Apparatus for detecting and controlling the level of a gaseous fluid
    1.
    发明授权
    Apparatus for detecting and controlling the level of a gaseous fluid 失效
    用于检测和控制气态流体水平的装置

    公开(公告)号:US4673927A

    公开(公告)日:1987-06-16

    申请号:US791487

    申请日:1985-10-25

    摘要: An apparatus for detecting and controlling the presence of a gaseous fluid in relation to a predetermined level of liquid in a vessel, being of the ultrasonic type and comprising a pair of piezoelectric transducers, namely a transmitter and a receiver, capable of being disposed on opposite walls of the vessel. An oscillator provides an electric ultrasonic frequency signal to the transmitter transducer and a comparator compares the electric signal supplied by the receiver transducer with a reference signal for triggering an alarm signal when the disparity between the signals being compared exceeds a predetermined value.The apparatus moreover comprises processing means which periodically interrupt the electric signal sent to the transmitter transducer and which check the presence of an alarm at the output of the above mentioned comparator.

    摘要翻译: 一种用于检测和控制气体流体相对于容器中的预定液位的存在的装置,其是超声波类型并且包括一对压电换能器,即发射器和接收器,其能够布置在相对的位置上 船只的墙壁。 振荡器向发射机传感器提供电超声波频率信号,并且比较器将由接收器换能器提供的电信号与参考信号进行比较,当参比信号之间的视差超过预定值时触发报警信号。 该装置还包括处理装置,其周期性地中断发送到发射机转换器的电信号,并且在上述比较器的输出端检查警报的存在。