公开(公告)号：DE69027859D1

公开(公告)日：1996-08-22

申请号：DE69027859

申请日：1990-09-13

Applicant: ROSEMOUNT INC

Inventor： WEHRS DAVID

IPC: G01F1/60

Abstract: A transmitter provides an output representing a sensor signal which may be a flow signal generated by a magnetic flowmeter. The transmitter includes means coupled to the sensor signal for generating a scaled clock having a scaled frequency inverse to the sensor signal and means receiving the scaled clock and having a circuit node for sinking a first current received from a potential source as a product of the potential and a scaled frequency. A circuit providing the potential source delivers the first current to the node. The circuit further supplies an output current having an inverse relation to the first current which, combined with the inverse relation between a sensor signal and a scaled frequency, provides a direct relation between the output current and the sensor signal. A digital-to-analog converter is also disclosed for converting a representation of a quantity in the form of a sequence of digital values received at a first input thereof to corresponding analog signal values provided at an output thereof.

公开(公告)号：CA2620006A1

公开(公告)日：2007-03-01

申请号：CA2620006

申请日：2006-08-21

Applicant: ROSEMOUNT INC

Inventor： ERYUREK EVREN ,  KARSCHNIA ROBERT J ,  WEHRS DAVID

IPC: G01N33/28 ,  G01F1/74 ,  G01N15/06 ,  G01N29/04

Abstract: An industrial field device (10, 30, 40) provides information indicative of a process variable. The field device (10, 30, 40), includes a controller (24), communication circuitry (20, 34), a process variable sensor (28) and measurement circuitry (26). The communication circuitry (20, 34) is coupled to the controller (24). The process variable sensor (28) has an electrical characteristic that changes based on a variable of a process fluid. The measurement circuitry (26) is coupled to the process variable sensor (28) an d coupled to the controller (24). The controller (24) is configured to generat e communication via the communication circuitry (20, 34) relative to the proce ss variable, and to provide an indication of sand flow or other solids in the fluid.

公开(公告)号：WO2007024763A3

公开(公告)日：2007-06-07

申请号：PCT/US2006032553

申请日：2006-08-21

Applicant: ROSEMOUNT INC ,  WEHRS DAVID ,  KARSCHNIA ROBERT J ,  ERYUREK EVREN

Inventor： WEHRS DAVID ,  KARSCHNIA ROBERT J ,  ERYUREK EVREN

IPC: G01N33/28 ,  G01F1/74 ,  G01N15/06 ,  G01N29/04

CPC classification number: G01N33/2823 ,  G01F1/666 ,  G01F1/74 ,  G01N29/046 ,  G01N2291/02836 ,  G01P13/0006 ,  G01V1/28

Abstract: An industrial field device (10, 30, 40) provides information indicative of a process variable. The field device (10, 30, 40), includes a controller (24), communication circuitry (20, 34), a process variable sensor (28) and measurement circuitry (26). The communication circuitry (20, 34) is coupled to the controller (24). The process variable sensor (28) has an electrical characteristic that changes based on a variable of a process fluid. The measurement circuitry (26) is coupled to the process variable sensor (28) and coupled to the controller (24). The controller (24) is configured to generate communication via the communication circuitry (20, 34) relative to the process variable, and to provide an indication of sand flow or other solids in the fluid.

Abstract translation: 工业现场设备（10,30,40）提供指示过程变量的信息。 现场设备（10,30,40）包括控制器（24），通信电路（20,34），过程变量传感器（28）和测量电路（26）。 通信电路（20,34）耦合到控制器（24）。 过程变量传感器（28）具有基于过程流体的变量而改变的电特性。 测量电路（26）耦合到过程变量传感器（28）并耦合到控制器（24）。 控制器（24）被配置为经由通信电路（20,34）相对于过程变量产生通信，并且提供流体中的沙流或其他固体的指示。

公开(公告)号：CA2620006C

公开(公告)日：2013-09-24

申请号：CA2620006

申请日：2006-08-21

Applicant: ROSEMOUNT INC

Inventor： WEHRS DAVID ,  KARSCHNIA ROBERT J ,  ERYUREK EVREN

IPC: G01F1/74 ,  G01N33/28

Abstract: An industrial field device (10, 30, 40) provides information indicative of a process variable. The field device (10, 30, 40), includes a controller (24), communication circuitry (20, 34), a process variable sensor (28) and measurement circuitry (26). The communication circuitry (20, 34) is coupled to the controller (24). The process variable sensor (28) has an electrical characteristic that changes based on a variable of a process fluid. The measurement circuitry (26) is coupled to the process variable sensor (28) and coupled to the controller (24). The controller (24) is configured to generate communication via the communication circuitry (20, 34) relative to the process variable, and to provide an indication of sand flow or other solids in the fluid.

公开(公告)号：DE69027859T2

公开(公告)日：1996-12-12

申请号：DE69027859

申请日：1990-09-13

Applicant: ROSEMOUNT INC

Inventor： WEHRS DAVID

IPC: G01F1/60

Abstract: A transmitter provides an output representing a sensor signal which may be a flow signal generated by a magnetic flowmeter. The transmitter includes means coupled to the sensor signal for generating a scaled clock having a scaled frequency inverse to the sensor signal and means receiving the scaled clock and having a circuit node for sinking a first current received from a potential source as a product of the potential and a scaled frequency. A circuit providing the potential source delivers the first current to the node. The circuit further supplies an output current having an inverse relation to the first current which, combined with the inverse relation between a sensor signal and a scaled frequency, provides a direct relation between the output current and the sensor signal. A digital-to-analog converter is also disclosed for converting a representation of a quantity in the form of a sequence of digital values received at a first input thereof to corresponding analog signal values provided at an output thereof.