Visual comparator with test chart and method for evaluating cont

Details Visual comparator with test chart and method for evaluating cont Visual comparator with test chart and method for evaluating cont

1997-02-18

1998-01-20

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Lubricant testing

73 5307, 73 6171, 73 5303, G01N 3328, G01N 2171, G01N 1507, G01D 2100

Patent

active

057103739

ABSTRACT:
A visual comparator for use in evaluating the nature and extent of contamination in a solvent used for cleaning mechanical parts. The comparator comprises an opaque frame, and an array of viewing apertures is formed in the frame. Each of said apertures is covered by a translucent viewing panel, with certain of the viewing panels comprising a first array having a graduated sequence of predetermined colors and optical densities, each indicative of a given level of soluble liquid contamination. The remainder of the viewing panels comprises a second array having a graduated sequence of graduated optical densities, each indicative of a given level of contamination by suspended particles. The arrays are arranged so as to facilitate comparison between both the color and optical density of a sample of solvent received in a transparent tube, and both the color and optical density of a particular viewing panel when said viewing panel and said sample-containing tube are illuminated by an intense but diffused light source.

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