Title: Automatic level measuring and control system for dispensing bin

Abstract: A single length of insulated, stranded steel cable extends vertically through a bin or other material container and functions as a radiating antenna for an electrical signal transmitter. The reactance of the antenna, which varies as a function of the level of material in the container adjacent the antenna, is inductively linked to an oscillator circuit in the transmitter. The transmitter's signal which is altered in frequency with changes in the antenna's reactance is combined with that of a constant frequency reference signal. The frequency of the resulting difference signal is employed to form a remote indication of the material level and to provide control information for automatically maintaining or varying material levels.

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Inventors: Spaw, Robert L. (Houston, TX, US)

Application Number: 439056
Filing Date: 1974-02-04
Publication_date: 1976-02-03
Assignee:
Primary Class(es): 222/56 222/64, 340/617
Other Classes:
US Patent Ref:

2381505	Aug, 1945	Lindholm	222/56.
2621517	Dec, 1952	Sontheimer	73/304.
2674396	Apr, 1954	Peterson	222/56.
2774959	Dec, 1956	Edelman	340/244.
2955466	Oct, 1960	Coles	73/304.
3036736	May, 1962	Murphy	222/56.
3140608	Jul, 1964	Clark	73/304.
3277711	Oct, 1966	Roberge	73/304.
3404963	Oct, 1968	Fritsche	222/56.

Other Refs:
Primary Examiner: Reeves, Robert B.
Assistant Examiner: Scherbel, David A.
Attorney: Torres & Berryhill