Liquid-level detector

Details Liquid-level detector Liquid-level detector

G - Physics

01

F

340/140.1

G01F 23/02 (2006.01) E21B 47/04 (2006.01) E21B 47/10 (2006.01) G01F 23/00 (2006.01) G01F 23/24 (2006.01) G01F 23/292 (2006.01) G01N 21/41 (2006.01)

Patent

CA 1326519

- 26 - Abstract of the Disclosure LIQUID LEVEL DETECTOR A probe is disclosed, for lowering into a water-well or other hole. The probe includes conductivity measuring electrodes, to distinguish between eg 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.

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