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    • 1. 发明授权
    • Liquid level gauging apparatus
    • 液位计测量仪
    • US3911744A
    • 1975-10-14
    • US45957474
    • 1974-04-10
    • LIQUIDOMETER CORP
    • EDWARDS HARRISON F
    • G01F23/24
    • G01F23/241
    • A liquid level gauge which utilizes the electrical resistance of the liquid being gauged to provide readings. An immersion unit is adapted to be disposed vertically in the liquid storage vessel. It comprises an elongate conducting member coextensive with a row of insulatedly-mounted electrodes which latter are individually connected to an indicating type selector switch means. The conducting member is connected to one input of an extremely sensitive electronic amplifier, which in turn drives an output indicating meter. The indicating selector switch means can apply an exciting potential to any of the electrodes, which results in a driving signal applied to the amplifier only if the excited electrode is submerged. An indicator light signals the amplifier output under such circumstances. By sweeping the selector switch means over its range and noting the point at which the indicator light becomes illuminated, it is possible to ascertain the location of the upper-most electrode which is submerged and thus determine the level of fluid in the tank. In addition, the indicating meter provides a reading corresponding to the percentage or portion of the electrode which is submerged, and thus gives a finer degree of accuracy to the level measurement.
    • 液位计利用被测量的液体的电阻来提供读数。 浸渍单元适于垂直地设置在液体储存容器中。 它包括与一排绝缘安装的电极共同延伸的细长导电构件,后者分别连接到指示型选择器开关装置。 导电构件连接到极敏感的电子放大器的一个输入端,其继而驱动输出指示仪表。 指示选择器开关装置可以向任何电极施加激发电位,这导致仅当激发电极被浸没时才向放大器施加驱动信号。 在这种情况下,指示灯会指示放大器输出。