LME71.402A1PKG-PRG2 Siemens Flame Safeguard

Overview

The Siemens LME71.402A1PKG-PRG2 is a high-performance, microprocessor-based flame safeguard assembly designed for the startup and supervision of multistage or modulating forced draft burners. This specific package comes pre-programmed and includes the LME71.000A1 basic unit, the PME71.402A1 program module, and a complete connector plug kit. Engineered for industrial and commercial combustion applications, it provides critical safety functions by monitoring the flame and controlling safety shutoff valves to prevent hazardous conditions during burner operation.

Features

• Digital signal handling for accurate control sequences and high repeatability
• Integrated multicolor LED signal lamp for clear status and error messaging
• Built-in 3 x 7-segment display for local service, error, and status information
• Electrical remote lockout reset facility for convenient system management
• Comprehensive air pressure supervision with functional checks during startup and operation
• Support for multiple flame detection methods including ionization probes and various UV or photo-resistive detectors
• BC interface for connecting external displays or PC diagnostic tools
• Designed for a service life of approximately 250,000 burner startup cycles

Specifications

• Model: LME71.402A1PKG-PRG2
• Input Voltage: AC 120 V (+10% / -15%)
• Frequency: 50/60 Hz
• Power Consumption: Approximately 12 VA
• Protection Rating: IP40 (when mounted)
• Operating Temperature: -20 C to +60 C
• Safety Class: I
• Flame Supervision: Ionization probe or UV flame detectors (QRA2, QRA4, or QRA10)
• Enclosure Dimensions: Approximately 12 x 8 x 8 inches
• Total Weight: 5.0 lbs

Applications

• Supervision of forced draft gas or oil burners of medium to high capacity
• Management of atmospheric gas burners in intermittent operation
• Control of multistage or modulating burners in industrial heating and process plants
• Use in HVAC systems and boiler controls requiring precise fuel-air ratio management
• Integration into burner systems requiring remote diagnostics and Modbus communication capabilities