LME are used for the startup and supervision of 1- or 2-stage gas burners or gas burners in intermittent operation.  Flame supervision takes place via an ionization probe or a QRA UV flame detector with AGQ3. xA27 ancillary unit for forced draft gas burners, or, in the case of blue-burning flames, with a QRC blue-flame detector.  In terms of housing dimensions, the LME are identical with the burner control LGB and LMG burner controls.