United States Patent
Bell et al.
(io) Patent No.: (45) Date of Patent:
US 7,168,329 B2 Jan. 30, 2007
(21) (22) (86)
LOW MASS CORIOLIS MASS FLOWMETER
HAVING A LOW MASS DRIVE SYSTEM
Inventors: Mark James Bell, Arvada, CO (US);
Roger Scott Loving, Boulder, CO
(US); Joseph C. Dille, Telford, PA (US)
Assignee: Micro Motion, Inc., Boulder, CO (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
Appl. No.: 10/540,177
PCT Filed: Feb. 4, 2003
PCT No.: PCT/US03/03335
§ 371 (c)(1),
(2), (4) Date: Jun. 17, 2005 PCT Pub. No.: WO2004/072591 PCT Pub. Date: Aug. 26, 2004
Prior Publication Data
US 2006/0042402 Al Mar. 2, 2006
U.S. CI 73/861.355; 73/861.357
Field of Classification Search None
See application file for complete search history.
U.S. PATENT DOCUMENTS 4,777,833 A 10/1988 Carpenter
A Coriolis mass flowmeter (300) having a low mass drive system comprising a driver coil (D) for vibrating flow tube means (102). The Coriolis mass flowmeter does not use a magnet affixed to the flow tube means. Instead, the flow tube means is coated with or is integral to magnetic material (103) that responds to the magnetic fields generated by the driver coil to vibrate the flow tube means. The flow tube means may comprise one (102) or more (1402C1, 1402C2) flow tubes. The magnetic material may be ferrous material devoid of an internal magnetic field. Alternatively the magnetic material may be steel or stainless steel having internal magnetic fields.
42 Claims, 8 Drawing Sheets