A self contained, specific wavelength, single beam colorimeter for
direct spectrophotometric measurement of the concentration of a given
solute in a test sample. An electrical circuit employing a
photoconductive cell converts the optical output into a linear, directly
readable meter output. The colorimeter is simple to operate and is
adapted for use in zero gravity conditions. In a specific application,
the colorimeter is designed to analyze the concentration of iodine
(I.sub.2) in potable water carried aboard a space vehicle such as the
IVB stage of Skylab.
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