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公开(公告)号：JPH102824A
公开(公告)日：1998-01-06
申请号：JP7090797
申请日：1997-03-10
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , RUF JAMES , SCHULTE JOHN P
Abstract: PROBLEM TO BE SOLVED: To provide a pressure sensor which displays that there is a reference pressure in a sealed chamber on one principal plane of a diaphragm part. SOLUTION: A cap member 82 is fixed for sealing on one principal plane of a diaphragm part 79 to form a sealed chamber between them and presence of reference pressure is easily discriminated by deflecting the cup member 82 to inner direction when the sealed chamber is in reference pressure (vacuum). A diaphragm assembly 77 is fix on a fitting plane through a stress separation layer 71 and whereby transmission of distortion from the fitting plane is reduced and measuring error is reduced.
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公开(公告)号：FI96991C
公开(公告)日：1996-09-25
申请号：FI885292
申请日：1988-11-16
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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公开(公告)号：AT132968T
公开(公告)日：1996-01-15
申请号：AT89911696
申请日：1989-10-17
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , NAUMAAN AHMED , RUD STANLEY E JR
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公开(公告)号：HU207160B
公开(公告)日：1993-03-01
申请号：HU346887
申请日：1987-06-12
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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.
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公开(公告)号：CA1300925C
公开(公告)日：1992-05-19
申请号：CA543028
申请日：1987-07-27
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , ROMO MARK G
Abstract: A deflecting ?iaphragm differential pressure sensor is formed so all electrical elements and connections from external circuitry to the sensor are isolated from the pressure media. The deflecting, pressure sensing diaphragm is made of a semi-conductor material, having piezoresistors disposed on a surface thereof to form strain gages to sense deflection of the diaphragm. The strain gage resistors are media isolated by a layer that overlies the strain gage resistors. All forms of the invention provide environmental protection for the electrical connections for external circuitry, which are subject to corrosion from the pressure media.
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Patent Agency Ranking
公开(公告)号：IN169797B
公开(公告)日：1991-12-21
申请号：IN399MA1987
申请日：1987-06-01
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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.
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公开(公告)号：AU610070B2
公开(公告)日：1991-05-16
申请号：AU7544587
申请日：1987-06-12
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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.
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公开(公告)号：BR8707761A
公开(公告)日：1989-08-15
申请号：BR8707761
申请日：1987-07-23
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , ROMO MARK G
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公开(公告)号：FI96991B
公开(公告)日：1996-06-14
申请号：FI885292
申请日：1988-11-16
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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.
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公开(公告)号：MX163905B
公开(公告)日：1992-06-30
申请号：MX693787
申请日：1987-06-15
Applicant: ROSEMOUNT INC
Inventor： KNECHT THOMAS A , FRICK ROGER L , BRUESEHOFF STEVEN M
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.
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