Pressure transfer device and pressure measuring device with such pressure transfer means

US8210048B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Dieter Funken · Lörrach, DE
• Igor Getman · Lörrach, DE

Key dates

• Filing date: Jun 23, 2009
• Grant date: Jul 3, 2012
• Expiry date: Jun 23, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J3/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pressure transfer device comprises a pressure transfer device body and an isolating diaphragm, wherein, between the surface of the body of the pressure transmitting device and the isolating diaphragm, a pressure chamber is formed, whose volume is dependent on the position of the isolating diaphragm. The isolating diaphragm has a material thickness and a deflectable working region with an area A, wherein the isolating diaphragm has a reference position, in which the pressure chamber contains a reference volume Vref, and the isolating diaphragm is deflectable from the reference position at least so far in two directions, that the volume of the pressure chamber varies between values of up to Vref+/−ΔVdesired, wherein associated with a volume change ΔV is a dimensionless deflection measure w, with w(ΔV):=(3·ΔV)/(A·h), wherein ΔVdesired is dimensioned in such a way, that |w(ΔVdesired)|≧2.5; wherein, in the case of all w(ΔV), for which |w(ΔV)|≦|w′(ΔV)|, wherein |w′(ΔV)|≧0.5·|w(ΔVdesired)|, the isolating diaphragm has a non-axisymmetric deflection mode, which is superimposed on the axisymmetric deflection of w(ΔV), and wherein the deflection of the non-axisymmetric deflection mode, in t…