Title:
CORIOLIS MASS FLOW CONTROLLER
Document Type and Number:
WIPO Patent Application WO2001036918
Kind Code:
A3
Abstract:
A capacitive pick off sensor for a mass flow measurement device is disclosed. The mass flow measurement device includes a flow sensor tube and a drive device for vibrating the flow sensor tube. The capacitive pick off sensor includes at least one conductive plate connectable to a first voltage potential and adapted to be situated adjacent the flow sensor tube which is connected to a second voltage potential. The conductive plate is positioned relative to the flow sensor tube so as to define a gap therebetween. The capacitance between the conductive plate and the flow sensor tube varies due to the relative motion of the conductive plate and the flow sensor tube when the flow sensor tube is vibrated. In other aspects of the present invention, the flow sensor tube is situated in a housing and the drive device is positioned outside the housing for vibrating the flow sensor tube.
Inventors:
BARGER MICHAEL J
DILLE JOSEPH C
WHITELEY JEFFREY L
SCOTT TIMOTHY W
DILLE JOSEPH C
WHITELEY JEFFREY L
SCOTT TIMOTHY W
Application Number:
PCT/US2000/029837
Publication Date:
March 21, 2002
Filing Date:
October 30, 2000
Export Citation:
Assignee:
MICRO MOTION INC (US)
International Classes:
G01F1/84; (IPC1-7): G01F1/84; G05D7/06
Domestic Patent References:
| WO2000034748A2 | 2000-06-15 | |||
| WO1992014123A1 | 1992-08-20 | |||
| WO1994009344A1 | 1994-04-28 | |||
| WO1996021159A1 | 1996-07-11 |
Foreign References:
| DE19605923A1 | 1997-08-21 | |||
| GB2221302A | 1990-01-31 | |||
| US4747312A | 1988-05-31 | |||
| US5448921A | 1995-09-12 | |||
| EP0803713A1 | 1997-10-29 | |||
| US4768384A | 1988-09-06 | |||
| US5493918A | 1996-02-27 | |||
| US5549009A | 1996-08-27 |
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