User Manual SERVOPRO Plasma Trace N
2
Analyzer
6.0 INSTALLATION
22
SAMPLE STREAM SELECTION SYSTEM ACCEPTABLE
All V valves are diaphragm or bellow type valves made of stainless steel. The connections are ⅛”double
ferrule compression type. The inlet by-pass rotometer could be installed to provide faster response time.
By-pass flow must be constant. By-pass rotometer could also be installed, it’s flow must be constant.
This will speed up purge and response time since the flow in the analyzer is small (25 sccm). The drawback
of this system is the dead unswept volume introduced by each unselected valve. The discharge branch
will slow down response time and introduce some noise and long term drift. The length of each branch must
be made as small as possible to minimize this problem. Furthermore, the length of section is also a
problem if there are many V valves. For example if V1 is selected (open) all other valves are closed, based
on number of valves the unswept dead volume can become too high. The next drawing shows a way to
overcome this situation.
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