Product Overview
The Siemens LME7 series (including models LME71, LME72, LME73) is a family of microprocessor‑based burner control units designed to manage complete combustion sequences for forced‑draft burners of medium to large capacity. These controllers are built for intermittent operation, meaning they handle repeated cycles of ignition, flame supervision, operation, and safe shutdown. The units are intended for original equipment manufacturer (OEM) integration in industrial heating and combustion systems where precise control and safety supervision are critical.
Key Features
Microprocessor‑Based Control Logic: Provides accurate and reproducible timing and sequencing for ignition, flame establishment, and shutdown.
Automatic Burner Sequencing: Controls pre‑purge, pilot/main ignition, fuel release sequencing, and shutdown to ensure efficient and safe combustion cycles.
Flexible Flame Supervision: Supports multiple flame detectors such as ionization probes, UV scanners (e.g., QRA2, QRA4, QRA10), and photo‑resistive detectors for both oil and gas burners.
Air Pressure & Safety Monitoring: Integrates checks for air damper/pressure switch during startup and operation to ensure correct air flow before fuel is released.
Safety Interlocks & Lockout: Automatic fault lockout, remote reset, undervoltage detection, and controlled restart limits enhance operational safety.
Diagnostic Indicators: Multicolor LED status and fault indication help technicians troubleshoot and maintain systems.
Modular Program Module Support: Optional program modules (PME71/PME73) allow tailored control logic and advanced configuration for different burner types.
Applications
Forced‑Draft Burners: Ideal for controlling gas, oil, or dual‑fuel forced‑draft burners in industrial furnaces, boiler rooms, and thermal processing systems.
Multistage/Modulating Burners: Suitable for burners requiring several firing stages or modulating (variable output) control.
Intermittent Operation Systems: Designed to meet safety standards where burners cycle on/off frequently during production or heating cycles.
OEM Integration: Frequently used by equipment manufacturers in packaged heating systems, industrial combustion equipment, and control panels.
Why Choose This Product
Proven Reliability: Digital microprocessor control ensures stable, accurate combustion sequences with repeatable performance over extended use.
Enhanced Safety: Integrated air pressure checks, flame supervision, and lockout logic help protect systems and personnel from unsafe combustion conditions.
Flexible Integration: Compatible with a broad range of flame detectors and optional program modules for configuration flexibility.
Diagnostic Support: Status and fault indicators improve serviceability, reduce downtime, and expedite maintenance procedures.
Standards Compliance: Designed and approved to align with relevant industrial burner safety standards (e.g., EN 267, EN 676) required for use in industrial combustion setups.