ABSTRACT
The use of automated systems, such as sensors, actuators, and controls, specically in the food industry involves some peculiarities. In most other industrial processes, chemicals are inorganic. But the food industry will generally be processing organic materials. In some cases, the control system must maintain the conditions necessary for the life of microorganisms; in others, the reverse process, for example, the deactivation of microorganisms or enzymes, is true. In this context, all the elements of the system should be capable of supporting, for instance, the temperatures of sterilization and the presence of liquid for washing and cleaning, which may be at high pressure. Thus, the materials used in casings must be in accordance with the standards and also achieve mechanical and chemical resistance when faced with aggressive substances. These materials cannot provide conditions for the proliferation of bacteria and other pathogenic organisms; generally used materials are stainless steel or glass. These characteristics affect the quality and price of system elements.
