LME73.811A1PKG-PRG1 Siemens Flame Safeguard

Overview

The Siemens LME73.811A1PKG-PRG1 is a preprogrammed flame safeguard assembly designed for the supervision of multistage or modulating forced draft gas or oil burners. This high-performance controller is a microprocessor-based unit that ensures safe burner startup and operation by managing critical sequences like pre-purge, ignition, and flame monitoring. As an LME73 series model, it is specifically engineered for applications requiring integrated actuator control, allowing it to drive and prove actuator positions using closed-loop control. This “PKG” version is a convenient bundle that typically includes the LME73.000A1 basic unit, the PME73.811A1 program module, and a compatible plug kit.

Features

• Integrated actuator control designed to pair with SQM4 or SQM5 actuators for precise fuel-air ratio management
• Driving and proving mechanism for actuator positions during purge and ignition phases
• Built-in 3×7-segment LCD display providing real-time diagnostics, fault indication, and flame signal strength
• Versatile flame supervision supporting ionization probes or UV flame detectors like the QRA series
• Integrated valve proving function to ensure gas train integrity before burner startup
• Multi-color LED signal lamp for immediate visual notification of operating and error statuses
• BC interface for seamless connection to remote display units (AZL2) or PC-based service tools
• Programmable safety parameters including purge times and flame failure response times

Specifications

• Model: LME73.811A1PKG-PRG1
• Mains Voltage: AC 120 V (+10% / -15%)
• Power Frequency: 50/60 Hz
• Power Consumption: Approximately 12 VA
• Safety Class: I
• Degree of Protection: IP40 (when installed)
• Operating Temperature: -20 C to +60 C
• Design Lifetime: 250,000 burner startup cycles (approx. 10 years)
• Weight: Approximately 5.0 lbs (2.27 kg)
• Approvals: UL, FM, CSA, and CE globally approved

Applications

• Supervision of 1-stage or modulating forced draft gas or oil burners in intermittent operation
• Packaged burner systems requiring compact, integrated control solutions
• Industrial thermal processing plants adhering to EN 746 Part 2 standards
• Systems utilizing ratio regulators where closed-loop actuator control is beneficial
• Commercial heating and boiler applications requiring high-precision combustion management
• Gas trains requiring integrated safety functions like valve proving and air pressure supervision