Pressure measuring apparatus

Claim 1

Apparatus for measuring the pressure of a fluid; comprising: a manometer having a casing; diaphragm means for transmitting the pressure of the fluid to said manometer, said diaphragm means being directly incorporated within said casing of said manometer and forming with the latter an integrated unit wherein said diaphragm means includes a diaphragm separating a first chamber in said casing from a second chamber, said first chamber being filled with a transfer fluid and said second chamber containing the fluid whose pressure is to be measured, said casing including an upper casing portion and a lower casing portion connected to each other, said diaphragm having a circumference clamped between said upper and lower casing portions; measuring means accommodated within said upper casing portion, said casing being completely filled with said transfer fluid above said diaphragm up to said measuring means wherein said upper casing portion is provided with an radially inwardly extending collar provided with a central opening and arranged above said diaphragm; and support means projecting into said opening to seal said first chamber from a remaining upper space within said upper casing portion, said support means including a manometer carrier having an extension piece projecting into said opening at a distance to said collar, a retaining ring connected to said extension piece to close said opening and a pair of gaskets to seal off said remaining upper space from said first chamber.