Full sensing unit

Details Full sensing unit Full sensing unit

1989-09-25

1991-03-26

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

340620, G08B 2100

Patent

active

050019279

ABSTRACT:
A liquid sensing assembly (10) senses the level of liquid (18) in a container (12). The assembly (10) includes a reference sensing capacitor (16) for sensing the dielectric constant of the liquid and a level sensing capacitor (14) for sensing the level of the liquid with a dielectric factor. A housing (20) forms one plate of the capacitors (14, 16), and two separate coiled wires form the second plates of the capacitors (14, 16). The capacitors (14, 16) are located within the housing (20) and separated by a seal (46) to prevent liquid from passing therethrough. The reference capacitor (16) is located in the upper end (28) of the housing (20) and receives the liquid directly at an inlet (52) and fills to overflow at an outlet (56) into the container (12). The level capacitor (16) is in the lower section of the housing (20) to sense the level in the container (12).

REFERENCES:
patent: 3901079 (1975-08-01), Vogel
patent: 4296472 (1981-10-01), Sarkis
patent: 4296630 (1981-10-01), Jung et al.
patent: 4434657 (1984-03-01), Matsumura et al.
patent: 4467646 (1984-08-01), Berryman et al.
patent: 4479116 (1984-10-01), Kobayashi
patent: 4574328 (1986-03-01), Maier
patent: 4594892 (1986-06-01), Asmundsson

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