公开(公告)号：US09182256B2

公开(公告)日：2015-11-10

申请号：US12832341

申请日：2010-07-08

Applicant: David L. Wehrs ,  Gregory J. LeCuyer ,  Jessica Lo ,  Steven J. McCoy ,  Brian L. Westfield

Inventor： David L. Wehrs ,  Gregory J. LeCuyer ,  Jessica Lo ,  Steven J. McCoy ,  Brian L. Westfield

IPC: G01R11/17 ,  G01R11/16 ,  G06F3/00 ,  G06F3/01 ,  G01D21/00 ,  G05B19/042

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

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

Abstract translation: 一种用于工业过程的二线过程变量变送器，包括被配置为感测工业过程流体的过程变量的过程变量传感器。 输出电路被配置为在与所感测的过程变量相关的二线过程控制回路上提供输出。 回路电流测量电路测量流过两线制过程控制回路的回路电流，并且端子电压测量电路测量与过程变量变送器的端子电压相关的电压。 端子电压可以是两线制过程变量发射机与两线制过程控制回路的电气连接测量的电压。 输入电路配置为从两线制过程控制回路接收诊断命令。 该微处理器被配置为响应于从两线制过程控制回路接收到诊断命令，基于所测量的回路电流和端子电压在两线制过程控制回路上执行循环诊断。

公开(公告)号：US07458280B2

公开(公告)日：2008-12-02

申请号：US11654893

申请日：2007-01-18

Applicant: David L. Wehrs ,  Russell N. Evans ,  Ghidewon Arefe

Inventor： David L. Wehrs ,  Russell N. Evans ,  Ghidewon Arefe

IPC: G01F1/34

CPC classification number: G01F1/74 ,  G01F1/34 ,  G01F1/36 ,  G01F15/08

Abstract: A process pressure fluid transmitter is coupled to a differential pressure producer and measures a differential pressure across the producer. A statistical parameter is calculated upon successive differential pressure indications, and the calculated parameter is used to indicate wet gas flow. The indication can be generated locally at the process pressure transmitter, communicated via a wired process communication loop, communicated wirelessly, or any combination thereof.

Abstract translation: 过程压力流体变送器耦合到差压生产者并测量整个生产者的差压。 统计参数是在连续差压指示下进行计算的，计算参数用于表示湿气流量。 该指示可以在过程压力变送器处本地产生，经由有线过程通信环路，无线通信或其任何组合进行通信。

公开(公告)号：US06615149B1

公开(公告)日：2003-09-02

申请号：US09576450

申请日：2000-05-23

Applicant: David L. Wehrs

Inventor： David L. Wehrs

IPC: G01R2318

CPC classification number: G01D3/032 ,  G01D3/0365 ,  G01F1/58 ,  G01F1/60 ,  G01F25/0007

Abstract: A magnetic flow transmitter provides a coil driver output at a selected fundamental to a coil on a flow tube carrying a flow of a liquid. An amplifier amplifies an electrode signal from the flow tube and an A/D converter converts the amplified electrode signal. A digital signal processor (DSP) uses a spectral transform such as a Fourier type transform to generate a flow output based on spectral components at or near the fundamental and a noise diagnosing output based on components at or near a noise frequency.

Abstract translation: 磁流量变送器将线圈驱动器输出到选定的基准线上，并在流动管上承载液体流。 放大器放大来自流管的电极信号，A / D转换器转换放大的电极信号。 数字信号处理器（DSP）使用诸如傅立叶型变换之类的频谱变换来产生基于基波处或附近的频谱分量的流量输出，以及基于噪声频率处或附近的分量的噪声诊断输出。

公开(公告)号：US06594613B1

公开(公告)日：2003-07-15

申请号：US09209134

申请日：1998-12-10

Applicant: Kevin Ley ,  David C. Bohn ,  David L. Wehrs

Inventor： Kevin Ley ,  David C. Bohn ,  David L. Wehrs

IPC: H04B1500

CPC classification number: G01D3/032 ,  G01D3/0365 ,  G01F1/58 ,  G01F25/0007

Abstract: A process variable transmitter providing a transmitter output representing a process variable sensed by a sensor. The transmitter has a filter with a bandwidth which is automatically adjusted based on noise detected in a sensor output. When the transmitter senses higher sensor noise levels, it automatically decreases the bandwidth to damp noise in the transmitter output. When the transmitter senses lower sensor noise levels, it automatically increases the bandwidth to provide faster response to changes in the process variable.

