Patent ID: 6776046
Filing Date: 2004-08-17
Classification: G01L,G01M

Abstract:
A pressure-measuring device, comprising:a housing having a passage defining a first opening and a second opening; a metal diaphragm exposed to a measuring medium and situated to close off said first opening; a deformation body situated to close off said second opening; transmission liquid situated between said metal diaphragm and said deformation body for communicating pressure at said metal diaphragm to said deformation body; a capacitive pressure sensor situated in said housing which produces a measuring signal based upon a deflection of said deformation; and means for monitoring a material property of said transmission liquid, said means for monitoring being means for monitoring the relative dielectric constant &egr;r of said transmission liquid and being adapted to produce a signal indicating fracture of said metal diaphragm if said material property changes beyond a tolerance value.