Patent ID: 7249515
Filing Date: 2007-07-31
Classification: G01L

Abstract:
1. A pressure sensor, comprising: a pressure measurement cell having an essentially cylindrical platform of a first diameter and a first thickness, and a measuring membrane of a second diameter and a second thickness joined to an end face of said platform; an elastic sealing ring of a third diameter and a third thickness; a support ring of a fourth outer diameter, a fourth inner diameter and a fourth thickness, with said support ring being securely connected with the end face of said pressure measurement cell facing away from said measuring membrane; a clamping ring having a first engagement means; a stiff decoupling element arranged between said clamping ring and said support ring; and a housing for accommodating said pressure measurement cell, wherein: said housing has an axial bearing surface for the seal and second engagement means, which engages with the first engagement means, said pressure measurement cell is axially clamped between said elastic sealing ring, which is arranged between said axial bearing surface of said housing and the membrane-bearing end face of said pressure measurement cell, and said support ring, by means of said clamping ring, and the dimensions of said support ring and said decoupling element are coordinated with the dimensions of said sealing ring and said pressure measurement cell such that a radial deformation of the membrane-bearing end face caused by axial clamping of said pressure measurement cell is so small, that the span error of said pressure sensor on the basis of a reduction of the axial clamping force by at least 10% amounts to not more than about 0.02% and the temperature hysteresis of the span amounts to not more than about 0.03%.