Siemens Burner Controllers LME7 Series

The LME7xx burner controls are microprocessor-based systems with matching components designed to control and supervise medium- to large-capacity forced-draft burners. They are used for the startup and monitoring of multistage or modulating forced-draft burners and atmospheric gas burners in intermittent operation. The fuel/air ratio can be adjusted via an air damper actuator for mechanical or pneumatic control, or through pulse-width–modulated fans combined with pneumatic ratio control.

Flame supervision options:

• Ionization probe

• UV flame detectors QRA2 / QRA4 / QRA10

• Photoresistive detectors QRB1 / QRB3

• Yellow flame detector QRB4

• Blue-flame detector QRC

LME71, LME73, and LME75 burner controllers provide advanced flame safeguards, setting a new benchmark for flexible and cost-effective burner supervision. They feature simplified installation, programming, and commissioning, combined with proven field reliability.