公开(公告)号：US4745543A

公开(公告)日：1988-05-17

申请号：US56363

申请日：1987-05-28

申请人： Robert Michener ,  Thomas Frederiksen, Jr.

发明人： Robert Michener ,  Thomas Frederiksen, Jr.

IPC分类号： G01R13/40 ,  G05B11/01 ,  G06F3/14

CPC分类号： G05B11/01 ,  G01R13/405 ,  G01R13/406

摘要： A front display panel for an industrial process control instrument which acts to maintain a process variable, such as flow rate, at a desired value. The instrument compares a signal representing the variable with an adjustable set point to produce an output signal that reflects the deviation of the variable from the set point, the output signal being applied to a final control element such as a valve which governs the process variable. The front panel of the instrument includes a bar graph indicator for the process variable, a bar graph indicator for the set point and a bar graph indicator for the output signal, all three indicators being of the gas discharge type and being integrated into a single panel defining a sealed envelope filled with an ionizable gas and provided with electrodes. Also integrated into the panel are touch-sensitive switches and other control and indicating elements.

摘要翻译： 用于工业过程控制仪器的前显示面板，其用于将过程变量（例如流速）维持在期望值。 仪器将表示变量的信号与可调节的设定点进行比较，以产生反映变量与设定点的偏差的输出信号，输出信号被施加到诸如控制过程变量的阀的最终控制元件。 仪器的前面板包括过程变量的条形图指示器，设定点的条形图指示器和输出信号的条形图指示器，所有三个指示器均为气体放电类型，并集成到单个面板 限定填充有可电离气体并设置有电极的密封的信封。 还集成在面板中的是触敏开关和其他控制和指示元件。