公开(公告)号：US20150082909A1

公开(公告)日：2015-03-26

申请号：US14038065

申请日：2013-09-26

Applicant: Rosemount Inc.

Inventor： Scot Ronald Foss ,  Jared James Dreier

IPC: G01F1/58 ,  G01R31/02

CPC classification number: G01F1/588 ,  G01F1/58 ,  G01F1/60 ,  G01F15/02 ,  G01F15/022 ,  G01F25/0007 ,  G01R31/02

Abstract: A magnetic flowmeter includes a flowtube arranged to receive a flow of process fluid. A coil is positioned proximate the flowtube and arranged to apply a magnetic field to the process fluid in response to a drive current alternating direction. First and second electrodes are arranged to sense a voltage potential in the process fluid in response to the applied magnetic field. The voltage potential is indicative of flow rate of process fluid through the flowtube. A sensor is coupled to the first and second current paths which has a sensor output related to the drive current. Diagnostic circuitry provides a diagnostic output as a function of a transient change in the sensor output when current flowing through the coil alternates direction.

Abstract translation: 磁流量计包括布置成接收工艺流体流的流管。 线圈被定位在流管附近，并且布置成响应于驱动电流交替方向向过程流体施加磁场。 第一和第二电极布置成响应于所施加的磁场感测过程流体中的电压电位。 电压电位表示通过流量管的工艺流体的流量。 传感器耦合到具有与驱动电流相关的传感器输出的第一和第二电流路径。 当电流流过线圈交替方向时，诊断电路提供诊断输出作为传感器输出瞬态变化的函数。

公开(公告)号：US20150082905A1

公开(公告)日：2015-03-26

申请号：US14037915

申请日：2013-09-26

Applicant: Rosemount Inc.

Inventor： Scot Ronald Foss ,  Bruce David Rovner ,  Jared James Dreier

IPC: G01F1/58

CPC classification number: G01F1/588 ,  G01F1/60

Abstract: A magnetic flowmeter for measuring flow of a process fluid in a pipe includes a magnetic coil disposed adjacent to the pipe configured to apply a magnetic field to the process fluid. First and second electrodes are disposed within the pipe and electrically coupled to the process fluid and configured to sense an electromotive force (EMF) induced in the process fluid due to the applied magnetic field and flow of the process fluid. Input circuitry is coupled to the first and second electrodes and provides an output related to the sensed EMF. Diagnostic circuitry coupled to the input circuitry is configured to identify a saturation related condition and responsively provide a diagnostic output. In another embodiment, saturation prevention circuitry prevents saturation of the input circuitry.

Abstract translation: 用于测量管道中的工艺流体的流量的磁流量计包括与配置为向过程流体施加磁场的配管相邻的磁性线圈。 第一和第二电极设置在管内并且电耦合到过程流体并且被配置为感测由于施加的磁场和过程流体的流动而在过程流体中感应的电动势（EMF）。 输入电路耦合到第一和第二电极并提供与所感测的EMF相关的输出。 耦合到输入电路的诊断电路被配置为识别饱和相关状况并且响应地提供诊断输出。 在另一个实施例中，饱和度防止电路防止输入电路的饱和。