A collection of associated control modules and/or equipment modules and other process equipment in which one or more major processing activities can be conducted.

NOTES

Units are presumed to operate on only one batch at a time.  Units operate relatively independently of one another.  This term applies to both the physical equipment and the equipment entity.

Examples of major processing activities are react, crystallize, and make a solution.

Specification notes

Typically Process Descriptions may be written for each unit type

It is not always a simple matter finding the Units. Often, specially in multipurpose plants or where CIP is involved, units are dynamic - that is that their boundaries can change (for example by acquiring or releasing equipment modules) during the execution of a recipe.

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