ABSTRACT
Isolator control systems The control system fitted to an isolator may be a simple, manual type or it may be a sophisticated, programmable logic controller (PLC)- or personal computer (PC) -driven unit; in either case, the aim of the control is to set up and to maintain the environmental conditions specified for the process in hand. Generally speaking, the two major parameters that must be maintained are the isolator pressure, be it positive or negative with respect to the isolator room, and the airflow rate, be it turbulent or unidirectional. More complex systems will include controls for temperature and humidity, and some systems may be required to control more exotic parameters, such as oxygen content (Figure 4.1 through Figure 4.3).
