LME71.402A2PKG Siemens Flame Safeguard

Overview

The Siemens LME71.402A2PKG is a comprehensive, microprocessor-based flame safeguard assembly designed for the startup and supervision of 1- or 2-stage forced draft gas or oil burners. This preassembled kit includes the LME71.000A2 basic unit, the PME71.402A2 program module, and a complete plug connector set. It provides critical safety functions by energizing safety shutoff valves while continuously monitoring the flame to prevent hazardous operating conditions. The LME71 series is engineered for medium to high-capacity industrial thermal process applications and offers enhanced diagnostic capabilities via a multi-color LED signal lamp and an optional remote display.

Features

• Digital signal handling ensures accurate control sequences and high repeatability
• Integrated Proof of Closure (POC) input for monitoring gas valve seat seals
• Programmable purge timing to suit specific application safety requirements
• Multi-color LED indicator provides clear status and error messages (e.g., yellow for ignition, green for flame detection)
• Supports flame supervision via ionization probe or UV detectors (such as QRA2, QRA4, or QRA10)
• Electrical remote lockout reset facility for convenient system management
• Undervoltage detection and air pressure supervision with functional checks during start and operation
• BC interface allows for connection to an AZL2 display unit or a PC for advanced diagnostics and parameterization

Specifications

• Model: LME71.402A2PKG
• Supply Voltage: AC 230 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (when mounted correctly)
• Safety Time (TSA): 3 seconds (typical, based on PME71.402A2)
• Flame Failure Response Time (FFRT): 1 second
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 5.0 lbs (2.27 kg)
• Dimensions: 12 x 8 x 8 inches (packaged kit)

Applications

• Supervision of 1-stage or 2-stage forced draft gas or oil burners
• Industrial thermal process plants and large-capacity commercial boiler systems
• Atmospheric burners requiring precise control of program sequences
• Linkageless or basic burner management configurations in HVAC environments
• Systems requiring Proof of Closure (POC) monitoring for enhanced combustion safety