公开(公告)号：US06594613B1

公开(公告)日：2003-07-15

申请号：US09209134

申请日：1998-12-10

申请人： Kevin Ley ,  David C. Bohn ,  David L. Wehrs

发明人： Kevin Ley ,  David C. Bohn ,  David L. Wehrs

IPC分类号： H04B1500

CPC分类号： G01D3/032 ,  G01D3/0365 ,  G01F1/58 ,  G01F25/0007

摘要： 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.

摘要翻译： 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：US4741215A

公开(公告)日：1988-05-03

申请号：US39821

申请日：1987-04-15

申请人： David C. Bohn ,  Lloyd E. Graupmann

发明人： David C. Bohn ,  Lloyd E. Graupmann

IPC分类号： G01F1/58

CPC分类号： G01F1/588

摘要： A flow tube of a ceramic material used for a magnetic flowmeter is formed to have regions of a ceramic material which has enhanced properties useful in magnetic flowmeters, such as enhanced electrical conductivity or enhanced magnetic permeability. The ceramic material having enhanced electrical conductivity is used to form sensing surfaces directly in the flow tube wall so that there is no need to have separate metal electrodes attached to or otherwise formed in the wall of the flow tube. This insures a strong, monolithic flow tube wall.

摘要翻译： 用于磁流量计的陶瓷材料的流管形成为具有可用于磁流量计的增强性能的陶瓷材料的区域，例如增强的导电性或增强的磁导率。 具有增强的导电性的陶瓷材料用于直接在流动管壁中形成感测表面，使得不需要在流管的壁上附接或以其他方式形成分离的金属电极。 这确保了一个坚固的，整体的流动管壁。

公开(公告)号：US4503711A

公开(公告)日：1985-03-12

申请号：US537973

申请日：1983-09-30

申请人： David C. Bohn

发明人： David C. Bohn

IPC分类号： G01F1/58

CPC分类号： G01F1/58

摘要： A travelling wave magnetic flowmeter senses the velocity of flow of an electrically conductive fluid through a conduit and provides an output signal representative of the velocity of flow. A first pair of coils providing a first magnetic field and a second pair of coils providing a second magnetic field are disposed on the conduit. The first and second magnetic fields are varied in strength and at least partially combined to form a travelling composite magnetic field, a portion of which interacts with the fluid to induce an electromotive force. A pair of electrodes are electrically isolated from the conduit and disposed in the conduit between the first and second coils. The electrodes are electrically coupled to the fluid to provide a detected signal representative of the electromotive force. A control circuit coupled to the first and second coils and coupled to the electrodes to receive the detected signal, controls an electrical current shifted between the first coils and the second coils such that the travelling composite magnetic field travels in the direction of fluid flow at a speed representative of the fluid velocity.

摘要翻译： 行波磁流量计感测通过导管的导电流体的流速，并提供代表流速的输出信号。 提供第一磁场的第一对线圈和提供第二磁场的第二对线圈设置在导管上。 第一和第二磁场强度变化并且至少部分组合以形成行进的复合磁场，其一部分与流体相互作用以引起电动势。 一对电极与导管电隔离并且设置在第一和第二线圈之间的导管中。 电极电耦合到流体以提供表示电动势的检测信号。 耦合到第一和第二线圈并耦合到电极以接收检测到的信号的控制电路控制在第一线圈和第二线圈之间移动的电流，使得行进的复合磁场在流体流动的方向上行进 速度代表流体速度。

公开(公告)号：US4459857A

公开(公告)日：1984-07-17

申请号：US388953

申请日：1982-06-16

申请人： Jean P. Murray ,  David C. Bohn ,  Darroll D. Bengtson

发明人： Jean P. Murray ,  David C. Bohn ,  Darroll D. Bengtson

IPC分类号： G01F1/58

CPC分类号： G01F1/58

摘要： An electromagnetic flowmeter for measuring the flow of an electrically conductive fluid through a flow system comprises a flow tube adapted to be connected in the flow system for allowing the fluid to flow therethrough. Coils supported by the flow tube are energized to provide magnetomotive force to produce a magnetic field, a portion of which interacts with the fluid to produce an electric field within the fluid. Electrodes supported by the flow tube receive signals from the electric field representative of flow. The electrodes are coupled to a signal processing circuit which processes the signals and transmits an output signal representative of flow to suitable readout equipment. At least one magnetomotive force adjusting means, such as a plurality of coil taps or connections that permit changing the number of energized turns in the coils allow selection of a desired magnitude of magnetomotive force to set the magnitude of the magnetic field such that signal variations resulting from manufacturing tolerances of the flow tube, coils and electrodes are substantially compensated for and the signals received by the electrodes are compatible with a calibration range of the signal processing circuit.

摘要翻译： 用于测量通过流动系统的导电流体的流动的电磁流量计包括适于在流动系统中连接以允许流体流过其中的流动管。 由流管支撑的线圈被激励以提供磁动势以产生磁场，其一部分与流体相互作用以在流体内产生电场。 由流管支撑的电极从代表流动的电场接收信号。 电极耦合到处理信号的信号处理电路，并将代表流的输出信号传送到合适的读出设备。 至少一个磁动势调节装置，例如允许改变线圈中的通电匝数的多个线圈抽头或连接件允许选择所需的磁动势强度以设定磁场的大小，从而导致信号变化 从流管的制造公差，线圈和电极基本上被补偿，并且由电极接收的信号与信号处理电路的校准范围兼容。