Patent ID: 6168085
Filing Date: 2001-01-02
Classification: G05D

Abstract:
A system for controlling temperature and humidity of an environment for a process chamber for semiconductor manufacturing materials, the system comprising: a environmental control unit for providing a supply of temperature and humidity controlled gaseous working fluid to the process chamber through a flow path; a filter disposed in the flow path between the environmental control unit and the process chamber; a first sensor assembly connected to the flow path downstream of the filter for sensing the environmental parameter of the gaseous working fluid, said first sensor providing a first sensed value for monitoring parameters of the gaseous working fluid within the process chamber; a second sensor assembly connected to the flow path upstream of the filter for sensing a controlled environmental parameter of the gaseous working fluid, said second sensor providing a second sensed value; and a controller operatively connected to said first and second sensor assemblies for receiving said first and second sensed values, and operatively connected to the environmental control unit for controlling the output of the environmental control unit responsive to said first and second sensed values.