Liquid-level detector

Details Liquid-level detector Liquid-level detector

1989-06-23

1991-02-05

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

With illumination

250577, 340619, G01F 2302, G01N 2141

Patent

active

049894528

ABSTRACT:
A probe is disclosed, for lowering into a water-well or other hole. The probe includes conductivity measuring electrodes, to distinguish between e.g., water and contaminants, such as gasoline. The probe also includes an optical sensing facility to locate the junction between air and liquid. The probe comprises a transparent plastic tube, mounted inside a housing. A beam of light from a LED passes obliquely through the plastic tube and onto a photo-transistor. When liquid is encountered in the well, the liquid enters the tube: the change in refractive index now directs the beam away from the photo-transistor. The optical and conductivity sensors are both actuated at the same depth.

REFERENCES:
patent: 3636360 (1972-01-01), Oishi et al.
patent: 4193004 (1980-03-01), Lobdell et al.
patent: 4297588 (1981-10-01), Hastbacka
patent: 4673819 (1987-06-01), Rose
patent: 4703314 (1987-10-01), Spani
patent: 4733095 (1988-03-01), Kurahashi et al.

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