Tank level gauge and sensor head therefor

Details Tank level gauge and sensor head therefor Tank level gauge and sensor head therefor

1998-02-06

1999-02-23

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340618, 340619, 340620, 340624, 73313, 73319, G08B 2100

Patent

active

058748997

ABSTRACT:
A universal read head for a tank-level float gauge is adapted for use with any of certain different types of gauge rods which may be connected to a float element in the tank, including rods having an optical code thereon including a plurality of alternating reflecting and non-reflecting stripes arranged between magnetic end portions, and a rod with one or more magnets disposed adjacent to each end thereof and longitudinally spaced magnets intermediate the ends. The sensing head includes an LED light source for illuminating the rod and two phototransistors coupled in quadrature relationship for detecting the illuminated optical code patterns, and two magnetic reed switches for sensing the proximity of magnets on the gauge rod. The sensors are coupled to a microprocessor for interpreting the electrical signals generated by the sensors to identify the type of gauge rod being used and to provide an indication of the position of the gauge rod relative to the sensors.

REFERENCES:
patent: 4320394 (1982-03-01), John, Jr.
patent: 4804944 (1989-02-01), Golladay et al.
patent: 5124686 (1992-06-01), White et al.
patent: 5585786 (1996-12-01), Clark et al.

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