A process system adapted for processing of or with a material therein. The process
system includes: a sampling region for the material; an infrared photometric monitor
constructed and arranged to transmit infrared radiation through the sampling region
and to responsively generate an output signal correlative of the material in the
sampling region, based on its interaction with the infrared radiation; and process
control means arranged to receive the output of the infrared photometric monitor
and to responsively control one or more process conditions in and/or affecting
the process system.
