Device for measuring pressure
First Claim
1. A device for measuring or monitoring the pressure in a medium or differences in pressure between two media, by monitoring changes in the resonant frequency of a vibrating stress member coupled to a surface in the medium or media, or surfaces in the media, wherein the device comprises a housing defining a first sealed chamber, the housing having at least one wall, and at least one measurement surface for placing in the medium or media, the stress member being a shell inside the chamber and the device including means for mechanically converting the force resulting from the pressure of the medium in which the measurement surface is placed into a stress in the stress member.
1 Assignment
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Accused Products
Abstract
A pressure measuring device (2) comprises a vibrating ferromagnetic cylinder (4) and mechanically located within a casing (6). A diaphragm (24) is directly connected to the cylinder and forms a pressure measurement surface. Pressure on the diaphragm (24) results in a force and stresses in the cylinder (4) which change the resonant frequency of the vibrating cylinder.
14 Citations
26 Claims
- 1. A device for measuring or monitoring the pressure in a medium or differences in pressure between two media, by monitoring changes in the resonant frequency of a vibrating stress member coupled to a surface in the medium or media, or surfaces in the media, wherein the device comprises a housing defining a first sealed chamber, the housing having at least one wall, and at least one measurement surface for placing in the medium or media, the stress member being a shell inside the chamber and the device including means for mechanically converting the force resulting from the pressure of the medium in which the measurement surface is placed into a stress in the stress member.
- 25. A device for measuring or monitoring the pressure in a medium or differences in pressure between two media, by monitoring changes in the resonant frequency of a vibrating stress member coupled to a surface in the medium or media, or surfaces in the media, wherein the device comprises a housing defining a first sealed chamber, the housing having at least one wall, and at least one measurement surface for placing in the medium or media, the stress member being a shell defining a second chamber within the first sealed chamber, and the device including means for mechanically converting the force resulting from the pressure of the medium in which the measurement surface is placed into a stress in the stress member, wherein the measurement surface is a flexible diaphragm immediately adjacent the stress member and the first and second chambers are connected by a passage in the shell.
Specification