Abstract
The Servo-Chem automatic beer analyzer (SCABA) provides automated determinations of alcohol, specific gravity, real extract, original extract, apparent and real degree of fermentation, pH, and color. The analyzer was evaluated to determine its reliability and precision. The data obtained were compared to that obtained through the volumetric alcohol determination, ASBC method Beer-4A. The analyzer operates by oxidizing the alcohol to acetic acid, generating heat, which causes a change in the resistance of the filaments, resulting in a change in the electric current in the Wheatstone Bridge. Specific gravity was determined in situ with a Mettler Paar digital density meter. The sample data were then compared to a set of standards previously processed through the unit. All data except alcohol, specific gravity, pH, and color, were calculated by means of a series of equations using the instrument's microcomputer. After analyzing replicate beer samples, statistical analysis of the two methods indicated no difference in precision (variance). The Student's t test for individual samples generally indicated a difference between the mean ASBC values and the mean SCABA values for both alcohol and real extract. Twenty samples per hour could be analyzed versus 12 distillations per shift.
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