Patent ID: 8966989
Filing Date: 2015-03-03
Classification: G01L

Abstract:
1. A capacitive, ceramic, pressure measuring cell, comprising: a ceramic platform; and a ceramic measuring membrane, which is pressure tightly connected along a peripheral joint with a front side of said platform, forming a reference pressure chamber between said platform and said measuring membrane, wherein: said measuring membrane has at least a first electrode, which faces said platform; said platform has at least a second electrode, which faces said measuring membrane; the capacitance between said first electrode and said second electrode depends on a difference between a pressure externally acting on said measuring membrane and a pressure existing in said reference pressure chamber; said joint has a thickness, which defines an equilibrium distance between said measuring membrane and the front side of said platform; on the front side of said platform, a support layer is arranged, which comprises an inorganic insulator; said support layer has a thickness of at least 0.2 times said thickness of said joint; and said second electrode is arranged on said support layer.