LME71.401A1PKG Siemens Flame Safeguard

Overview

The Siemens LME71.401A1PKG is a comprehensive, microprocessor-based flame safeguard package designed for the startup and supervision of 1- or 2-stage gas forced draft burners in intermittent operation. This all-in-one kit includes the LME71.000A1 burner control base unit, the PME71.401A1 program module, and a complete AGG3.710 connector plug set. Engineered for industrial thermal process applications, it ensures safety by managing the sequence of operation for fuel-air ratios and monitoring flames to prevent hazardous conditions. The unit features digital signal handling for accurate control sequences and includes specialized inputs for flame supervision via ionization probes or UV flame detectors.

Features

• Packaged assembly containing the base unit, programming chip, and all necessary terminal plugs for immediate installation
• Integrated multicolor LED signal lamp provides clear status and error messages regarding the program sequence
• Supports multiple flame detection methods including ionization probes and QRA series UV flame detectors
• Proof of Closure (POC) input allows for monitoring safety shut-off valves to ensure they are 100% closed before startup
• Electrical remote lockout reset facility for convenient system management from a distance
• Air pressure supervision with a functional check of the air pressure switch during both startup and operation
• Undervoltage detection mechanism that triggers safety protocols if power levels drop below acceptable limits
• BC interface allows for connection to an AZL2 display unit or a PC for advanced parameter adjustment and diagnostics

Specifications

• Model Number: LME71.401A1PKG
• Operating Voltage: AC 120 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Safety Standards: UL listed, FM approved, and CSA certified
• Operating Mode: Intermittent (at least one controlled shutdown every 24 hours)
• Protection Rating: IP40 (when properly mounted)
• Operating Temperature: -20 C to +60 C
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years under normal conditions)
• Dimensions: Approximately 12 x 8 x 8 inches (packaged)
• Weight: Approximately 1.2 lbs to 5 lbs (including packaging)

Applications

• Supervision of 1- or 2-stage gas forced draft burners in medium to high-capacity systems
• Control of atmospheric gas burners in industrial and commercial heating plants
• Industrial thermal process applications requiring precise sequence control and linkageless ratio management
• Suitable for systems utilizing manual or automatic reset high/low pressure switches for gas and air monitoring
• Integration into burner management systems that require Modbus or remote display status monitoring via the AZL23 unit