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    • 5. 发明授权
    • Apparatus for detecting a level of liquid
    • 用于检测液体水平的装置
    • US5369396A
    • 1994-11-29
    • US58590
    • 1993-05-07
    • Nobuo KurataHiroshi Tooyama
    • Nobuo KurataHiroshi Tooyama
    • F01M11/12G01F23/00G01F23/74H01H36/02G08B21/00
    • F01M11/12G01F23/0092G01F23/74H01H36/02F16N2250/08F16N2260/04
    • An apparatus for detecting a liquid level includes a warning device for warning a low liquid level, and a regulator for controlling power supply to the warning device from a power source. The regulator comprises a switch for switching its condition in accordance with the liquid level. The ON condition of the switch indicates that the present liquid level is lower than a predetermined liquid level. The regulator further comprises a thermistor connected to the switch in series. The thermistor has a characteristic of decreasing the resistance value thereof, when a predetermined delay period of time as a function of atmospheric temperature has elapsed since the start of applying the voltage on the thermistor, synchronizing with turning the switch on. The low resistance value of the thermistor allows the power for activating the warning device to be supplied to its device, while the switch is turned on.
    • 用于检测液位的装置包括用于警告低液位的警告装置和用于从电源控制对警告装置的电力供应的调节器。 调节器包括用于根据液位切换其状态的开关。 开关的ON状态表示本液位低于规定液面。 调节器还包括串联连接到开关的热敏电阻。 热敏电阻具有降低其电阻值的特性,当从开始施加电压到热敏电阻上开始经过了作为大气温度的函数的预定延迟时间段时,与打开开关同步。 当开关打开时,热敏电阻的低电阻值允许启动报警装置的电源供应到其装置。