Patents by Inventor Bennett L. Louwagie
Bennett L. Louwagie has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7721764Abstract: A process fluid pressure measurement system includes a process fluid pressure transmitter coupled to a coplanar manifold. The coplanar manifold includes a first bore coupleable to a source of process fluid, and a vent passageway connected to the first bore and terminating in a vent hole. The coplanar manifold includes at least one port configured to receive a valve stem. Directly engaging the valve stem with the coplanar manifold selectively vents the coplanar manifold. Aspects of the present invention also include a coplanar manifold for coupling fluid to a process fluid pressure transmitter, and a method of venting such a coplanar manifold.Type: GrantFiled: October 13, 2006Date of Patent: May 25, 2010Assignee: Rosemount Inc.Inventors: Bennett L. Louwagie, David A. Broden
-
Patent number: 7454975Abstract: A pressure monitoring system provides a pressure sensor and a body that has a first coefficient of thermal expansion and includes at least one opening for accessing a process fluid. At least one isolation diaphragm is coupled to the body and positioned in the at least one opening. The at least one isolation diaphragm has a first surface in communication with the process fluid. At least one passageway is located in the body and configured to contain a fill fluid in communication with a second surface of the first isolation diaphragm. The at least one passageway is positioned between the first isolation diaphragm and the pressure sensor. At least one expansion chamber is coupled to the first passageway and includes an insert having a second coefficient of thermal expansion. The first coefficient of thermal expansion of the body is greater than the second coefficient of thermal expansion of the insert.Type: GrantFiled: April 6, 2007Date of Patent: November 25, 2008Assignee: Rosemount Inc.Inventors: Bennett L. Louwagie, Christopher L. Eriksen, David A. Broden
-
Publication number: 20080245152Abstract: A pressure monitoring system provides a pressure sensor and a body that has a first coefficient of thermal expansion and includes at least one opening for accessing a process fluid. At least one isolation diaphragm is coupled to the body and positioned in the at least one opening. The at least one isolation diaphragm has a first surface in communication with the process fluid. At least one passageway is located in the body and configured to contain a fill fluid in communication with a second surface of the first isolation diaphragm. The at least one passageway is positioned between the first isolation diaphragm and the pressure sensor. At least one expansion chamber is coupled to the first passageway and includes an insert having a second coefficient of thermal expansion. The first coefficient of thermal expansion of the body is greater than the second coefficient of thermal expansion of the insert.Type: ApplicationFiled: April 6, 2007Publication date: October 9, 2008Applicant: ROSEMOUNT INC.Inventors: Bennett L. Louwagie, Christopher L. Eriksen, David A. Broden
-
Publication number: 20080087335Abstract: A process fluid pressure measurement system includes a process fluid pressure transmitter coupled to a coplanar manifold. The coplanar manifold includes a first bore coupleable to a source of process fluid, and a vent passageway connected to the first bore and terminating in a vent hole. The coplanar manifold includes at least one port configured to receive a valve stem. Directly engaging the valve stem with the coplanar manifold selectively vents the coplanar manifold. Aspects of the present invention also include a coplanar manifold for coupling fluid to a process fluid pressure transmitter, and a method of venting such a coplanar manifold.Type: ApplicationFiled: October 13, 2006Publication date: April 17, 2008Inventors: Bennett L. Louwagie, David A. Broden
-
Patent number: 6662662Abstract: 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.Type: GrantFiled: May 4, 2000Date of Patent: December 16, 2003Assignee: Rosemount, Inc.Inventors: Christina A. Nord, David A. Horky, Kenneth G. Guttsen, Thomas E. Johnson, Matthew G. Sherin, Kevin P. Szafranski, William J. Ballot, Renae M. Patrick, Donald E. Harasyn, Ryan R. Eidenschink, Todd W. Schansberg, Mark G. Romo, Steven M. Behm, Bennett L. Louwagie, Robert C. Hedtke, Stanley E. Rud, Jr., Jeffrey C. Brekken
-
Patent number: 6307483Abstract: Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.Type: GrantFiled: April 7, 1999Date of Patent: October 23, 2001Assignee: Rosemount Inc.Inventors: Brian L. Westfield, Stephen D. Anderson, Bennett L. Louwagie, Todd A. Piechowski, Gregory C. Brown
