This paper deals with investigation of the behavior of the profile curves of the melt menisci for the case of the sapphire crystal growth by EFG (Stepanov) technique. The cases of external and internal circular menisci of the crystal tube are considered. The cases of the positive and negative angles of the contact of the profile curve with the working surface of the shaper are considered. Features of the profile curves are used in the automated control systems of the crystal growth using of the weight sensor.

Profile curves of the small liquid menisci are investigated on the base of numerical solution of the YoungLaplace equation. There are considered menisci for the growth of crystal capillaries and fibers by the EFG (Stepanov) technique. Differences in the shapes of the small and "large" menisci were found.