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    • 81. 发明授权
    • Non-symmetrical overload protection device for differential pressure
transmitter
    • 用于差压变送器的非对称过载保护装置
    • US4285244A
    • 1981-08-25
    • US121033
    • 1980-02-13
    • Norman E. Green
    • Norman E. Green
    • G01L13/06G01L13/00G01L13/02G01L19/06G08C23/00G01L9/00
    • G01L19/0618G01L13/025G01L19/0645
    • A differential pressure to electrical signal transmitter has a pair of barrier diaphragms and a central control diaphragm located between the barrier diaphragms. Input fluids are applied to respective chambers on the outside of the barrier diaphragms while the chambers between the control diaphragm and the barrier diaphragm are filled by corresponding substantially incompressible fill liquids. The fluid pressure of the two fill fluids are conducted by corresponding fluid channels to respective sides of a displacement sensing element to produce an electrical signal representative of differential pressure. The control diaphragm is biased by spring loaded spacers located on corresponding sides of the control diaphragm. The spacers have fluid passages to permit the respective fill fluids to reach the control diaphragm. A first spacer is concentric with a first chamber on a first side of the control diaphragm while a second spacer is concentric with a second chamber having a smaller diameter than the first chamber and being located on the other side of the control diaphragm. Consequently, the second spacer overlies the peripheral edge of the first chamber to produce a differential input fluid pressure overload response correlated to a non-symmetrical ratio of the directional strength of the displacement sensing element.
    • 对电信号发射器的差压具有一对屏障隔膜和位于阻挡隔膜之间的中央控制膜。 输入流体被施加到屏障隔膜的外侧上的各个腔室,而控制膜片和阻挡膜片之间的腔室被相应的基本上不可压缩的填充液体填充。 两个填充流体的流体压力通过相应的流体通道传导到位移感测元件的相应侧面,以产生表示差压的电信号。 控制膜片由位于控制膜片相应侧面上的弹簧加载间隔件偏压。 间隔物具有流体通道以允许相应的填充流体到达控制膜片。 第一间隔件与控制膜片的第一侧上的第一室同心,而第二间隔件与具有比第一室小的直径的第二室同心并位于控制膜片的另一侧。 因此,第二隔离物覆盖第一室的周边边缘,以产生与位移感测元件的方向强度的非对称比关联的差分输入流体压力过载响应。
    • 82. 发明授权
    • Mechano-optical digital position-indicating system with vernier reading
    • 机械光学数字位置指示系统与VERNIER阅读
    • US3820096A
    • 1974-06-25
    • US35485473
    • 1973-04-26
    • SCHNEIDER CO OPTISCHE WERKE
    • HIMMELSBACH PFALLER W
    • G01D5/26G01D5/249G01D5/347G01D5/353G01D5/36G08C19/36G08C19/30G08C23/00
    • G01D5/347
    • A code carrier with several parallel tracks moves past a first reading head which feeds a digital indicator, through several bundles of light-conductive filaments assigned to respective digital positions, in accordance with transparent or reflective code markings on associated tracks of the carrier which is coupled with a measuring bar for joint movement therewith. The code markings on the carrier tracks define a multiplicity of unit steps giving a coarse reading of the measured value. The measuring bar is provided with light-transmissive graduations whose spacing corresponds to the unit steps and which are optically projected onto a receiving surface together with a reference mark from a slider coupled, through a step-down transmission, with a rotatable control disk having several concentric code tracks. The slider, which may be rigid with the first reading head, has a stroke length just short of a unit step so as to give a vernier measurement, in terms of supplemental digits, with the aid of a second reading head which scans the code tracks of the control disk and feeds the digital indicator through additional bundles of light-conductive filaments in accordance with the disk position in which the projected reference mark coincides with one of the graduations of the measuring bar as projected upon the receiving surface.