Cryogenic liquid level measuring apparatus and probe therefor
    2.
    发明授权
    Cryogenic liquid level measuring apparatus and probe therefor 失效
    低温液位测量装置及探头

    公开(公告)号:US4020690A

    公开(公告)日:1977-05-03

    申请号:US615394

    申请日:1975-09-22

    CPC classification number: G01F23/16

    Abstract: Liquid level in a vessel of cryogenic liquid or solid-liquid slurry is determined and indicated by sensing, in an immersed tubular probe, a probe-evoked vapor gas pressure counter balancing the hydrostatic head to the probe tip, and displaying an output on an appropriate meter scale or by a digital readout device in level height or other vessel-content terms, and, if desired, activating a low level alarm; the probe as a heat pipe conducting heat, from a source external of the liquid, to the probe bore as far as the tip to volatilize liquid entering the probe tip from which as a sensing gas the gas phase may slowly bubble; a differential pressure sensing device being connected to the probe and to the vessel gas space for a closed vessel.The probe comprises a small-diameter copper sensing tube with bottom tip open to the liquid and top end connected to the pressure sensing device; and a sensing-tube-surrounding stainless steel tube as (at least at temperature of use) an insulating vacuum jacket, with certain structural expedients to accommodate differences in average thermal coefficients of linear expansion of the metals, to maintain the tubes generally coaxially spaced from contact under conditions, and to reduce heat transfer therebetween. Probe variations are given for use in the common method whereby liquid at the point of measurement will have a vapor pressure exceeding the static head.

    Abstract translation: 在低温液体或固液体浆液的容器中的液位被确定并通过在浸没的管状探针中感测探针诱发的蒸汽气体压力平衡来指示静水压头与探针尖端的平衡,并且以合适的方式显示输出 水平仪或水平高度或其他容器内容术语的数字读出装置,如果需要,启动低水平报警; 探针作为热管,从液体外部的源传导到探针孔至尖端,以使进入探针尖端的液体挥发,气体可以作为感测气体缓慢地起泡; 差压感测装置连接到探针和用于封闭容器的容器气体空间。

    Cryogenic controller device
    3.
    发明授权
    Cryogenic controller device 失效
    低温控制装置

    公开(公告)号:US3938554A

    公开(公告)日:1976-02-17

    申请号:US482338

    申请日:1974-06-24

    Abstract: A device providing gas-powered logic responsive to a sensor such as a gas discharging type level probe and actuating valving controlling flow of liquid to be dispensed; and adapted to valving either for a volatile, especially cryogenic liquid utilizing the liquid's vapor pressure from a free gas space in a storage vessel top region as a power source both for control function and for the liquid transfer through a valve to a receiver, or with use of a separate gas supply for powering the probe, logic and amplifier, valving which applies liquid transferring pressure to a free gas space of a source vessel or vents the same for liquid transfer cut off, for volatile or non-volatile liquid.

    Abstract translation: 提供响应于诸如气体放电型液位探测器的传感器的气体动力逻辑的装置,以及控制待分配液体流动的阀门; 并适用于利用来自储存容器顶部区域中的游离气体空间的液体的蒸气压作为动力来对挥发性特别是低温液体进行阀门,用于控制功能,以及通过阀向液体转移到接收器,或者用 对于挥发性或非挥发性液体,使用单独的气体供应源为探头,逻辑和放大器供电,阀将液体转移压力施加到源容器的自由气体空间或排出液体转移。

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