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Reversing the Metering Pump to Control a Continuous-Flow Pasteurizer

Food and Drug Administration, Division of Microbiology, U.S. Department of Health, Education, and Welfare, Cincinnati, Ohio 45226

ABSTRACT

Pasteurization can be controlled by reversing rotation of the metering pump and the response time measured. A metering pump operated at 28,000 liters per hour was used to recirculate milk (67.8 C) in a closed loop. A thermocouple controlled the reversible motor controller. "With milk flow at 28,000 liters per hour (1.8 m/sec) at 78.3 C, a trial started 67.8-C milk from the metering pump to flow over the thermocouple. The thermocouple responded to the 67.8-C milk in 0.4 sec, and all milk below 71.7 C was pulled back to the thermocouple within 3.2 sec. Since a dual-stem flow diversion valve has a response of about 0.2 sec, reversing the rotation of the metering pump offers no potential for improving the response time of pasteurization control systems.