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    • 44. 发明授权
    • Level sensor system
    • 液位传感器系统
    • US4888989A
    • 1989-12-26
    • US833942
    • 1986-02-26
    • John C. Homer
    • John C. Homer
    • G21F9/04G01F23/26G21F9/22
    • G01F23/268G01F23/266
    • A level sensor system for liquids and liquid slurries utilizes a capacitive probe which extends longitudinally into a liquid or liquid slurry containing vessel, and which may contain inner and outer sensors spaced from each other in an assembly with a flow control screen at its lower end to permit egress of liquid and exclusion of the solid slurry material, thereby enabling both liquid and slurry level to be determined. The capacitance presented by each sensor is converted into a digital output in repetitive cycles having a reference phase, where a reference voltage is generated by charging a reference capacitor while a counter is registering counts and until a pre-determined count is reached, and in a computing phase while counts are accumulated until the capacitance presented by the probe charges to a voltage equal to the reference voltage. The counts registered in the counter may be converted into level units and displayed or the difference between the liquid and slurry levels may be used to control a fluid system, as in the de-watering of waste, ion exchange resins and other waste filter media and sludges used in decontamination, water treatment in nuclear power plants.
    • 用于液体和液体浆料的液位传感器系统利用电容式探头,其纵向延伸进入含液体或液体浆液的容器,并且其可包含内部和外部传感器,该组件中的内部和外部传感器在其下端具有流量控制屏幕 允许液体排出并排除固体浆料,从而使液体和浆液水平均能够确定。 每个传感器呈现的电容被转换成具有参考相位的重复循环中的数字输出,其中通过在计数器注册计数并直到达到预定计数时对参考电容器充电来产生参考电压,并且在 计算阶段,同时累加计数直到由探针呈现的电容充电到等于参考电压的电压。 记录在计数器中的计数可以转换成水平单位并显示,或者可以使用液体和浆料水平之间的差异来控制流体系统,如在废水,离子交换树脂和其它废物过滤介质的脱水中,以及 用于净化,污水处理的污泥在核电厂。