Level detector for storage tanks for fluids

Details Level detector for storage tanks for fluids Level detector for storage tanks for fluids

2005-11-01

2005-11-01

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

C073S30400R, C073S29000R, C073S292000, C073S295000, C340S622000

Reexamination Certificate

active

06959599

ABSTRACT:
A level detector for storage tanks for fluids comprises a microprocessor, a network of resistive elements connected in series or parallel, and a plurality of conductive elements between them, connected across a power source. The resistive elements have a high temperature coefficient, and are heated by passing a high electric current through them, after which a low electric current is passed through them and the voltage between them is sampled by the microprocessor. The resistive elements lose heat through conduction, so that a pair of resistive elements can be detected having differential cooling between them as a consequence of being adjacent to the void within the tank or the fluid within the tank. Thus, an approximation of the fluid level within the storage tank can be determined and signalled remotely.

REFERENCES:
patent: 3145567 (1964-08-01), Bobrowsky
patent: 3399568 (1968-09-01), Wilson
patent: 3479875 (1969-11-01), Riddel
patent: 3696675 (1972-10-01), Gilmour
patent: 4129848 (1978-12-01), Frank et al.
patent: 5323652 (1994-06-01), Parker
patent: 5707590 (1998-01-01), Thomas et al.
patent: 6098457 (2000-08-01), Poole
patent: 1177281 (1984-06-01), None

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