Chapter Two: Installation Setup
17
Installing the Unit
The 649 Pressure Controller should be mounted to provide downstream pressure control.
Connect the controller so that the flow arrow points toward the system whose pressure you need
to control.
Note
Connect the 649 controller to your system so that the gas flows in the
direction of the flow arrow on the front of the unit.
Downstream Pressure Control
Downstream pressure control occurs when the 649 controller is positioned before the controlled
pressure volume in the gas flow path, so that the 649 unit controls the pressure downstream of the
649 controller itself. The gas enters the 649 controller on the flow meter side and flows in the
direction of the flow arrow on the front of the unit. The outlet of the instrument is the controlled
pressure port.
Figure 5: Downstream Pressure Control
Note
The 649 controller is designed for downstream pressure control only.
That is, it controls the pressure of a system located downstream of the 649
controller.
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