LME71.901A1-PRG7 Siemens Flame Safeguard

Overview

The Siemens LME71.901A1-PRG7 is a high-performance, microprocessor-based flame safeguard designed for the startup and supervision of 1- or 2-stage gas forced draft burners in intermittent operation. This specific model is a preprogrammed assembly that includes the LME71.000A1 base unit paired with the PME71.901A1 programming module. It is engineered for industrial thermal process applications, particularly those utilizing pulse width modulated (PWM) fans and pneumatic ratio control. The system provides critical safety functions by energizing safety shutoff valves while monitoring for the presence of a flame to prevent hazardous conditions.

Features

• PWM blower control designed specifically for PWM fan applications
• Integrated valve proving and Proof of Closure (POC) input for enhanced combustion safety
• Multicolor LED signal lamp provides clear indication of error status, program sequence, and operating states
• Support for multiple flame detection methods including ionization probes and non-self-checking UV scanners
• Electrical remote lockout reset facility for convenient system management
• Digital signal handling ensures accurate control sequences and reliable performance
• Undervoltage detection mechanism to protect the burner system during power fluctuations

Specifications

• Model: LME71.901A1-PRG7 (Preprogrammed LME71.901A1PKG)
• Mains Voltage: AC 120 V (50/60 Hz)
• Components Included: LME71.000A1 Base Unit and PME71.901A1 Programming Module
• Components Excluded: Connector plug sets (less plugs)
• Power Consumption: Approximately 12 VA
• Safety Standards: UL, FM, CSA, UKCA, and CE approved
• Designed Lifetime: 250,000 burner startup cycles (approx. 10 years of service)
• Protection Rating: IP40 (when properly mounted)
• Operating Temperature: -20 C to +60 C

Applications

• Supervision of multistage or modulating forced draft burners of medium to high capacity
• Industrial thermal process plants and heating equipment management
• Atmospheric gas burners requiring intermittent operation and PWM fan control
• Burner systems requiring integrated valve proving without separate actuator control
• HVAC and boiler systems in industrial and commercial environments seeking advanced diagnostics and Modbus communication options