公开(公告)号：HK6396A

公开(公告)日：1996-01-19

申请号：HK6396

申请日：1996-01-11

Applicant: ROSEMOUNT INC

Inventor： KNECHT THOMAS A ,  FRICK ROGER L ,  BREUSEHOFF STEVEN M

IPC: G01L20060101 ,  G01L7/08 ,  G01L9/00 ,  G01L9/12 ,  G01L13/00 ,  G01L13/02 ,  G01L9/04

Abstract: A cell for sensing differential pressures has a single brittle material diaphragm mounted on support plates positioned on opposite sides of the diaphragm. The diaphragm surfaces when at zero differential pressure facing the support are concave and shaped to conform very closely to the shape the diaphragm has when it is deflected so that when the diaphragm is under a selected pressure and it is forced against one of the supports in either direction, the diaphragm is substantially planar or flat and supported fully on its support plate. The diaphragm may be shaped by placing it under a pressure so that it bows or deflects and then grinding the surface opposite from the applied pressure flat. When the pressure is removed, the diaphragm relaxes and a cavity with the exact required shape is produced on the surface that had been bowed out and ground flat. The same procedure can be done to the other side of the diaphragm or two diaphragm sections may be fixed together.