LME73.811A2PKG Siemens Flame Safeguard

Overview

The Siemens LME73.811A2PKG is a comprehensive flame safeguard assembly designed for the startup and supervision of multistage or modulating forced draft burners and atmospheric burners of medium to large capacity. This package includes the LME73.000A2 basic unit, a PME73.811A2 program module, and a complete plug kit. As a microprocessor-based system, it provides high-precision control for industrial and commercial combustion plants, ensuring safety through electronic self-supervision and digital signal handling. It is specifically engineered to drive and prove actuator positions during purge and ignition sequences, making it ideal for linkageless fuel-air ratio control applications.

Features

• Electronic self-supervision for high-demand safety requirements
• Digital signal handling for accurate and repeatable control sequences
• Integrated actuator control for driving and proving positions during purge and ignition
• Multicolor LED indication for operation status and detailed fault diagnostics
• Air pressure supervision with a functional check of the air pressure switch during start and operation
• Undervoltage detection and electrical remote lockout reset facility
• Interface for connection to external display units (AZL2) or PC communication tools
• Modular design with a removable program module for application flexibility

Specifications

• Model: LME73.811A2PKG
• Supply Voltage: AC 220 V to 240 V (50/60 Hz)
• Package Components: LME73.000A2 basic unit, PME73.811A2 program module, and plug set
• Operation Mode: Intermittent (at least one controlled shutdown every 24 hours)
• Designed Lifetime: 250,000 burner startup cycles (approximately 10 years of service)
• Protection Rating: IP40 (when mounted appropriately)
• Flame Detection: Compatible with ionization probes and QRA series UV detectors
• Actuator Compatibility: Designed to pair with SQM4 or SQM5 actuators via 3-position control

Applications

• Supervision of multistage or modulating forced draft oil and gas burners
• Ideal for packaged burners and systems using pneumatic or mechanical fuel-air ratio regulators
• Industrial and commercial boilers and thermal process plants
• Ignition spark proving and pilot/main flame supervision
• Systems requiring linkageless control where the flame safeguard drives the air/gas damper actuator
• Modernization and replacement of legacy burner control systems in HVAC environments