초록 ▼

A sensing apparatus including: a first electrode member; a second electrode member arranged at opposing positions a predetermined distance away and electrically isolated from the first electrode member; and an electric circuit connected to the first and second electrode members. The first and the se

A sensing apparatus including: a first electrode member; a second electrode member arranged at opposing positions a predetermined distance away and electrically isolated from the first electrode member; and an electric circuit connected to the first and second electrode members. The first and the second electrode members are operatively connected by an impedance formed between the first and the second electrode members in response to existence of a substance to be sensed between the first and the second electrode members. The electric circuit outputs a signal in response to the impedance. The sensing apparatus is applicable for detecting, for example, the level of a liquid in a vessel.

대표청구항 ▼

A sensing apparatus for sensing existence of a substance, comprising: containing means for containing the substance, said containing means being formed of an electrically insulating substance; electroconductive support means for electrically grounding at least one end of said containing means; a fir

A sensing apparatus for sensing existence of a substance, comprising: containing means for containing the substance, said containing means being formed of an electrically insulating substance; electroconductive support means for electrically grounding at least one end of said containing means; a first electrode member mounted directly on a surface of said containing means; a second electrode member mounted directly on said surface of said containing means, and arranged at an opposing position a predetermined distance away from and electrically isolated from said first electrode member; and electric circuit means for detecting a capacitance formed between said first and second electrodes, said electric circuit means being operatively connected to said first and second electrode members and to said ground; said first and second electrode members being operatively connected by a first capacitance (Ca) formed by a part of said containing means between said first and second electrode members and a second capacitance (Cc) formed by said substance to be sensed between the first and second electrode members in said containing means, and said electric circuit means outputting a signal in response to changes in said first and second capacitances with respect to a reference capacitance circuit (Cb, Cd) to ground.