Method and system for sensing a liquid level

    公开(公告)号:US10295390B2

    公开(公告)日:2019-05-21

    申请号:US15549417

    申请日:2016-02-19

    IPC分类号: G01F23/26

    摘要: The present application relates to a system (10) for sensing liquid level in a receptacle (16). The system comprises a capacitive sensing probe (12), for sensing a capacitance between the capacitive sensing probe (12) and an electrically conductive portion of the receptacle (16). The system also comprises a control circuit (15) connected to the capacitive sensing probe (12) for detecting a level of the liquid in the receptacle (16) based on said capacitance, a non-isolated AC power supply (11) arranged to power the control circuit (15), the non-isolated AC power supply (11) having an electrical connection between its input and its output, and at least one filter capacitor (C1, C2) connected in series between the capacitive sensing probe (12) and the control circuit (15).