Electronic fluid-level sensor with three state indicator

Details Electronic fluid-level sensor with three state indicator Electronic fluid-level sensor with three state indicator

1989-10-05

1992-05-05

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340624, 73313, 73307, 33366, 33378, G08B 2100

Patent

active

051111888

ABSTRACT:
The invention is an electronic sensor for producing an indication of fluid level in a hose or tube and an electronic indicating circuit that uses the sensor's indication of fluid level for asserting one of three indicators depending upon whether the fluid level is above a reference by a small distance, within the small distance of the reference, or below the reference by the small distance. A float retaining a core having a relative magnetic permeability significantly greater than one is supported by fluid near three vertically disposed coils. The center coil is excited by a source of alternating current and the position of the core above or below the center coil determines the voltages present in the top and bottom coil. The voltages present in the top and bottom coils are rectified and added in polarity opposition to produce an indication of fluid level. A plurality of voltage comparators, supplied by the indication of fluid level and fixed voltages, are used to assert the appropriate indicator. The indicators are pulsed on and off by a switchable oscillator when the primary supply voltage falls below a predetermined level. In the preferred embodiment, the indicators are lamps, the lamps are placed remotely from the sensor, and a source of adjustable voltage is added to the indication of fluid level.

REFERENCES:
patent: 4080828 (1978-03-01), Akita et al.
patent: 4144741 (1979-03-01), Nakamoto et al.
patent: 4447743 (1984-05-01), Bean et al.

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