Abstract: A low-pressure vessel cover includes a plate-shaped base for placing on a vessel edge of a low-pressure vessel, a first opening in the base, and an acoustic signaling device for detecting a boiling point of a liquid which is heated in the low-pressure vessel. The signaling device includes a note-sounding plate system, which has a note-sounding plate, a note-sounding plate opening, and a note-sounding tongue. The note-sounding plate system is arranged in a first flow channel which extends from the first opening in the base to a first outlet opening such that the note-sounding tongue is excited by out-flowing fluid and generates a signaling tone of at least 40 dB.

Abstract: The disclosure relates to a kitchen appliance for placement on vessels having a substantially circular opening edge, having a plate-shaped base body made of a first material having a recess into which at least one type of functional unit can be temporarily introduced. The base body is formed to have a shell-like shape as well as a concave and a convex side. At least on the convex side of the shell-shaped base body, a contact surface made of a second material is attached in sections, wherein the second material effects a greater frictional force in contact with the material of the vessel than the first material.