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Theory of Operation
Pneumatic Module 2
2-5
Electronics Regulator
The electronics regulator supplies a 0 – 100 psi air signal for the dome regulator.
The electronics regulator is driven by a 0 – 10 VDC signal from the interface board.
Dome Regulator
The dome regulators, which are self-relieving, “rough” in the commanded pressure.
The precise pressure is then achieved by the pump after closing the system valve.
System Transducer
The system transducer accurately measures (accuracy is specified as purchased,
0.01% minimum) the controlled pressure. This transducer should be calibrated at
a regular interval to maintain its stated accuracy.
Test Port
The device under test is connected to this port. This port is a 1/8 NPT female.
Drive Air-Supply Port
The supply air is connected to the drive-air supply port. The supply air should be
100 – 110 psi (7 – 7.5 bar). The pneumatic side is protected by a relief valve set at
120 psi. (8.3 bar). This port is a 1/4 NPT female connection.
Gas Supply Port
The clean, dry gas supply is connected to this port. The gas pressure should be 10%
above the full scale pressure of the controller. This port is a 1/8 NPT female connection.