-
Patent number: 6089097Abstract: A transmitter in a process control system transmits a pressure over a process control loop. The transmitter includes I/O circuitry, compensation circuitry and an absolute pressure sensor. The I/O circuitry transmits information over the process control loop. Compensation circuitry receives a pressure related signal and responsively controls the I/O circuitry to transmit pressure information on the loop. The absolute pressure sensor includes a cavity which deforms as the sensor deflects in response to an applied pressure. A sensor in the cavity provides the pressure related signal to the compensation circuitry in response to the deformation.Type: GrantFiled: March 3, 1997Date of Patent: July 18, 2000Assignee: Rosemount Inc.Inventors: Roger L. Frick, Bennett L. Louwagie, Adrian C. Toy
-
Patent number: 6082199Abstract: A transmitter in a process control system transmits a pressure over a process control loop. The transmitter includes I/O circuitry, compensation circuitry and an absolute pressure sensor. The I/O circuitry transmits information over the process control loop. Compensation circuitry receives a pressure related signal and responsively controls the I/O circuitry to transmit pressure information on the loop. The absolute pressure sensor includes a cavity which deforms as the sensor deflects in response to an applied pressure. A sensor in the cavity provides the pressure related signal to the compensation circuitry in response to the deformation.Type: GrantFiled: March 26, 1999Date of Patent: July 4, 2000Assignee: Rosemount Inc.Inventors: Roger L. Frick, Bennett L. Louwagie, Adrian C. Toy
-
Patent number: 6079276Abstract: A transmitter in a process control system transmits a pressure over a process control loop. The transmitter includes I/O circuitry, compensation circuitry and an absolute pressure sensor. The I/O circuitry transmits information over the process control loop. Compensation circuitry receives a pressure related signal and responsively control's the I/O circuitry to transmit pressure information on the loop. The absolute pressure sensor includes a cavity which deforms as the sensor deflects in response to an applied pressure. A sensor in the cavity provides the pressure related signal to the compensation circuitry in response to the deformation.Type: GrantFiled: June 30, 1999Date of Patent: June 27, 2000Assignee: Rosemount Inc.Inventors: Roger L. Frick, Bennett L. Louwagie, Adrian C. Toy
-
Patent number: 5963147Abstract: Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.Type: GrantFiled: July 21, 1997Date of Patent: October 5, 1999Assignee: Rosemont Inc.Inventors: Brian L. Westfield, Stephen D. Anderson, Bennett L. Louwagie, Todd A. Piechowski, Gregory C. Brown
-
Patent number: 5899962Abstract: A two-wire transmitter senses differential pressure, absolute pressure, and process temperature of a process fluid. The information can be used to provide an output representative of mass flow through a pipe. The transmitter has an electronics module housing attached to a sensor module housing. The sensor module housing contains all the sensors for the pressures and includes a boss input for receiving a signal representative of a temperature or pressure signal. The three process variables are appropriately digitized, and received by an electronics circuit board in the electronics housing including a microprocessor for calculating the mass flow. The microprocessor in the electronics housing also calculates a compressibility factor and a discharge coefficients according to a polynomials of specific forms. The boss is integral to the sensor module housing and is adapted to fit either shielded twisted pair cabling or conduit.Type: GrantFiled: January 31, 1997Date of Patent: May 4, 1999Assignee: Rosemount Inc.Inventors: Bennett L. Louwagie, Gregory S. Munson, David E. Wiklund, Michael J. Zweber, David A. Broden, Brian J. Bischoff, Gary P. Corpron
-
Patent number: 5760310Abstract: A pressure transmitter has a pressure sensor coupled to an isolator diaphragm by a fill fluid such as oil. According to the invention, means are provided for measuring the position of the isolator diaphragm and comparing the measured position with an expected position to give an indication of fill fluid leakage. Non-contact arrangements such as capacitive and ultrasonic techniques are disclosed for measuring isolator diaphragm position, as well as contacting arrangements such as switches. The fill fluid loss arrangement can be incorporated into a two-wire transmitter, which transmitter can be made to send a warning signal to a control unit when fill fluid loss is detected.Type: GrantFiled: December 20, 1996Date of Patent: June 2, 1998Assignee: Rosemount Inc.Inventors: Stanley E. Rud, Jr., William E. Petrich, Bennett L. Louwagie, Terrance F. Krouth
