Pressure transmitter with improved isolator system

US6662662B1 · kind B1 · utility

Assignee

• ROSEMOUNT INC. · US

Inventors

• Christina A. Nord · Shakopee, US
• David A. Horky · Mound, US
• Kenneth Guttsen · Chaska, US
• Thomas Earl Johnson, Jr. · Dallas, US
• Matthew G. Sherin · Columbia Heights, US
• Kevin P. Szafranski · Foley, US
• William J. Ballot · New Brighton, US
• Renae M. Patrick · Eden Prairie, US
• Donald E. Harasyn · Eden Prairie, US
• Ryan R. Eidenschink · Plymouth, US
• Todd W. Schansberg · Jordan, US
• Mark G. Romo · Eden Prairie, US
• Steven M. Behm · White Bear Lake, US
• Bennett L. Louwagie · Plymouth, US
• Robert C. Hedtke · Young America, US
• Stanley E. Rud, Jr. · Victoria, US
• Jeffrey C. Brekken · Richfield, US

Key dates

• Filing date: May 4, 2000
• Grant date: Dec 16, 2003
• Expiry date: May 4, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L19/0663
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pressure transmitter with a fluid isolator that includes a sensor tube and a fill tube that have “D” shaped ends that connect together in a port internal to the transmitter. The shaped ends can be brazed into the port for sealing. Fitting both the sensor tube and the fill tube in the same port provides a low cost isolator with reduced isolator liquid volume. The fluid isolator has an isolator diaphragm with a central diaphragm region overlying a central backing plate that includes a annular groove. The annular groove avoids slow response of the isolator after an overpressure condition.