Method and apparatus for automatically analyzing fluids

Details Method and apparatus for automatically analyzing fluids Method and apparatus for automatically analyzing fluids

1974-03-15

1976-04-27

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

23230R, 23253R, 250576, 356 36, 356184, 356205, 356246, G01J 350

Patent

active

039531368

ABSTRACT:
A method of colorimetrically analyzing even heavily turbid or already strongly colored water by first sensing transmitted light from a light beam through a sample of the fluid, adding color-producing test reagents to the sample, again sensing transmitted light from an identical light beam, and comparing the sensed light readings to detect the change, if any, produced by the added reagents. Two colorimetric cells are used, one for testing before the addition of reagents and the other after, with the cells being defined by glass cylinders in which pistons reciprocate to pump measured samples to the cylinders, clean the cylinders on each pumping stroke, and "valve" or block the light beam so that the other cylinder can be "read". Simple displacement pumps for the reagents, and the cell pistons, cooperate with valves defined by pincher arms squeezing flexible tubing to move measured amounts of sample and reagent throughout the analyzer. A common drive simplifies obtaining proper relative operation of the analyzer components.

REFERENCES:
patent: 1960615 (1934-05-01), Baker
patent: 2019871 (1935-11-01), Pettingill et al.
patent: 3401591 (1968-09-01), Anthon
patent: 3844661 (1974-10-01), Birkett et al.

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