-
Patent number: 5650777Abstract: Conversion circuitry for use in a process control system is adapted for coupling to a primary process control loop. Digital receiver circuitry in the conversion circuitry receives a digital signal transmitted over the primary process control loop from a field transmitter and responsively provides a digital output. A microprocessor receives the digital output and responsively provides a secondary loop control output. Secondary loop control circuitry for coupling to a secondary process control loop receives the secondary loop control output from the microprocessor and responsively controls current flowing through the secondary process control loop. The current flowing through the secondary process control loop is related to the digital signal transmitted by the field transmitter.Type: GrantFiled: June 7, 1995Date of Patent: July 22, 1997Assignee: Rosemount Inc.Inventors: Brian L. Westfield, Stephen D. Anderson, Bennett L. Louwagie, Todd A. Piechowski
-
Patent number: 5637802Abstract: A transmitter in a process control system transmits a pressure over a process control loop. The transmitter includes I/O circuitry, compensation circuitry and an absolute pressure sensor. The I/O circuitry transmits information over the process control loop. Compensation circuitry receives a pressure related signal and responsively controls the I/O circuitry to transmit pressure information on the loop. The absolute pressure sensor includes a cavity which deforms as the sensor deflects in response to an applied pressure. A sensor in the cavity provides the pressure related signal to the compensation circuitry in response to the deformation.Type: GrantFiled: February 28, 1995Date of Patent: June 10, 1997Assignee: Rosemount Inc.Inventors: Roger L. Frick, Bennett L. Louwagie, Adrian C. Toy
-
Patent number: 5606513Abstract: A two-wire transmitter senses a pressure using an internal pressure sensor. The transmitter includes an input for receiving a process variable from a remote sensor which is separated from the transmitter. Circuitry in the transmitters transmits information on a two-wire process control loop which is related to the sensed pressure and the process variable.Type: GrantFiled: June 9, 1994Date of Patent: February 25, 1997Assignee: Rosemount Inc.Inventors: Bennett L. Louwagie, Gregory S. Munson, David E. Wiklund, Michael J. Zweber, David A. Broden, Brian J. Bischoff, Gary P. Corpron
-
Patent number: 5495768Abstract: An isolator diaphragm is formed and connected to a support member so it will withstand periodic high pressure cleaning. Such periodic cleaning includes use of heated, concentrated cleaning solutions flowing under high pressure from a nozzle which moves rapidly over segments of an exposed surface of the isolator diaphragm. The present invention prevents isolator diaphragm failure precipitated by the substantially incompressible isolator fluid driven toward the perimeter of the diaphragm during cleaning operations. Such cleaning operations generate a separating force between the isolator diaphragm and diaphragm support. The isolator diaphragm has a peripheral wall portion bonded to a planar support surface and is formed to have an offset center region. The peripheral wall and center region are joined by a conical, inclined wall bounding the center portion. The support member has a correspondingly shaped recess with an inclined annular wall that supports the conical wall of the diaphragm.Type: GrantFiled: July 20, 1994Date of Patent: March 5, 1996Assignee: Rosemount Inc.Inventors: Bennett L. Louwagie, Steven M. Lemire, Craig A. Everett
-
Patent number: 5157972Abstract: A metal thin film bonds a semiconductor bonding region of a diaphragm layer to a ceramic bonding region of a high modulus support block. The arrangement isolates a pressure sensing diaphragm from undesired strain, improving sensor accuracy. A passageway through the support block couples the fluid pressure to the sensing diaphragm to deflect it. Capacitive coupling between the diaphragm and a capacitor plate on the support block sense the deflection and provide an output representative of pressure.Type: GrantFiled: March 29, 1991Date of Patent: October 27, 1992Assignee: Rosemount Inc.Inventors: David A. Broden, Brian J. Bischoff, Bennett L. Louwagie
-
Patent number: D358782Type: GrantFiled: September 20, 1993Date of Patent: May 30, 1995Assignee: Rosemount, Inc.Inventors: Bennett L. Louwagie, David A. Broden, Michael J. Zweber, David E. Wiklund