公开(公告)号：EP0746804A1

公开(公告)日：1996-12-11

申请号：EP95908768.0

申请日：1995-02-02

Applicant: ROSEMOUNT INC.

Inventor： BISCHOFF, Brian, J. ,  LENZ, Gary, A.

IPC: G05B19 ,  G05B15 ,  G05B23

CPC classification number: G05B19/0423 ,  G05B2219/25428

Abstract: A transmitter (22) in a process control loop (34) includes a sensor (40) for sensing a process variable. An analog-to-digital converter (42, 44) coupled to the sensor (40) provides a digitized process variable at various sample times. An interface (54) couples the transmitter to the control loop (34) and is used for communicating information and receiving power over the control loop (34). The transmitter (22) includes a clock (52) and a memory (50). A microprocessor (48) coupled to the clock (52) and the memory (50) stores digitized process variables and clock information in the memory (50). The storage is such that the sample time of a stored digitized process variable can be determined.

公开(公告)号：EP1290513B1

公开(公告)日：2010-10-20

申请号：EP01933150.3

申请日：2001-05-08

Applicant: ROSEMOUNT INC.

Inventor： KIRKPATRICK, William, R. ,  KARSCHNIA, Rober, J. ,  PELUSO, Marcos ,  DIMARCO, Steven, J. ,  LENZ, Gary, A.

IPC: G05B19/05

CPC classification number: G06F1/182 ,  G05B19/054 ,  G05B2219/1127 ,  G05B2219/1157 ,  G05B2219/1163 ,  G05B2219/14144 ,  G05B2219/15091 ,  G05B2219/25188 ,  G06F3/05 ,  H05K7/1472 ,  H05K7/1484

Abstract: A two-wire field-mounted process device (16) with multiple isolated channels includes a channel that can be an input channel or an output channel. The given input or output channel can be coupled to multiple sensors or actuators (32, 34), respectively. The process device (16) is wholly powered by the two-wire process control loop (14). The process device (16) includes a controller (40) adapted to measure one or more characteristics of sensors (20, 22, 24, 26, 28, 30) coupled to an input channel (42, 44, 46) and to control actuators coupled to an output channel (48). The controller can be further adapted to execute a user generated control algorithm relating process input information with process output commands. The process device also includes a loop communicator (36) that is adapted to communicate over the two-wire loop.

公开(公告)号：EP1206689B1

公开(公告)日：2004-12-01

申请号：EP00959427.6

申请日：2000-08-25

Applicant: ROSEMOUNT INC.

Inventor： ERYUREK, Evren ,  LENZ, Gary, A. ,  KAVAKLIOGLU, Kadir

IPC: G01L27/00 ,  G01D18/00

CPC classification number: G01L27/007 ,  G01D3/022 ,  G01D18/008 ,  G01L19/0092

公开(公告)号：EP0739503A1

公开(公告)日：1996-10-30

申请号：EP94923482.0

申请日：1994-07-14

Applicant: ROSEMOUNT INC.

Inventor： LENZ, Gary, A. ,  BROWN, Gregory, C. ,  WARRIOR, Jogesh

IPC: G05D3 ,  G05D7 ,  G05D16

CPC classification number: G05D7/005 ,  F16K31/1262 ,  F16K37/0083 ,  Y10T137/2452 ,  Y10T137/7759 ,  Y10T137/7761

Abstract: In this invention, a valve positioner (50) receives a setpoint from a master (62) and provides a control pressure to a valve actuator (70) for controlling a valve (72). A sensing circuit (102) in the positioner (50) senses the position of the valve (72) and the control pressure, and a control circuit (94) in the positioner (50) uses both the sensed pressure and position to provide a command output to a pneumatic section (100) which produces the control pressure.