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公开(公告)号：US08448525B2
公开(公告)日：2013-05-28
申请号：US13039698
申请日：2011-03-03
IPC分类号： G01F1/37
CPC分类号： G01F1/36 , G01F1/50 , G01F25/0007
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US20120222494A1
公开(公告)日：2012-09-06
申请号：US13039698
申请日：2011-03-03
IPC分类号： G01F1/37
CPC分类号： G01F1/36 , G01F1/50 , G01F25/0007
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US07996161B2
公开(公告)日：2011-08-09
申请号：US12323863
申请日：2008-11-26
CPC分类号： G01L19/00
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US20090139346A1
公开(公告)日：2009-06-04
申请号：US12323863
申请日：2008-11-26
CPC分类号： G01L19/00
摘要： A process fluid pressure transmitter includes a process fluid pressure sensor, measurement circuitry, a controller and a loop communicator. The process fluid pressure sensor has an electrical characteristic that varies with process fluid pressure. The pressure sensor is coupleable to a source of process fluid pressure. The 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 is coupled to the measurement circuitry and receives the signal 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.
摘要翻译： 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。 过程流体压力传感器具有随过程流体压力而变化的电特性。 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。 控制器耦合到测量电路并且接收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。
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公开(公告)号：US08290721B2
公开(公告)日：2012-10-16
申请号：US11503878
申请日：2006-08-14
申请人： David L. Wehrs , Evren Eryurek
发明人： David L. Wehrs , Evren Eryurek
CPC分类号： G01F25/0007 , G01F15/00
摘要： 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.
摘要翻译： 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。
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6.发明授权公开(公告)号：US07521944B2
公开(公告)日：2009-04-21
申请号：US11648198
申请日：2006-12-28
申请人： David L. Wehrs
发明人： David L. Wehrs
CPC分类号： G01M3/16 , G01M3/40 , H05K7/1462
摘要： 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.
摘要翻译： 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。
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7.发明申请公开(公告)号：US20080156090A1
公开(公告)日：2008-07-03
申请号：US11648198
申请日：2006-12-28
申请人： David L. Wehrs
发明人： David L. Wehrs
IPC分类号： G01F23/00
CPC分类号： G01M3/16 , G01M3/40 , H05K7/1462
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US07659828B2
公开(公告)日：2010-02-09
申请号：US11507356
申请日：2006-08-21
IPC分类号： G08B21/00
CPC分类号： G01N33/2823 , G01F1/666 , G01F1/74 , G01N29/046 , G01N2291/02836 , G01P13/0006 , G01V1/28
摘要： An industrial field device provides information indicative of a process variable. The field device includes a controller, communication circuitry, a process variable sensor and measurement circuitry. The communication circuitry is coupled to the controller. The process variable sensor has an electrical characteristic that changes based on a variable of a process fluid. The measurement circuitry is coupled to the process variable sensor and coupled to the controller. The controller is configured to generate communication via the communication circuitry relative to the process variable, and to provide an indication of sand flow or other solids in the fluid.
摘要翻译： 工业现场设备提供指示过程变量的信息。 现场设备包括控制器，通信电路，过程变量传感器和测量电路。 通信电路耦合到控制器。 过程变量传感器具有基于过程流体的变量而变化的电特性。 测量电路耦合到过程变量传感器并耦合到控制器。 控制器被配置为经由通信电路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。
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公开(公告)号：US4598251A
公开(公告)日：1986-07-01
申请号：US645835
申请日：1984-08-31
申请人： David L. Wehrs
发明人： David L. Wehrs
摘要： A circuit (10) receives a cyclic input signal having a frequency determined by a source (11), which frequency may vary in accordance with a parameter or condition to be measured, for example. The circuit (10) very precisely provides an output current representative of the frequency of the input signal. In particular, the circuit uses a pair of regulated and different voltage (16)(17), one (16) of which is impressed upon an averaging circuit (30) for a preselected time during each cycle of the input signal, and the other voltage (17) is impressed upon the averaging circuit (30) during the time when the first signal is not connected to the averaging circuit. A control signal (V.sub.o) is developed from the averaging circuit (30) which is a function of the average of the voltage provided to the averaging circuit, and the control signal (V.sub.o) in turn is used for controlling a current control amplifier (60) and transistors (61)(62) which in turn control current flow through a load (40) connected to output terminals (36)(37) and through a feedback resistor (63). The use of regulated voltage sources (16)(17) for deriving the current control signal insures great stability, relatively low cost, and precise operation.
摘要翻译： 电路（10）接收具有由源（11）确定的频率的循环输入信号，该频率可以根据例如待测量的参数或条件而变化。 电路（10）非常精确地提供表示输入信号频率的输出电流。 特别地，该电路使用一对调节和不同的电压（16）（17），其中一个（16）在输入信号的每个周期期间被预先选定的时间施加在平均电路（30）上，而另一个 在第一信号未连接到平均电路的时间期间，电平（17）施加在平均电路（30）上。 从作为提供给平均电路的电压的平均值的函数的平均电路（30）产生控制信号（Vo），控制信号（Vo）又用于控制电流控制放大器 ）和晶体管（61）（62），其又控制电流流过连接到输出端子（36）（37）的负载（40）并通过反馈电阻器（63）。 使用用于导出电流控制信号的稳压电源（16）（17）可确保极大的稳定性，相对较低的成本和精确的操作。
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10.发明授权Process variable transmitter with two-wire process control loop diagnostics 有权具有二线过程控制回路诊断功能的过程变量变送器公开(公告)号：US09182256B2
公开(公告)日：2015-11-10
申请号：US12832341
申请日：2010-07-08
CPC分类号： G01D21/00 , G05B19/0423 , G05B2219/24069
摘要： 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.
摘要翻译： 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。
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