公开(公告)号：CZ9600717A3

公开(公告)日：1996-11-13

申请号：CZ71796

申请日：1994-08-15

Applicant: ROSEMOUNT INC

Inventor： VOEGELE KEVIN D ,  WESTFIELD BRIAN L ,  LANCTOT JANE B

IPC: G01R27/14 ,  G01R31/28

CPC classification number: G01R27/14 ,  G01R31/2829

公开(公告)号：CA2194440A1

公开(公告)日：1996-02-01

申请号：CA2194440

申请日：1995-06-28

Applicant: ROSEMOUNT INC

Inventor： VOEGELE KEVIN D ,  PIECHOWSKI TODD A

IPC: G08C19/02 ,  G05B15/02 ,  G08C19/00

Abstract: A field mounted transmitter (10) for use in a two-wire process control loop (16a/16b) includes a sensor (12), measurement circuitry (18) and a power supply (20). The sensor (12) senses a process variable of a process which is transmitted over the control loop (16a/16b) by the measurement circuitry (18). The power supply (20) is powered by a current flowing through the control loop (16a/16b) and powers the measurement circuitry (18). The power supply (20) includes an inductive element (70) coupled to the measurement circuitry (18) and a switch (64) which selectively couples the inductive element (70) to the control loop (16a/16b).

公开(公告)号：AU7562394A

公开(公告)日：1995-03-27

申请号：AU7562394

申请日：1994-08-12

Applicant: ROSEMOUNT INC

Inventor： BRODEN DAVID A ,  ORTH KELLY M ,  BORGESON DALE W ,  LANCTOT JANE B ,  VOEGELE KEVIN D

IPC: G08C19/02

Abstract: In this invention, a multivariable transmitter providing an output representative of mass flow has a dual microprocessor structure. The first microprocessor compensates digitized process variables and the second microprocessor computes the mass flow as well as arbitrating communications between the transmitter and a master. In a second embodiment of the present invention, a first microprocessor compensates digitized process variables, a second microprocessor computes an installation specific physical parameter such as mass flow and a third microprocessor arbitrates real-time communications between the transmitter and a master.

公开(公告)号：CA2169722A1

公开(公告)日：1995-03-23

申请号：CA2169722

申请日：1994-08-15

Applicant: ROSEMOUNT INC

Inventor： VOEGELE KEVIN D ,  LANCTOT JANE B ,  WESTFIELD BRIAN L

IPC: G01R27/14 ,  G01R31/28

Abstract: An improved error detection for microprocessor-based transmitters in two-wire process control loops operating in the process control industry. In particular, techniques are shown which are useful in solving malfunctions or failures of microprocessor-based transmitters. When the transmitter is energized, the impedance of the process loop cabling is resolved and stored, displayed or transmitted as desired. The loop impedance is used to calculate potential of a power supply used to power the control loop. This information is used in testing the two-wire loop.