Abstract: The disclosure relates to an apparatus and method for controlling a system used to pasteurize food products such as milk, orange juice and raw eggs. Such system has components including at least one product tank, a pump for flowing a product through the system, a flow diversion device and a heat exchanger. The apparatus has a programmable logic controller linked to at least one component and also includes a display panel having (a) a depiction relating to one of the components, and (b) an input device such as a touch-pad type pushbutton connected to the controller for controlling a component. There are several depictions displayed in sequence and when a depiction is displayed, the input device associated therewith is also displayed and may then be actuated. After pasteurization, a batch report is printed. Vitamin injection is optionally available.

Abstract: The improved milk pasteurizing control apparatus is of the type having a flow diversion valve controller in an enclosure with a door, panel or the like required to be sealed on the outside of the enclosure by a regulatory official. Such seal is applied only after the official is satisfied that the controller and its control routine is operating properly. The improvement includes a controller with a computer chip for executing a control routine programmed in the chip. A barrier, overlay or other obstructing technique within the enclosure "blocks" access to the chip program and prevents alteration of the routine. If the exterior seal is broken (to perform certain types of maintenance, for example), the door may be re-sealed by the official without again testing the entire control routine.