Detecting liquid dry conditions for liquefied compressed gases
    3.
    发明授权
    Detecting liquid dry conditions for liquefied compressed gases 有权
    检测液化气体的液体干燥条件

    公开(公告)号:US06742282B2

    公开(公告)日:2004-06-01

    申请号:US10300477

    申请日:2002-11-20

    Abstract: A method and an apparatus are disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The apparatus includes a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, said substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. The preferred embodiment includes a third sensor for sensing ambient temperature (Ta) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.

    Abstract translation: 公开了一种方法和装置,用于在含有液化压缩气体的容器中检测液体干燥状况的发生,同时液化压缩气体的气相随着时间从容器中移出。 该装置包括第一传感器,第二传感器和计算机,优选地是编程逻辑控制器(PLC)。 第一传感器感测容器内的温度(T),并提供指示其的信号。 第二传感器感测容器内的压力(P)并提供指示其的信号。 计算机接收来自第一和第二传感器的信号,并确定容器内的压力(dP / dt)和温度(dT / dt)随时间变化的速率。 计算机识别容器内的温度变化率(dT / dt)的突然增加的发生,以及容器内部的压力变化率(dP / dt)的显着同时出现 所述基本上同时发生的事件表明在容器中出现液体干燥状况。 优选实施例包括用于感测环境温度(Ta)并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号,并且在确定容器内的温度变化率(dT / dt)随时间变化时,考虑到环境温度的变化。

    Detecting liquid dry conditions for liquified compressed gases
    4.
    发明授权
    Detecting liquid dry conditions for liquified compressed gases 失效
    检测液化干燥条件下的液化压缩气体

    公开(公告)号:US06643951B1

    公开(公告)日:2003-11-11

    申请号:US09694199

    申请日:2000-10-23

    Abstract: A method and an apparatus are disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The apparatus includes a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, said substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. The preferred embodiment includes a third sensor for sensing ambient temperature (Ta) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.

    Abstract translation: 公开了一种用于检测在含有液化压缩气体的容器中液体干燥状况的发生的方法和装置,同时液化压缩气体的气相随着时间从容器中移出。 该装置包括第一传感器,第二传感器和计算机,优选地是编程逻辑控制器(PLC)。 第一传感器感测容器内的温度(T),并提供指示其的信号。 第二传感器感测容器内的压力(P)并提供指示其的信号。 计算机接收来自第一和第二传感器的信号,并确定容器内的压力(dP / dt)和温度(dT / dt)随时间变化的速率。 计算机识别容器内的温度变化率(dT / dt)的突然增加的发生,以及容器内部的压力变化率(dP / dt)的显着同时出现 所述基本上同时发生的事件表明在容器中出现液体干燥状况。 优选实施例包括用于感测环境温度(Ta)并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号,并且在确定容器内的温度变化率(dT / dt)随时间变化时,考虑到环境温度的变化。

    Detecting liquid dry conditions for liquefied compressed gases
    5.
    发明授权
    Detecting liquid dry conditions for liquefied compressed gases 失效
    检测液化气体的液体干燥条件

    公开(公告)号:US6134805A

    公开(公告)日:2000-10-24

    申请号:US138498

    申请日:1998-08-24

    Abstract: A method [and an apparatus are] is disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The [apparatus includes] method uses a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, [said] substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. [The preferred embodiment includes a third sensor for sensing ambient temperature (T.sub.a) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.]

    Abstract translation: 公开了一种用于检测在含有液化压缩气体的容器中液体干燥状况的发生同时液体压缩气体的气相随时间从容器中移出的方法[和装置]。 [装置包括]方法使用第一传感器,第二传感器和计算机,优选地是编程逻辑控制器(PLC)。 第一传感器感测容器内的温度(T),并提供指示其的信号。 第二传感器感测容器内的压力(P)并提供指示其的信号。 计算机接收来自第一和第二传感器的信号,并确定容器内的压力(dP / dt)和温度(dT / dt)随时间变化的速率。 计算机识别容器内的温度变化率(dT / dt)的突然增加的发生,以及容器内部的压力变化率(dP / dt)的显着同时出现 ,表示在容器中出现液体干燥状态的基本上同时发生的事件。 [优选实施例包括用于感测环境温度(Ta)并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号,并且在确定容器内的温度变化率(dT / dt)随时间变化时,考虑到环境温度的变化。

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