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Clinical Chemistry 18: 568-570, 1972;
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Clinical Chemistry, Vol 18, 568-570, Copyright © 1972 by the American Association for Clinical Chemistry

A Linear Absorbance Converter for Continuous-Flow Colorimeters

Leonard Walker 1 and Elias Amador 1

1 Division of Clinical Pathology, University Hospitals of Cleveland, and Institute of Pathology, Case Western Reserve University School of Medicine, Cleveland, Ohio 41106.

Departments of Pathology, Drew Postgraduate Medical School and King General Hospital, 12012 Compton Ave., Los Angeles, Calif. 90059.

The photocell transmittance output from continuous-flow colorimeters can be converted into linear absorbance by means of a simple solid-state circuit. The circuit includes a field effect transistor operational amplifier and a logarithmic operator, plus several stabilizing circuit networks. The working range is 1.2 absorbance units, which for most applications is an improvement of 50% over the unmodified colorimeter, at wavelengths of 420 to 700 nm. The output can drive the conventional AutoAnalyzer recorder, or a 2-input, low-cost recorder such as the Heath Kit IR-18M.


Key Words: AutoAnalyzer colorimeter

Submitted on March 8, 1972
Accepted on March 25, 1972






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Copyright © 1972 by the American Association for Clinical Chemistry.