Brooks Instrument SLA7810/20 - Manual (Page 12)

1-6
Section 1 Introduction
Model SLA7810 & SLA7820
Installation and Operation Manual
X-PR-SLA7800-PC-eng
Part Number: 541B047AAG
December, 2008
Figure 1-8 Typical Application of Upstream Controller
Note: The Controller Mode and valve type are determined at the time of
order. Mechanical parts must be changed to convert modes or valve types.
Upstream Controller Mode - The controller is set to maintain the
upstream process pressure constant, independent of downstream
pressure or flow variations (ref. Fig. 1-6). This is factory configured.
Downstream Controller Mode The controller is set to maintain the
downstream process pressure constant, independent of upstream
pressure or flow variations. This is factory configured.
Normally Open/Normally Closed Control Valve - Both Normally Open
(N.O.) and Normally Closed (N.C.) configurations are available. Normally
Closed is the standard valve type. The Normally Open valve may be
specified when Safety, Operation or Process considerations warrant this
type of valve.
Voltage Inputs/Outputs are factory configured and available on the
analog version of the device. This must be specified when ordered.
Model SL7820
Reactor
Mass Flow
Controllers