Patent ID: 6926585

Claim:
A pressure control system comprising: a plurality of pressure controllers configured to supply a pressurized fluid to a plurality of pressure-controlled sections; a master pressure controller configured to supply a pressurized fluid having a reference pressure; a plurality of calibration chambers corresponding to said pressure controllers, the pressurized fluid being supplied from said master pressure controller to said calibration chambers and the pressurized fluid being supplied from said pressure controllers to said calibration chambers, respectively; differential-pressure detecting devices provided in said calibration chambers, each of said differential-pressure detecting devices being configured to detect a differential pressure between the pressurized fluid supplied from said master pressure controller and the pressurized fluid supplied from said pressure controller; and an arithmetic device configured to receive a signal from said differential-pressure detecting device and adjust an output of said pressure controller so that the differential pressure between the pressurized fluid supplied from said master pressure controller and the pressurized fluid supplied from said pressure controller becomes zero or approximately zero.