Patent ID: 7228736

Claim:
A sensor for use in determining the level of fill in a bin being filled with material, said sensor comprising a housing having first and second upper orifices, and a lower orifice, said housing also having a central chamber, an elongate primary hose connected to said lower orifice, in communication with said central chamber, and a secondary hose contained within said primary hose, having a length slightly less than the length of said primary hose, with the remote ends of said hoses being separated by a distance of less than one foot, one of said upper orifices of said housing being connected to a supply of air under pressure, and the other of said upper orifices being connected to pressure sensing equipment disposed at a remote location, the air under pressure added at one of said upper orifices normally flowing outwardly and downwardly from one of said hoses, with such outward flow normally not affecting the pressure condition in the other of said hoses, but upon the degree of the fill of the bin being such that material begins to closely approach the remote end of said primary hose, the air normally flowing out of said one of said hoses is caused to be deflected into the remote end of the other of said hoses, and thus causing the pressure in such other hose to increase, such pressure increase being sensed at the remotely located pressure sensing equipment, with this in turn affecting the rate of fill of the bin.