LME73.000A2 Siemens Flame Safeguard

Overview

The Siemens LME73.000A2 is a high-performance, microprocessor-based burner control unit designed for the startup and supervision of multistage or modulating forced draft gas or oil burners. Engineered for intermittent operation, this basic unit serves as a critical safety component in medium to large capacity industrial and commercial combustion systems. It features an integrated actuator control and a BCI interface for seamless connection to external displays or PC tools, ensuring precise fuel-air ratio control and reliable flame monitoring.

Features

• Integrated actuator control for precise management of air dampers or fuel-air ratios
• Digital signal processing for highly accurate control sequences and program timing
• Multicolor LED signal lamp and 3 x 7-segment display for clear status and error messaging
• BC interface enables connection to AZL2 display units or PC-based service tools
• Comprehensive safety monitoring including air pressure supervision and undervoltage detection
• Electrical remote lockout reset facility for convenient system management
• Slot for interchangeable PME7 program modules to customize application-specific sequences
• Robust protection rating of IP40 suitable for varied industrial environments

Specifications

• Model: LME73.000A2
• Supply Voltage: AC 230 V (50/60 Hz)
• Operation Type: Intermittent (at least one controlled shutdown every 24 hours)
• Power Consumption: Approximately 0.75 kg (Weight)
• Temperature Range: -20 C to +60 C
• Program Modules: Requires PME73.xxxA2 series
• Flame Detection: Ionization probe, UV detectors (QRA2, QRA4, QRA10), or photo-resistive sensors (QRB, QRC)
• Dimensions: Approximately 180mm x 120mm x 52.6mm
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years)

Applications

• Supervision of multistage or modulating forced draft gas and oil burners
• Control of atmospheric gas burners in commercial and industrial heating systems
• Integration into burner systems requiring linkageless or mechanical fuel-air ratio control
• Use in thermal process plants according to EN 746-2 standards
• Ideal for OEMs building complex gas trains and high-capacity burner assemblies