公开(公告)号：CA2006480A1

公开(公告)日：1990-07-06

申请号：CA2006480

申请日：1989-12-21

Applicant: STANDEX INTERNATIONAL CORPORATION

Inventor： GOEKLER, LEWIS E.

IPC: G01F23/26

Abstract: A non-intrusive fluid level detector including a single point capacitive sensor (C4) mounted on the outside surface of a receptacle (10) such that capacitive principles can be utilized to sense the level (1, 2) of a liquid contained within the receptacle (10). The sensor assembly is disposed in a substantially fixed position on the exterior wall of the receptacle (10) wherein the dielectric effect of the liquid changes the effective capacitance of the sensing capacitor (C4) as the liquid rises and falls within the receptacle (10). This change in effective capacitance is detected by electronic circuitry included in the detector device. In one embodiment, the fluid level detector is directly mounted to a completely non-conductive receptacle (10). In another embodiment, the fluid level detector is mounted to a non-conductive window (12) which is an integral part of a receptacle fabricated out of a conductive material.