LME75.000A2 Siemens Flame Safeguard

Overview

The Siemens LME75.000A2 is a microprocessor-based burner control unit designed for the commissioning and supervision of forced draft burners of medium to high capacity. This advanced digital flame safeguard is engineered for continuous operation, making it suitable for industrial and commercial applications that require uninterrupted burner cycles. It functions as a basic unit that must be paired with a PME75 series program module to define the specific burner sequence and parameters. The LME75.000A2 ensures high safety and precision through digital signal processing, providing a modular and expandable solution for modern combustion systems.

Features

• Continuous Operation: Designed for burner cycles exceeding 24 hours without interruption
• Digital Signal Processing: Ensures accurate program timings and reliable control sequences
• Multicolor Diagnostics: Integrated LED signal light and 3 x 7-segment display for clear operational and fault status messaging
• Versatile Flame Monitoring: Compatible with ionization probes, QRA7 UV sensors, and QRI infrared flame detectors
• Integrated Actuator Control: Supports control for actuators or PWM blower motors to manage fuel-air ratios
• Valve Proving: Built-in functionality for integrated valve leakage testing
• Undervoltage Detection: Safety feature to monitor and respond to fluctuations in supply voltage
• BCI Interface: Allows for easy parameterization and diagnostics via an AZL2 display unit or ACS410 PC software

Specifications

• Model: LME75.000A2
• Operating Voltage: AC 230 V (50/60 Hz)
• Power Consumption: Approximately 12 VA
• Protection Class: IP40 (ensured through appropriate mounting)
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 0.49 kg (1.08 lbs)
• Dimensions: 180 mm x 120 mm x 52.6 mm
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years under normal conditions)
• Safety Level: Suitable for applications up to SIL3 (Safety Integrity Level 3)

Applications

• Industrial forced draft burners for liquid or gaseous fuels
• Medium to large capacity commercial boiler systems
• Thermoprocessing plants compliant with EN 746-2 standards
• 1-stage, 2-stage, or modulating burners requiring continuous supervision
• Systems utilizing pneumatic or mechanical fuel-air ratio control
• Applications requiring advanced digital diagnostics and remote monitoring capabilities