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184 条记录 (耗时 0.061 秒)

    Housing for a process controller
    3.
    发明授权
    Housing for a process controller 失效
    过程控制器的外壳

    公开(公告)号：US5010322A

    公开(公告)日：1991-04-23

    申请号：US287734

    申请日：1988-12-21

    申请人： John J. Fry ,  George R. Hall, II ,  Robert A. Smith

    发明人： John J. Fry ,  George R. Hall, II ,  Robert A. Smith

    IPC分类号： F23N1/02 ,  F23N5/00 ,  F23N5/24

    CPC分类号： F23N5/242 ,  F23N1/02 ,  F23N2023/04 ,  F23N2023/08 ,  F23N2023/38 ,  F23N2031/20 ,  F23N5/003 ,  F23N5/006 ,  G05B2219/24063 ,  G05B2219/24103

    摘要： A combustion control system includes a sensor assembly and a process controller, the sensor assembly including sensors for providing output signals indicative of process variables, the process controller responding to the output signals to maintain a desired operation of the process. The process controller continuously monitors parameters of the sensors and provides alarms whenever any of these parameters deviate from setpoint values, the process controller automatically prioritizing these alarms to provide a display of only the most relevant alarms. A housing enclosing the process controller provides EMI/RFI shielding of the process controller including the attenuation and absorption of the EMI/RFI energy.

    摘要翻译： 燃烧控制系统包括传感器组件和过程控制器，传感器组件包括用于提供指示过程变量的输出信号的传感器，过程控制器响应输出信号以维持过程的期望操作。 过程控制器连续监控传感器的参数，并在任何一个参数偏离设定值时提供报警，过程控制器自动对这些报警进行优先排序，以提供仅显示最相关的报警。 封闭过程控制器的外壳提供过程控制器的EMI / RFI屏蔽，包括EMI / RFI能量的衰减和吸收。

    Apparatus for measuring differential impedances
    5.
    发明授权
    Apparatus for measuring differential impedances 失效
    差分阻抗测量装置

    公开(公告)号：US4837501A

    公开(公告)日：1989-06-06

    申请号：US93432

    申请日：1987-09-04

    申请人： John J. Fry ,  Robert A. Smith

    发明人： John J. Fry ,  Robert A. Smith

    IPC分类号： G01D5/22

    CPC分类号： G01D5/22

    摘要： An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.

    摘要翻译： 一种用于测量差分阻抗的装置，其中采用CMOS定时器代替典型的AC桥结构中的正弦波发生器。 一个环形信号变压器，其初级和次级绕组紧紧地绞在一起并围绕磁芯缠绕，可以降低温度漂移特性。 由次级绕组提供的差分双极性电流信号通过由场效应晶体管切换的AC至DC转换器，从而不需要现有技术的逆变器比较器电路。 最后，通过在信号变压器之后使用带通滤波器并且在AC到DC转换器之前插入电容器，消除了对现有技术中使用的有源滤波器级的需要。

    Apparatus for measuring differential impedances
    7.
    发明授权
    Apparatus for measuring differential impedances 失效
    差分阻抗测量装置

    公开(公告)号：US5068618A

    公开(公告)日：1991-11-26

    申请号：US568660

    申请日：1990-08-15

    申请人： John J. Fry ,  Robert A. Smith

    发明人： John J. Fry ,  Robert A. Smith

    IPC分类号： G01D5/22

    CPC分类号： G01D5/22

    摘要： An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.

    摘要翻译： 一种用于测量差分阻抗的装置，其中采用CMOS定时器代替典型的AC桥结构中的正弦波发生器。 一个环形信号变压器，其初级和次级绕组紧紧地绞在一起并围绕磁芯缠绕，可以降低温度漂移特性。 由次级绕组提供的差分双极性电流信号通过由场效应晶体管切换的AC至DC转换器，从而不需要现有技术的逆变器比较器电路。 最后，通过在信号变压器之后使用带通滤波器并且在AC到DC转换器之前插入电容器，消除了对现有技术中使用的有源滤波器级的需要。