1-5
Section 1 Introduction
Model SLA7810 & SLA7820
Installation and Operation Manual
X-PR-SLA7800-PC-eng
Part Number: 541B047AAG
December, 2008
When the pressure controller is used in the “downstream pressure
regulation” mode as shown in Figure 1-7, the pressure in the process
vessel will be constant independent of upstream variation, provided the
upstream pressure does not fall below the downstream setting. Pressure
measurement and control takes place at the inlet side of the pressure
vessel.
The most common application of the pressure controller is in conjunction
with a mass flow controller (refer to Figure 1-8). Mass flow controllers
accurately measure and control the required quantity of process gas flows.
In this figure, the mass flow controllers will supply the desired quantity and
mixture of process gas while the pressure controller will maintain the
desired reactor pressure by varying the gas outflow. This system allows the
process reactants to be varied while maintaining a constant reaction
pressure.
The Model SLA7810/SLA7820 Pressure Controller has proportional and
integral control action. The reset or integral control is combined with the
proportional control action (normally referred to as P.I. control). Both
proportional band and integration time are customer adjustable with a
Brooks service tool.
Vessel
Pressure Controller
Vessel
Pressure Controller
Figure 1-7 Model SLA7810 Controller Downstream
Figure 1-6 Model SLA7820 Controller Upstream
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