公开(公告)号：EP0413683A4

公开(公告)日：1990-03-21

申请号：EP87906536

申请日：1987-09-21

申请人： ROSEMOUNT INC

发明人： BROWN GREGORY C ,  CUCCI GERALD R

IPC分类号： G05D16/20

CPC分类号： G05D7/005 ,  Y10T137/2365 ,  Y10T137/2409 ,  Y10T137/7759 ,  Y10T137/7761

公开(公告)号：EP0594778A4

公开(公告)日：1994-06-15

申请号：EP92916313

申请日：1992-07-01

申请人： ROSEMOUNT INC

发明人： CUCCI GERALD R ,  LEMIRE STEVEN M

IPC分类号： G01L7/08 ,  G01L19/06

CPC分类号： G01L19/0645 ,  Y10T29/49877

摘要： An isolator (10) for use in pressure transmitters comprises an isolating diaphragm (14) that is thin, and made of a suitable corrosion resistant metal, such as tantalum, and which must be anchored to an isolator housing (12) made of a substantially different metal such as stainless steel. The present invention relates to securing a support ring (24) of the same metal as the diaphragm (14) surrounding the cavity (15) formed for the isolator fluid, preforming a thin metal diaphragm (14) made of the selected material, and then welding the diaphragm (14) and a ring (34) overlaying the diaphragm directly to the support ring (24).

公开(公告)号：EP0177491A4

公开(公告)日：1988-03-30

申请号：EP84901555

申请日：1984-03-30

申请人： ROSEMOUNT INC

发明人： CUCCI GERALD R

IPC分类号： G01L9/00 ,  G01L13/06 ,  G01L19/04

CPC分类号： G01L9/125

摘要： A differential pressure sensor (10) senses a difference in pressure between a first input (low) pressure (12) or "reference pressure" and a second input (high) pressure (14) and provides a differential sensor signal representative of the difference in pressure. The reference pressure is sensed by a reference pressure sensor (26) which provides a reference signal representative of the reference pressure. The differential sensor signal and the reference signal are provided to a correction circuit. The correction circuit (24), which is preferably a digital computer, adjusts the reference signal and provides an improved output signal as a function of the differential sensor signal and the adjusted reference signal.