

Overview

The Siemens LME71.111A1-PRG27 is a high-performance, microprocessor-based flame safeguard designed for the startup and supervision of 1-stage, forced draft gas or oil burners in intermittent operation. This specific model is a preprogrammed version of the LME71.111A1PKG, providing a convenient, ready-to-use solution for industrial burner control. It integrates a basic burner control unit with a specialized program module to manage critical safety functions, including programmable purge and flame supervision. By monitoring flames via UV scanners or ionization probes, it ensures the safe energization of safety shutoff valves, protecting industrial thermal process plants from hazardous conditions.

Features

• Comprehensive Flame Supervision: Supports multiple detector types including UV flame detectors (QRA series) and ionization probes for versatile application.
• Programmable Purge: Includes a programmable purge sequence to ensure the combustion chamber is clear of residual fuel before ignition.
• Proof of Closure (POC) Input: Features a dedicated input to monitor that the gas valve is fully closed, enhancing system safety.
• Multi-color Status Indication: Integrated 3-color LED and a 3 x 7-segment display provide clear visual feedback on operating states, program sequences, and fault codes.
• Electrical Remote Reset: Facilitates ease of operation with the ability to reset the unit remotely following a lockout.
• Accurate Digital Signal Handling: Ensures precise control sequences and high repeatability for industrial combustion processes.
• Modular Design: Utilizes the PME71.111A1 program module, allowing for specific parameter adjustments and easy replacement of the core programming logic.

Specifications

• Model: LME71.111A1-PRG27 (Preprogrammed LME71.111A1PKG)
• Mains Voltage: 120 V AC (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Safety Class: I
• Degree of Protection: IP40 (when mounted correctly)
• Response Time: Factory set at 3 seconds for loss of flame (adjustable to 1 second via parameters)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 1.2 lbs (0.54 kg)
• Approvals: UL listed, FM approved, and CSA certified

Applications

• Industrial Burner Control: Ideally suited for medium to high-capacity forced draft burners used in industrial thermal process plants.
• Commercial HVAC Systems: Used in large-scale boiler systems for reliable startup and flame supervision.
• 1-Stage Gas and Oil Burners: Specifically designed for direct or pilot-ignited forced draft burners.
• Atmospheric Burners: Suitable for supervising atmospheric gas burners in intermittent operation.
• OEM Integration: Designed for original equipment manufacturers to integrate into custom burner management panels and gas trains.