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).