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128 条记录 (耗时 0.018 秒)

    Control systems
    1.
    发明授权
    Control systems 失效
    控制系统

    公开(公告)号：US3697768A

    公开(公告)日：1972-10-10

    申请号：US3697768D

    申请日：1971-02-10

    申请人： ROSEMOUNT ENG CO LTD

    发明人： JOHNSTON JAMES STEWART

    IPC分类号： G05B11/32 ,  G05D23/22 ,  H02J1/00

    CPC分类号： G05B11/32 ,  G05D23/1909 ,  G05D23/22 ,  Y10T307/406

    摘要： A multi-point control system suitable for applications where a large number of processes, typically in excess of 100, are all required to be stabilized at the same operating conditions. The control system comprises on-off controllers fed with a common set-point signal. The controllers being adapted to function as time-proportional controllers by the perturbation of either the set-point signal or the process parameter signal by a periodic waveform. Other signals may be combined with the perturbing signal to provide, for example, compensation for a fluctuating power supply, or for environmental conditions affecting the deviations at the inputs of controllers. Such a system has economical advantages and by slight modifications to the controllers, the system can be used for differing applications.

    摘要翻译： 适用于大量工艺（通常超过100个）的多点控制系统都需要在相同的工作条件下稳定。 控制系统包括馈送有公共设定点信号的开关控制器。 控制器适用于通过周期性波形扰动设定点信号或过程参数信号作为时间比例控制器。 其他信号可以与扰动信号组合以提供例如对波动电源的补偿，或者影响影响控制器输入端的偏差的环境条件。 这种系统具有经济的优点并且通过对控制器的轻微修改，该系统可以用于不同的应用。

    Linearized resistance bridge circuit operable in plurality from a common power supply
    2.
    发明授权
    Linearized resistance bridge circuit operable in plurality from a common power supply 失效
    线性化电阻桥式电路可在普通电源中运行

    公开(公告)号：US3651696A

    公开(公告)日：1972-03-28

    申请号：US3651696D

    申请日：1969-07-15

    申请人： ROSEMOUNT ENG CO LTD

    发明人： ROSE ROBERT C

    IPC分类号： G01R17/16 ,  G01K7/20 ,  G01K7/21 ,  G01R17/10

    CPC分类号： G01R17/105 ,  G01K7/21

    摘要： A bridge circuit suitable for platinum resistance thermometers having three lead wires. An operational amplifier varies the bridge excitation current in response to the bridge output to effect a desired degree of linearization or curve shaping between the sensing resistance and bridge output. The output is referenced to ground and a plurality of such bridges may be operated from a common power supply having a ground tap thus providing a flexible measuring system suitable for multipoint, continuous or scanning operations.

    摘要翻译： 适用于具有三根引线的铂电阻温度计的桥接电路。 运算放大器响应于桥式输出来改变桥式励磁电流，以实现感测电阻和桥式输出之间所需的线性化或曲线整形。 输出参考地面，并且可以从具有接地抽头的公共电源操作多个这样的桥，从而提供适合于多点，连续或扫描操作的灵活的测量系统。

    Transducer circuitry for converting a capacitance signal to a dc current signal
    3.
    发明授权
    Transducer circuitry for converting a capacitance signal to a dc current signal 失效
    用于将电容信号转换为直流电流信号的传感器电路

    公开(公告)号：US3646538A

    公开(公告)日：1972-02-29

    申请号：US3646538D

    申请日：1969-10-27

    申请人： ROSEMOUNT ENG CO LTD

    发明人： FRICK ROGER L

    IPC分类号： G01R27/26 ,  G08C19/02 ,  G08C19/10

    CPC分类号： G08C19/10

    摘要： The circuitry including the variable capacitance sensor is excited by an external DC power source. A portion of the direct current power is converted to a high-frequency alternating current which is in circuit with the capacitance sensor and individual rectifying means for each of the capacitances. The rectified currents from the capacitances are compared to a reference current and the resulting signal together with a measure of all the other direct currents used by the circuit provide a signal to control the total current supplied to the circuitry. The total current then bears a prescribed and dependent relation to the capacitance of the sensor. The rectifying means form separate rectifying loops each of which is driven by an AC excitation winding. These rectifying loops are used in a special circuit configuration with a capacitance pressure sensor to provide a highly linear output signal as a function of differential pressure.

    Redundant system
    4.
    发明授权
    Redundant system 失效
    冗余系统

    公开(公告)号：US3614401A

    公开(公告)日：1971-10-19

    申请号：US3614401D

    申请日：1969-04-01

    申请人： ROSEMOUNT ENG CO LTD

    发明人： LODE TENNY D

    IPC分类号： G05D1/00 ,  B64C13/00 ,  G06F11/00 ,  G08C25/00

    CPC分类号： G05D1/0077

    摘要： This disclosure shows several forms of multiple channel redundant signal transmission systems which are capable of continued operation in spite of failures of individual transmission elements or channel elements. The redundancy is applied to a multiple channel system as a whole, rather than to individual channels. For example, one additional channel may be used as a redundant backup for two, three or more individual channels to provide continued operation of all channels in spite of a failure in any single channel including the additional channel. The approach is believed to offer significant economics over the more conventional approach of providing separate redundant or backup channels for each individual signal channel.

    Two-wire current transmitter with transformer isolation
    6.
    发明授权
    Two-wire current transmitter with transformer isolation 失效
    具有变压器隔离的双线电流发射器

    公开(公告)号：US3573599A

    公开(公告)日：1971-04-06

    申请号：US3573599D

    申请日：1969-10-27

    申请人： ROSEMOUNT ENG CO LTD

    发明人： ROSE ROBERT C

    IPC分类号： G01K1/02 ,  G01K7/02 ,  G08C19/02 ,  H02M3/28

    CPC分类号： G08C19/02 ,  G01K1/024 ,  G01K7/021

    摘要： A transmitter controls the flow of DC load current through two wires in accordance with the magnitude of a DC voltage representative of a variable condition. Transformer coupling is used to isolate the load side from the sensing side. This permits a thermocouple to be employed, where the variable condition is temperature, and to be freely grounded without adversely affecting the output or load current. Special DC/AC and AC/DC circuitry is included.