Donald F Palan

58724940, Feb 16, 1999

Jun 27, 1997

8/884536

Donald Palan - Chaska MN
Dennis Smith - Minnetonaka MN
Randall C. Olson - Prior Lake MN

Rosemount Inc. - Eden Prairie MN

H01P 108
G01F 23284

333252

A waveguide assembly for a process sealed level gage includes first and second waveguide portions, a process sealing cavity and a mechanical barrier. The first waveguide portion has a first waveguide bore. The second waveguide portion is fastened to the first waveguide portion and has a second waveguide bore which is axially aligned with the first waveguide bore for communicating microwave signals at a waveguide wavelength. lambda. sub. G between the waveguide bores. The process sealing cavity is formed at an interface between the first and second waveguide portions. The mechanical barrier includes a first shaft section positioned within the first waveguide portion, a second shaft section positioned within the second waveguide portion and a raised annular shoulder positioned at the interface, within the process sealing cavity. The raised annular shoulder has a width, which is measured radially outward from an outside diameter of the shaft sections, of approximately 1/2. lambda. sub. G and a height, which is measured axially between the first and second waveguide portions, of approximately 1/4. lambda. sub. G.

57105529, Jan 20, 1998

Jun 6, 1995

8/472695

Steven J. McCoy - Eden Prairie MN
Mark S. Schumacher - Minneapolis MN
John A. Kielb - Eden Prairie MN
Donald F. Palan - Chaska MN
Grant B. Edwards - Blaine MN
Randy J. Longsdorf - Chaska MN
James E. Templin - Burnsville MN

Rosemount Inc. - Eden Prairie MN

G08C 1916

34087021

A barrier device threadably mounts to a cabling aperture on a field mounted transmitter. The field mounted transmitter receives and transmits signals, and is wholly powered by a current loop circuit. The barrier device has a conductive housing with at least a first and a second aperture and a pair of conductors passing through the first aperture of the barrier device, for connecting to a terminal block in the transmitter. A pair of signal terminals, preferably as ring tongue lug, is mounted in the second aperture of the barrier device. The signal terminals are connectable to a handheld communicator, which is used to calibrate, monitor and test the transmitter. A barrier circuit is mounted in the housing and is electrically connected between the signal terminals and the conductors. Signals from the communicator access the terminal block through the barrier circuit, and the barrier circuit limits the power available at the signal terminals. One embodiment of the barrier device has a third aperture directly across from the first aperture.

58475672, Dec 8, 1998

Sep 30, 1994

8/315429

John A. Kielb - Eden Prairie MN
Randy J. Longsdorf - Chaska MN
Grant B. Edwards - Blaine MN
Donald F. Palan - Chaska MN

Rosemount Inc. - Eden Prairie MN

G01R 2704
G01F 2328

324642

A level sensor for use in a process application measures height of a product in a tank. The level meter includes a microwave feedhorn directed into the tank, an electronics housing spaced apart from the feedhorn and a microwave waveguide extending therebetween. A microwave transducer in the housing couples to the waveguide and sends and receives microwave signals. A microprocessor in the housing identifies echoes from the microwave signals which are generated and sensed by the microwave transducer. The microprocessor determines height of the product based upon a microwave echo from the product and a microwave echo from the feedhorn. The microprocessor compensates for the effect of propagation delay through the waveguide on height measurements with the feedhorn echo and provides an output related to height of the product in the tank.

58510834, Dec 22, 1998

Oct 4, 1996

8/726145

Donald F. Palan - Chaska MN

Rosemount Inc. - Eden Prairie MN

H01P 104

403337

A microwave level gauge has a flange adaptor which includes a first end for coupling to a process connecting flange and a second end for coupling to an electronics housing. The adaptor has a section of reduced cross-sectional area along its length between the first and second ends, which defines a thermal transfer restriction that restricts heat transfer from the first end to the second end. A waveguide extends through the adaptor, from the first end to the second end.

59260807, Jul 20, 1999

Sep 29, 1997

8/939199

Donald F. Palan - Chaska MN
Mark J. Gailloux - Eden Prairie MN

Rosemount, Inc. - Eden Prairie MN

H01P 108
G01F 2300
G01R 2700

333252

A waveguide for microwave radar level gages that includes a process sealed barrier in the waveguide that is impedance matched with bore transition sections of the waveguide at opposite ends thereof. The impedance matching results in positioning of the tapered end of the barrier offset from the ends of the bore transition sections.

58776630, Mar 2, 1999

Sep 5, 1997

8/926294

Donald F. Palan - Chaska MN
Jon D. Miller - Eagan MN

Rosemount Inc. - Eden Prairie MN

H01P 108
G01F 2328

333252

A process sealed waveguide is formed in a flange mounted on a tank, and is used for transmitting microwave energy from a source of microwave energy to an aperture of an antenna on the interior of the tank. The process sealed waveguide includes a mechanical barrier to prevent escape of fluid under pressure or liquid from the interior of the tank, and also serves to reduce impedance mismatch between the air, vapor, or liquid filled waveguide or antenna apertures. The flange is mated to the microwave source through an electronic housing to flange adapter that interfaces with the flange in a manner to provide a vent in case the mechanical barrier fails so pressure is released, and to provide flame quenching if flames are present. The adapter includes a second waveguide having a process sealed mechanical barrier mounted coaxially with the mechanical barrier in the waveguide in the flange.