Patent ID: 7775117

Claim:
A combined pressure transducer, comprising: a housing having an internal hollow with a first and a second pressure port each communicating with said hollow, a header having a front and a back section, each section having an outer surface, a central section joining said front and back sections wherein said header has an “H” shaped cross section, said front section outer surface having a first depression of a given area, a first flexible isolation diaphragm covering said first depression, said back section outer surface having a second depression of said given area, a second flexible isolation diaphragm covering said second depression where first and second diaphragms are relatively of the same size and area, a channel positioned within said central section and extending to and communicating with said first and second depressions, a first sensor structure on said header having a first sensor diaphragm, said diaphragm having a top and a bottom surface with said top surface communicating with said channel, and said bottom surface communicating with said first flexible isolation diaphragm, a second sensor structure on said header having a second sensor diaphragm also having a top and bottom surface, with said second sensor adjacent to said first sensor structure, with the bottom surface of said second sensor diaphragm communicating with said first flexible isolation diaphragm, said header positioned in said hollow of said housing and located so that said bottom surfaces of said first and second sensor diaphragm communicates with said first pressure port of said housing, and means coupling said second sensor port of said housing to said second flexible isolation diaphragm, whereby said first sensor provides a differential output indicative of the difference of pressure applied to said first and second ports and said second sensor provides an output indicative of the pressure applied to said first port.