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。