LME75.811A2PKG Siemens Flame Safeguard

Overview

The Siemens LME75.811A2PKG is a high-performance, microprocessor-based flame safeguard package designed for the supervision of forced draft burners of medium to large capacity. Engineered for continuous operation (uninterrupted for more than 24 hours), this unit provides critical safety functions, including burner commissioning and monitoring of 1-stage or modulating gas and oil burners. The package is a comprehensive solution that includes the LME75.000A2 base unit, a PME75.811A2 program module, and a full connector plug kit, facilitating a simplified installation process for original equipment manufacturers and industrial combustion plants.

Features

• Self-checking mechanism supports continuous operation with compatible UV and infrared flame detectors
• Integrated valve proving function ensures safety by checking for leaks in gas valves
• Flexible actuator control supports 3-position step controllers or analog signals (DC 0 to 10 V, 4 to 20 mA)
• Safety-related digital inputs and outputs are monitored by a dedicated contact feedback network
• Digital signal handling provides high accuracy for control sequences and timing
• Multicolor LED and optional AZL2 display unit provide clear fault and operational status messages
• SIL3 classification according to DIN EN 13611, making it suitable for high-integrity industrial safety applications
• Parameterizable flame failure response time to meet specific regulatory standards like EN 676 or EN 746-2

Specifications

• Model: LME75.811A2PKG
• Voltage: AC 230 V (50/60 Hz)
• Base Unit: LME75.000A2
• Program Module: PME75.811A2
• Operating Mode: Continuous
• Protection Class: IP40 (when built-in)
• Safety Level: SIL 3 Capable
• Weight: Approximately 5.0 lbs (2.27 kg)
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Standards: CE Approved, DIN EN 298 compliance

Applications

• Supervision of 1-stage or modulating forced draft burners for gaseous or liquid fuels
• Industrial thermoprocessing equipment in accordance with EN 746-2
• Continuous operation burner systems in large-scale HVAC and boiler plants
• Use with self-checking UV scanners (such as QRA7), infrared scanners (QRI), or ionization probes
• Direct or pilot-ignited burner systems requiring integrated valve proving and actuator modulation