LME75.000A1 Siemens Flame Safeguard

Overview

The Siemens LME75.000A1 is a high-performance, microprocessor-based burner control unit designed for the supervision and control of forced draft gas or oil burners of medium to high capacity. This flame safeguard base unit is engineered for continuous operation, making it ideal for industrial thermoprocessing and high-demand commercial heating systems. It provides essential safety functions, including commissioning and supervising 1-stage or modulating burners with either pneumatic or mechanical fuel-air ratio control.

Features

• Continuous Operation: Designed to handle high-demand burner cycles without the need for periodic shutdowns.
• Integrated Safety Functions: Includes undervoltage detection, air pressure supervision, and a function check of the air pressure switch during start and operation.
• Versatile Flame Supervision: Compatible with various sensors including ionization probes, self-checking UV scanners (QRA7), and infrared flame detectors (QRI).
• User Interface: Features a 3-multi color signal lamp (LED) for operational and fault status, and a BC interface for connecting an AZL2 display or PC for parameterization.
• Flexible Control: Supports integrated actuator control via 3-position controller or analog signals (0 to 10 V, 4 to 20 mA, 0 to 135 Ohm).
• Safety Standards: SIL3 capable according to DIN EN 13611 and type-tested/approved in accordance with DIN EN 298.

Specifications

• Model: LME75.000A1
• Operating Voltage: AC 120 V (50/60 Hz)
• Power Consumption: Approx. 12 VA
• Protection Rating: IP40 (ensure adequate protection at the installation site)
• Temperature Range: -20 C to +60 C
• Weight: Approximately 1.1 lbs (0.49 kg)
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years under normal operation)
• Mounting: DIN rail or screw mounting via baseplate

Applications

• Industrial forced draft burners for gaseous or liquid fuels.
• Industrial thermoprocessing equipment in accordance with EN 746-2.
• Supervision of 1-stage or modulating burners with pneumatic/mechanical ratio control.
• Integration into burner management systems requiring high safety integrity levels (SIL3).
• Replacement or new installations in medium to large capacity boiler systems and thermal process plants.