Abstract translation: 提供表示由传感器感测的过程变量的发射器输出的过程变量发射器。 发射机具有带宽的滤波器，该滤波器根据传感器输出中检测到的噪声自动调整。 当发射机感测到更高的传感器噪声电平时，它会自动降低带宽以抑制发射机输出中的噪声。 当发射机感测较低的传感器噪声电平时，它会自动增加带宽，以便对过程变量的变化提供更快的响应。

公开(公告)号：US5079957A

公开(公告)日：1992-01-14

申请号：US409935

申请日：1989-09-20

Applicant: David L. Wehrs

Inventor： David L. Wehrs

IPC: G01F1/60

CPC classification number: G01F1/60

Abstract: A magnetic flowmeter generates an alternating potential representing flow. A controlled current excites the flowmeter with first and second amplitudes of current. A correction output represents the first and second amplitudes. A circuit connected to the correction output and the alternating potential oscillates at a frequency representing the alternating potential corrected for variation of the first and second amplitudes. Frequencies of the oscillations at first and second amplitudes are measured. An output is calculated as a function of a subtraction of the first and second measured frequencies such that the effect of offset is reduced.

Abstract translation: 磁流量计产生代表流量的交替电位。 受控电流以第一和第二电流幅度激发流量计。 校正输出表示第一和第二幅度。 连接到校正输出和交替电位的电路以表示针对第一和第二幅度的变化而被校正的交变电位的频率振荡。 测量第一和第二幅度振荡的频率。 作为第一和第二测量频率的减法的函数计算输出，使得偏移的影响减小。

公开(公告)号：US08290721B2

公开(公告)日：2012-10-16

申请号：US11503878

申请日：2006-08-14

Applicant: David L. Wehrs ,  Evren Eryurek

Inventor： David L. Wehrs ,  Evren Eryurek

IPC: G01F1/00 ,  G06F19/00

CPC classification number: G01F25/0007 ,  G01F15/00

Abstract: A flow meter for measuring flow of a process fluid includes a sensor configured to provide a sensor output signal. The sensor output signal is related to flow of the process fluid. Circuitry in the flow meter is configured to determine a statistical parameter related to sensor output signal. Diagnostic circuitry provides a diagnostic output based upon the determined statistical parameter and the sensor output signal.

Abstract translation: 用于测量过程流体的流量的流量计包括被配置为提供传感器输出信号的传感器。 传感器输出信号与过程流体的流量有关。 流量计中的电路配置为确定与传感器输出信号相关的统计参数。 诊断电路根据确定的统计参数和传感器输出信号提供诊断输出。

公开(公告)号：US07521944B2

公开(公告)日：2009-04-21

申请号：US11648198

申请日：2006-12-28

Applicant: David L. Wehrs

Inventor： David L. Wehrs

IPC: G01R27/08 ,  G01F23/00

CPC classification number: G01M3/16 ,  G01M3/40 ,  H05K7/1462

Abstract: A field device detects the presence of fluid in the terminal block area of the field device by generating an alternating current (AC) test current signal and measuring the amplitude of the resulting AC voltage signal. The field device includes a first terminal and a second terminal adapted for connection to a control room through a twisted-wire pair current loop. Impedance of the current loop is increased by the presence of fluid between the first terminal and the second terminal. By providing an AC test current signal to the control loop and measuring a resulting AC voltage magnitude, the impedance of the control loop can be determined. Increased impedance in the control loop indicates the presence of water in the terminal block.

Abstract translation: 现场设备通过产生交流（AC）测试电流信号并测量所得到的AC电压信号的幅度来检测现场设备的端子块区域中的流体的存在。 现场设备包括第一终端和适于通过双绞线对电流环路连接到控制室的第二终端。 通过在第一端子和第二端子之间存在流体来增加电流回路的阻抗。 通过向控制回路提供AC测试电流信号并测量所得到的AC电压幅度，可以确定控制回路的阻抗。 控制回路中增加的阻抗表示端子块中存在水。

