公开(公告)号：CA2726601C

公开(公告)日：2016-08-09

申请号：CA2726601

申请日：2009-06-17

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A

IPC: G05B15/02 ,  G05B23/02

Abstract: A wireless adapter for use in a two- wire process control loop (22) includes wireless communication circuitry and first and second terminals configured to couple in series with the two-wire process control loop (22). A regulator (152) having a regulated input is coupled to the first terminal and an output. A shunt (154) is coupled to the output of the regulator (152) and is configured to provide power to the wireless communication circuitry. A feedback circuit (158) is configured to control current flowing from the regulator (152) to the shunt (154) as a function of a loop current flowing through the two- wire process control loop (22).

公开(公告)号：CA2726534C

公开(公告)日：2016-03-22

申请号：CA2726534

申请日：2009-06-17

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  WESTFIELD BRIAN L

IPC: H04L12/40 ,  G05B19/418

Abstract: A wireless adapter for use with a two-wire process control loop (22) is configured to couple to a process field device (12) in an industrial process control system. The wireless adapter (30) is coupled to the two-wire process control loop (22) and provides wireless communication to the process field device (12). The adapter (30) includes first and second loop terminals configured to couple in series with the two-wire process control loop (22). Wireless communication circuitry (155) is coupled to the first and second loop terminals and is adapted to provide wireless communication to the process field device (12). Loop cur-rent bypass circuitry (164) is electrically connected between the first and second loop terminals and is configured to provide a loop current path therebetween in response to an open circuit in wireless communication circuitry (155).

公开(公告)号：NO300566B1

公开(公告)日：1997-06-16

申请号：NO882395

申请日：1988-05-31

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02 ,  G08C19/04

Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

公开(公告)号：CA2223151A1

公开(公告)日：1996-12-19

申请号：CA2223151

申请日：1996-05-31

Applicant: ROSEMOUNT INC

Inventor： MANICOR SCOTT D ,  NELSON RICHARD L ,  KIELB JOHN A

IPC: G01F23/284 ,  G01S13/10 ,  G01S13/08 ,  G08C19/00

Abstract: A level transmitter (10) for use in a process application measures height of a product (14) in a tank (12). The level transmitter (10) includes a microwave antenna (18) directed into the tank (10). A low power microwave source (70) sends a microwave signal through the microwave antenna (18). A low power microwave receiver (70) receives a reflected microwave signal. Measurement circuitry (42) coupled to the source and receiver initiates transmitting of the microwave signal and determines product height based upon the received, reflected signal. Output circuitry (48, 56) coupled to a two-wire process control loop (20) transmits information related to product height over the loop (20). Power supply circuitry (40) in the level transmitter (10) coupled to the two-wire process control loop (20) receives power from the loop (20) which powers the level transmitter (10) including the microwave source and the microwave receiver (70).

公开(公告)号：DK171303B1

公开(公告)日：1996-08-26

申请号：DK297588

申请日：1988-06-01

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02 ,  G08C19/04 ,  H04M11/04

Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

公开(公告)号：SG138994G

公开(公告)日：1995-01-13

申请号：SG138994

申请日：1994-09-30

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/04 ,  H04M11/04

公开(公告)号：AU611649B2

公开(公告)日：1991-06-20

申请号：AU8039387

申请日：1987-09-24

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02 ,  G08C19/04

Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

公开(公告)号：NO882395L

公开(公告)日：1988-05-31

申请号：NO882395

申请日：1988-05-31

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02 ,  G08C19/04

Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

公开(公告)号：NO882395A

公开(公告)日：1988-05-31

申请号：NO882395

申请日：1988-05-31

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02 ,  G08C19/04

CPC classification number: G08C19/02

公开(公告)号：EP0324784A4

公开(公告)日：1989-09-26

申请号：EP87906717

申请日：1987-09-24

Applicant: ROSEMOUNT INC

Inventor： KIELB JOHN A ,  NELSON RICHARD L ,  PEDERSON DAVID L

IPC: G08C19/02

CPC classification number: G08C19/02

Abstract: An existing analog two-wire transmitter (11) has a sensor module (35), and analog circuits (23) which provide an output representative of a sensed process variable, such as pressure, to a two-wire current loop (14). At least portions of the analog circuit (23) are removed and replaced with apparatus including a digital converter (52) that digitally calculates the transmitter output using the same current range in the current loop (14) and calculating corrections for obtaining linearity of the output.

Abstract translation: 现有的模拟双线变送器（11）具有传感器模块（35）和模拟电路（23），模拟电路（23）向双线电流回路（14）提供表示感测到的过程变量（例如压力）的输出。 至少部分模拟电路（23）被移除并且被包括数字转换器（52）的装置代替，该数字转换器使用电流环路（14）中的相同电流范围数字地计算发射机输出并且计算用于获得输出的线性的校正 。