Patent ID: 7553773

Claim:
A pressure controller for use in controlling pressure inside a process chamber based on pressure data obtained from a plurality of pressure sensors, the pressure sensors each connected to the process chamber and configured to detect the pressure inside the process chamber, the pressure controller being configured to execute: setting a pressure detection range for each of the pressure sensors, the pressure detection range for each of the pressure sensors being different from one another, at least two of the pressure detection ranges having an overlapping range; setting a selection value for each of the pressure sensors, wherein the selection value is used for selecting the pressure sensor to be used to obtain the pressure data for use in controlling the pressure inside the process chamber; selecting the pressure data to be used in controlling the pressure inside the process chamber by comparing the pressure data obtained from each of the pressure sensors to the corresponding selection value in each of the pressure sensors; and adjusting the pressure inside the process chamber based on the selected pressure data and preset pressure data.