chapter  3
30 Pages

FREEZER DRYER INSTRUMENTATION AND CONTROL

The freeze drying process is controlled on three parameters: time, tem­ perature, and pressure. The ancillary valve switching functions within the cycle are also performed, as a general rule, by the freeze dryer con­ trol system. The control system will also perform other tasks associ­ ated with the freeze dryer; these functions are as diverse as the control of sterilisation to the production of batch records.