Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample
Patent
1995-04-05
1997-04-08
Housel, James C.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing liquid or solid sample
422 75, 422 76, 422 77, 422108, 436 51, 436163, 356217, 356226, 356436, G01N 2125
Patent
active
056184956
ABSTRACT:
The invention relates to colorimetric titration method, a titrator and colorimeter device. The titrating apparatus comprises radiant energy means for producing radiant energy. The device includes means for modulating an amplitude of an intensity of the radiant energy at a modulation frequency. The radiant energy is partially absorbed by an adjacent solution within a sample beaker having a color indicator dissolved therein. Radiant energy focusing means focuses the modulated radiant energy transmitted through the sample and beaker on radiant energy detection means. The radiant energy detection means produces a transmitted signal wherein an intensity of the transmitted signal is directly proportional to the intensity of transmitted energy. Filtering means filters the transmitted signal, such that a center frequency of the filtering means matches the modulation frequency of the radiant energy means. The filtering means produces filtered transmitted energy signal representative of only the amount radiant energy transmitted through the solution from the radiant energy source, free of other sources of radiant energy. The colorimetric titrator also includes means for constructing a titration curve, means for computing the first derivative of the titration curve, means for computing the second derivative of the titration curve, control means for controlling titrant addition means in response to the first derivative of the titration curve and means for calling the endpoint of the titration by using the second derivative of the titration curve.
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Mount Andrew S.
Paul Douglas
Wheeler Alfred P.
Freed Rachel Heather
Goldman, Esq. Joel S.
Housel James C.
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