LME75.811A1PKG-PRG3 Siemens Flame Safeguard

Overview

The Siemens LME75.811A1PKG-PRG3 is a comprehensive burner control package designed for the commissioning and supervision of 1-stage or modulating forced draft burners. This microprocessor-based flame safeguard is specifically engineered for continuous operation, exceeding 24 hours of uninterrupted use. The “PKG” designation indicates a pre-assembled convenience kit that includes the LME75.000A1 base unit, the PME75.811A1 program module, and a complete AGG3.710 connector plug set. It is ideal for medium to large-capacity industrial and commercial burners, providing advanced safety functions such as integrated valve proving and linkageless fuel-air ratio control when paired with Siemens SQM actuators.

Features

• Designed for continuous operation (> 24 hours) for high-demand industrial applications
• Integrated valve proving (leakage test) function to ensure fuel train integrity
• Compatible with self-checking UV scanners (QRA7), infrared scanners (QRI), or ionization probes
• 3-color LED signal lamp and 3×7-segment display for clear operating status, service information, and fault diagnostics
• Programmable actuator modulation via PWM, analog (DC 0…10 V, 4…20 mA), or 3-position step control
• Digital signal handling ensures accurate control sequences and repeatable performance
• BC interface allows for direct connection of an AZL2 display unit or PC for parameterization
• Safety-critical design meeting SIL3 classification (DIN EN 13611) for high-level protection

Specifications

• Model: LME75.811A1PKG-PRG3
• Operating Voltage: AC 120 V (+10% / -15%)
• Mains Frequency: 50…60 Hz
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Safety Level: SIL3 Capable; designed for 250,000 startup cycles (approx. 10 years)
• Dimensions: 12 x 8 x 8 inches (packaged)
• Weight: Approximately 5 lbs

Applications

• Supervision of 1-stage or modulating forced draft burners for gaseous and liquid fuels
• Industrial thermoprocessing plants complying with EN 746-2 requirements
• Continuous operation burner systems such as steam boilers, thermal oil heaters, and industrial furnaces
• Linkageless burner systems requiring integrated valve proving and precise actuator control
• Replacement of legacy burner controls in existing medium to large-capacity combustion plants