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Clinical Chemistry 17: 231-232, 1971;
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Clinical Chemistry, Vol 17, 231-232, Copyright © 1971 by the American Association for Clinical Chemistry

Design of an Analog Converter for Use in Colorimetry

Berton M. Lapidus 1, James W. Tetrud 1, and Arthur Karmen 1

1 Department of Pathology, New York University School of Medicine, NYU Medical Center, 550 First Ave., New York, N.Y. 10016.

A simple analog circuit, incorporating commercially available components, has been used to convert the output of a colorimeter photocell into units directly related to concentration. The converter is useful for analyses that obey Beer’s law approximately, with continuous-flow automatic analyzers or other colorimetric systems. The results obtained by analog conversion agree within 1% with the photocell output read out in the usual manner.


Key Words: conversion of photocell response to concentration units • speeded analyses

Submitted on October 19, 1970
Accepted on December 12, 1970






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Copyright © 1971 by the American Association for Clinical Chemistry.