LME75.231A1PKG Siemens Flame Safeguard

Overview

The Siemens LME75.231A1PKG is a high-performance, microprocessor-based flame safeguard package designed for the supervision and control of forced draft burners. This comprehensive kit includes the LME75.000A1 base unit, the PME75.231A1 program module, and a complete plug set to streamline installation. Engineered for medium to large capacity industrial and commercial burners, it is specifically capable of supporting continuous operation exceeding 24 hours. The LME75 system provides precise control for 1-stage, 2-stage, or modulating burners with pneumatic or mechanical fuel-air ratio control, ensuring high safety standards and reliable combustion management.

Features

• Continuous Operation: Specifically designed to manage burners that run for more than 24 hours without interruption.
• Integrated Interface: Features a built-in BCI interface for seamless connection to AZL2 display units or PC software for easy parameterization.
• Multi-Color Status Indication: Utilizes an integrated LED signal lamp and 3 x 7-segment display to provide clear operational and fault status messages.
• Flexible Flame Supervision: Compatible with a variety of flame detectors including ionization probes, QRA7 UV sensors, and QRI infrared sensors.
• SIL3 Capable: Classified as SIL3 capable according to DIN EN 13611, making it suitable for high-safety-level industrial applications.
• Advanced Diagnostics: Includes undervoltage detection, air pressure supervision with functional checks, and an electrical remote lockout reset facility.
• Modulating Control: Supports control for one actuator and offers analog inputs for load controllers (0 to 10 V, 4 to 20 mA, or 0 to 135 Ω).

Specifications

• Model Number: LME75.231A1PKG
• Supply Voltage: AC 120 V (50/60 Hz)
• Base Unit: LME75.000A1
• Program Module: PME75.231A1
• Operating Temperature: -20 C to +60 C
• Designed Lifetime: 250,000 burner startup cycles (approximately 10 years)
• Protection Rating: IP40 (when installed correctly)
• Approvals: UL, FM, CSA, and CE certified
• Weight: Approximately 5.0 lbs (package weight)

Applications

• Industrial Forced Draft Burners: Used in large-scale thermal processing plants and industrial boilers.
• Commercial Heating Systems: Suitable for high-capacity 1-stage or modulating gas and oil burners.
• Continuous Burner Operation: Ideal for applications requiring uninterrupted combustion, such as industrial ovens or kilns.
• Linkageless Control Systems: Often paired with Siemens SQM4 or SQM5 actuators for precise electronic fuel-air ratio control.
• Retrofit and New Installations: The package format makes it an ideal choice for both upgrading legacy flame safeguards and new burner equipment manufacturing.