公开(公告)号：US20080156090A1

公开(公告)日：2008-07-03

申请号：US11648198

申请日：2006-12-28

Applicant: David L. Wehrs

Inventor： David L. Wehrs

IPC: G01F23/00

CPC classification number: G01M3/16 ,  G01M3/40 ,  H05K7/1462

Abstract: A field device detects the presence of fluid in the terminal block area of the field device by generating an alternating current (AC) test current signal and measuring the amplitude of the resulting AC voltage signal. The field device includes a first terminal and a second terminal adapted for connection to a control room through a twisted-wire pair current loop. Impedance of the current loop is increased by the presence of fluid between the first terminal and the second terminal. By providing an AC test current signal to the control loop and measuring a resulting AC voltage magnitude, the impedance of the control loop can be determined. Increased impedance in the control loop indicates the presence of water in the terminal block.

Abstract translation: 现场设备通过产生交流（AC）测试电流信号并测量所得到的AC电压信号的幅度来检测现场设备的端子块区域中的流体的存在。 现场设备包括第一终端和适于通过双绞线对电流环路连接到控制室的第二终端。 通过在第一端子和第二端子之间存在流体来增加电流回路的阻抗。 通过向控制回路提供AC测试电流信号并测量所得到的AC电压幅度，可以确定控制回路的阻抗。 控制回路中增加的阻抗表示端子块中存在水。

公开(公告)号：US20120222494A1

公开(公告)日：2012-09-06

申请号：US13039698

申请日：2011-03-03

Applicant: David L. Wehrs ,  John P. Miller ,  Andrew J. Klosinski

Inventor： David L. Wehrs ,  John P. Miller ,  Andrew J. Klosinski

IPC: G01F1/37

CPC classification number: G01F1/36 ,  G01F1/50 ,  G01F25/0007

Abstract: A system for measuring flow of process fluid through process piping in an industrial process includes a flow restriction element in the process pipe. A first differential pressure transmitter is configured to measure a first differential pressure across the flow restriction element in response to flow of process fluid. A second differential pressure transmitter configured to measure a second differential pressure in the process fluid across the flow restriction element. Circuitry performs diagnostics based upon the first differential pressure and the second differential pressure.

Abstract translation: 用于测量在工业过程中通过工艺管道的工艺流体流动的系统包括处理管中的流动限制元件。 第一差压变送器构造成响应于过程流体的流动来测量横跨流量限制元件的第一差压。 第二差压变送器被配置为测量横跨流量限制元件的过程流体中的第二差压。 电路根据第一差压和第二压差执行诊断。

公开(公告)号：US07996161B2

公开(公告)日：2011-08-09

申请号：US12323863

申请日：2008-11-26

Applicant: Andrew J. Klosinski ,  Gregory J. LeCuyer ,  Dale H. Perry ,  David L. Wehrs ,  Steve VanderSanden

Inventor： Andrew J. Klosinski ,  Gregory J. LeCuyer ,  Dale H. Perry ,  David L. Wehrs ,  Steve VanderSanden

IPC: G01L11/00 ,  G06F17/00

CPC classification number: G01L19/00

Abstract: A process fluid pressure transmitter includes a process fluid pressure sensor, measurement circuitry, a controller and a loop communicator. The pressure sensor is coupleable to a source of process fluid pressure. Measurement circuitry is coupled to the process fluid pressure sensor and provides a signal indicative of the electrical characteristic of the process fluid pressure sensor. The controller receives the signal from the measurement circuitry and calculates a process fluid pressure based at least in part upon the signal. The controller is also configured to detect a process fluid pressure transient and store at least one parameter related to the process fluid pressure transient. The loop communicator is coupled to the controller and is configured to provide a signal over a process communication loop based upon the process fluid pressure. The process fluid pressure transmitter is also configured to provide an indication related to the at least one stored parameter.

Abstract translation: 过程流体压力变送器包括过程流体压力传感器，测量电路，控制器和回路通信器。 压力传感器可与过程流体压力源连接。 测量电路耦合到过程流体压力传感器并且提供指示过程流体压力传感器的电特性的信号。 控制器接收来自测量电路的信号，并且至少部分地基于该信号来计算过程流体压力。 控制器还被配置为检测过程流体压力瞬态并存储与过程流体压力瞬态相关的至少一个参数。 环路通信器耦合到控制器，并且被配置为基于过程流体压力在过程通信回路上提供信号。 过程流体压力变送器还被配置为提供与至少一个存储的参数有关的指示。