Patent ID: 7121140

Claim:
A liquid quantity sensing device comprising: a hollow tube having more than one hook eyes formed along its top edge, and corresponding number of pores opened on said tube under said hook eyes; a float floating on the liquid in said tube, and movable up and down in accordance with the change of liquid level; a base having a central liquid inlet and being engage to the bottom of said tube; a case having several screw holes around its flange edge and a recessed accommodation cavity, wherein a sensor aperture is opened at the bottom center of said accommodation cavity, and the equal number of hooks to that of said hook eyes on said tube is formed around the bottom edge of said case; an electrical circuit board together with a sensor element attached beneath its bottom, wherein said electrical circuit board is settled in said accommodation cavity of said case in the manner emerging said sensor element out of said aperture; and a lid covering on said case to keep said accommodation cavity in sealed state; said liquid quantity sensing device is constructed as such.