公开(公告)号：WO2011005938A3

公开(公告)日：2011-01-13

申请号：PCT/US2010/041338

申请日：2010-07-08

Applicant: ROSEMOUNT INC. ,  LECUYER, Gregory, J. ,  WEHRS, David, L. ,  LO, Jessica ,  MCCOY, Steven, J. ,  WESTFIELD, Brian, L.

Inventor： LECUYER, Gregory, J. ,  WEHRS, David, L. ,  LO, Jessica ,  MCCOY, Steven, J. ,  WESTFIELD, Brian, L.

IPC: G01D21/00 ,  G05B19/042 ,  G08C19/02 ,  G05B23/02

Abstract: A two-wire process variable transmitter (12) for use in an industrial process, including a process variable sensor (14) configured to sense a process variable of a fluid of the industrial process. Output circuitry (36) is configured to provide an output on a two-wire process control loop (18) which is related to the sensed process variable. Loop current measurement circuitry (36) measures a loop current flowing through the two-wire process control loop (18) and terminal voltage measurement circuitry (36) measures a voltage related to a terminal voltage of the process variable transmitter (12). The terminal voltage can be a voltage measured across an electrical connection of the two-wire process variable transmitter (12) to the two-wire process control loop (18). Input circuitry (36) is configured to receive a diagnostic command from the two-wire process control loop (18). A microprocessor (30) configured to perform loop diagnostics on the two-wire process control loop (18) based upon the measured loop current and terminal voltage in response to receipt of a diagnostic command from the two-wire process control loop (18).

公开(公告)号：WO2011005938A2

公开(公告)日：2011-01-13

申请号：PCT/US2010041338

申请日：2010-07-08

Applicant: ROSEMOUNT INC ,  LECUYER GREGORY J ,  WEHRS DAVID L ,  LO JESSICA ,  MCCOY STEVEN J ,  WESTFIELD BRIAN L

Inventor： LECUYER GREGORY J ,  WEHRS DAVID L ,  LO JESSICA ,  MCCOY STEVEN J ,  WESTFIELD BRIAN L

IPC: G01D18/00

CPC classification number: G01D21/00 ,  G05B19/0423 ,  G05B2219/24069

Abstract: A two-wire process variable transmitter (12) for use in an industrial process, including a process variable sensor (14) configured to sense a process variable of a fluid of the industrial process. Output circuitry (36) is configured to provide an output on a two-wire process control loop (18) which is related to the sensed process variable. Loop current measurement circuitry (36) measures a loop current flowing through the two-wire process control loop (18) and terminal voltage measurement circuitry (36) measures a voltage related to a terminal voltage of the process variable transmitter (12). The terminal voltage can be a voltage measured across an electrical connection of the two-wire process variable transmitter (12) to the two-wire process control loop (18). Input circuitry (36) is configured to receive a diagnostic command from the two-wire process control loop (18). A microprocessor (30) configured to perform loop diagnostics on the two-wire process control loop (18) based upon the measured loop current and terminal voltage in response to receipt of a diagnostic command from the two-wire process control loop (18).

Abstract translation: 一种用于工业过程的双线过程变量变送器（12），包括过程变量传感器（14），其被配置为感测工业过程的流体的过程变量。 输出电路（36）被配置成在与所感测的过程变量有关的双线过程控制回路（18）上提供输出。 回路电流测量电路（36）测量流过双线过程控制回路（18）的回路电流，并且端子电压测量电路（36）测量与过程变量变送器（12）的端子电压相关的电压。 端电压可以是通过双线过程变量变送器（12）的电连接到双线过程控制回路（18）测量的电压。 输入电路（36）被配置为从双线过程控制回路（18）接收诊断命令。 微处理器（30）被配置为响应于从双线过程控制回路（18）接收到诊断命令，基于测量的回路电流和端子电压对双线过程控制回路（18）执行回路诊断。