Apparatus and method for testing the level of an item in liquid

Details Apparatus and method for testing the level of an item in liquid Apparatus and method for testing the level of an item in liquid

1992-03-20

1994-05-17

McCarthy, Neil

Optics: measuring and testing

For light transmission or absorption

By comparison

356436, 356440, 7386384, 73 6148, 422 82, 436164, G01N 114, G01N 2159

Patent

active

053132688

ABSTRACT:
Apparatus for measuring the level of an item in a liquid including first and second light transmitting cylinders, a first piston and an associated conduit for conducting liquid to the first cylinder, a second piston and an associated conduit for conducting liquid to the second cylinder, a third piston and an associated conduit for conducting indicator solution to the second cylinder, a light source for transmitting light through the first and second cylinders, and a detector for measuring the difference in light transmissibility of the liquids in the first and second cylinders and providing an output depending thereon. A method of testing the level of an item in a liquid including the steps of providing a first sample of the liquid containing the item, providing a second sample of the liquid with a measured amount of indicator solution therein, comparing the light transmissibility of the first and second samples, and providing an output which is a measurement of the level of the item in the liquid.

REFERENCES:
patent: 1960615 (1934-05-01), Baker
patent: 1977359 (1934-10-01), Styer
patent: 2413261 (1946-12-01), Stackhouse
patent: 3111837 (1963-11-01), Evans et al.
patent: 3114610 (1963-12-01), Gafford et al.
patent: 3712792 (1973-01-01), Lyshkow
patent: 4009617 (1977-03-01), Johnson
patent: 4016079 (1977-04-01), Severin
patent: 4797000 (1989-01-01), Curtis
patent: 4856906 (1989-08-01), Sunstein et al.
patent: 4950610 (1990-08-01), Tittle

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