What is one requirement for the construction of the agitator shaft in a vat pasteurizer?

The requirement that the agitator shaft in a vat pasteurizer should minimize risks of contamination is crucial to maintaining the safety and quality of the pasteurized product. Contamination can occur from various sources, including the materials used in the construction of equipment or the design of the machinery itself. An agitator shaft that minimizes contamination risks is typically made from hygienic materials and designed to limit the accumulation of food residues and bacteria. This ensures that the pasteurization process is effective and that the final product is safe for consumption.

While some of the other options may have practical implications, minimizing contamination is foundational in food safety compliance regulations. This is particularly important in pasteurization processes, where the goal is to destroy harmful microorganisms while preserving the quality of the product. Hence, focusing on the safety implications by selecting materials and designs that reduce contamination risk is essential in the construction of the agitator shaft.