The burner controls of the LFL1... range are designed for the control and supervision of forced draught gas burners of both expanding flame and interrupted pilot construction of medium to high capacity. They are universally applicable and can be used for both multistage and modulating burners as well as for dual-fuel burners and for burners of stationary air heaters (WLE to DIN 4794). The difference between series 01 and 02 lies in the duration of the safety time for the pilot burner of burners using pilot gas valves. For atmospheric burners of high capacity, type LFL1.638 is available. For burner controls used with burners in continuous operation, types LGK16... .