公开(公告)号：EP0724714A1

公开(公告)日：1996-08-07

申请号：EP94901169.0

申请日：1993-10-18

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell ,  FRICK, Roger

IPC分类号： G01F1 ,  G01F15

摘要： A vortex flow transmitter (10) has a filtering circuit (20) receiving a noise contaminated input signal representative of the flow and which has a fundamental frequency varying responsively to flow. The filter (20) filters the input signal using one of a family of HP filter characteristics. Each member of the family of HP filters has varying corner frequencies, each filter having a unique switchup and a unique switchdown value assigned to it. Adaptive response means (40) select a current HP filter for use in the filter means. The adaptive means use one selection method when the flow is increasing and another selection method when the flow decreases. Output means (52) convert the signal from the filter means into a transmitter output, typically a 4-20 mA current or a frequency output representative of the flow.

公开(公告)号：EP1212588A1

公开(公告)日：2002-06-12

申请号：EP00961788.7

申请日：2000-09-12

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell

IPC分类号： G01F1/42

CPC分类号： G01F1/42

摘要： A flow device (100) including a differential flow plate (108) insertable into a flow path between pipe sections (58-1, 58-2) including a flow conduit (110) supporting a flow interrupter (112) and differential pressure taps (114, 116). The flow conduit (110) including a seamless interface (154) between the flow interrupter (112) and the pressure taps (114, 116) to reduce non-attributable pressure loss between differential pressure taps (114, 116) as well as reduce field installation labor including that of pressure testing the various pressure couplings.

公开(公告)号：EP1212594B1

公开(公告)日：2005-11-23

申请号：EP00961787.9

申请日：2000-09-12

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell

IPC分类号： G01K13/02 ,  G01F1/36

CPC分类号： G01F1/42 ,  F16L23/006 ,  G01F1/363 ,  G01K13/02

公开(公告)号：EP0724714B1

公开(公告)日：2000-02-02

申请号：EP94901169.6

申请日：1993-10-18

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell ,  FRICK, Roger

IPC分类号： G01F1/32

摘要： A vortex flow transmitter (10) has a filtering circuit (20) receiving a noise contaminated input signal representative of the flow and which has a fundamental frequency varying responsively to flow. The filter (20) filters the input signal using one of a family of HP filter characteristics. Each member of the family of HP filters has varying corner frequencies, each filter having a unique switchup and a unique switchdown value assigned to it. Adaptive response means (40) select a current HP filter for use in the filter means. The adaptive means use one selection method when the flow is increasing and another selection method when the flow decreases. Output means (52) convert the signal from the filter means into a transmitter output, typically a 4-20 mA current or a frequency output representative of the flow.

公开(公告)号：EP1212588B1

公开(公告)日：2008-03-12

申请号：EP00961788.7

申请日：2000-09-12

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell

IPC分类号： G01F1/42

CPC分类号： G01F1/42

摘要： A flow device (100) including a differential flow plate (108) insertable into a flow path between pipe sections (58-1, 58-2) including a flow conduit (110) supporting a flow interrupter (112) and differential pressure taps (114, 116). The flow conduit (110) including a seamless interface (154) between the flow interrupter (112) and the pressure taps (114, 116) to reduce non-attributable pressure loss between differential pressure taps (114, 116) as well as reduce field installation labor including that of pressure testing the various pressure couplings.

公开(公告)号：EP1212594A1

公开(公告)日：2002-06-12

申请号：EP00961787.9

申请日：2000-09-12

申请人： ROSEMOUNT INC.

发明人： KLEVEN, Lowell

IPC分类号： G01K13/02 ,  G01F1/36

CPC分类号： G01F1/42 ,  F16L23/006 ,  G01F1/363 ,  G01K13/02

摘要： A differential flow plate (102) insertable into a flow path (106) including a flow interrupter (110) extending about an outer periphery (122) of the flow path (106) forming a constricted flow opening and a temperature sensor channel (120) disposed proximate to the flow interrupter (10).