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In-Line Monitoring of the Milk Content of a Detergent Solution by Electrical Conductivity¹

² USDA, ARS, NCR
³ Department of Agricultural Engineering
⁴ Pinfst Philippine Women's University, Manila, Philippines
⁵ Department of Food Science and Nutrition, University of Missouri, Columbia 65201

ABSTRACT

Acceptability of electrical conductance for monitoring the quantity of milk in cleaning solutions under in-line conditions was investigated. Conductance measurements were with both alkaline and acid detergent solutions with milk concentrations of 0, .01, .1, and 1.0% (vol/vol) and temperatures of 20, 45, and 70 C. Over half the variability of conductance with both alkaline and acid detergents was due to the interrelationship between detergent and milk. Concentration of milk was responsible for less than 1% of the variability in solutions of acid detergent. Less than 25% of the variability could be attributed to milk concentration in alkaline detergent solutions. Equations were constructed to relate temperature and concentrations of milk and detergent to conductance for both alkaline and acid solutions. The equations could not predict accurately the amounts of milk solids injected into the solution flowing through a sanitary milk pipeline. Conductance of the solution was highly dependent upon the detergent concentration of the solution.

¹ Contribution from the University of Missouri Experiment Station. Journal Series No. 6731.