Visual comparator with test chart and method for evaluating contamination of washing fluids
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United States of America Patent
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Jan 20, 1998
Grant Date -
N/A
app pub date -
Feb 18, 1997
filing date -
Feb 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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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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