Fluke 7350 Electronics Regulator, Dome Regulator, System Transducer, Test Port, Gas Supply Port

Theory of Operation 2

Pneumatic Module

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.

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