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 。