User Manual SERVOPRO Plasma Trace N
2
Analyzer
6.0 INSTALLATION
20
NO ANALYZER FRONT END SYSTEM
Some users wish to monitor the inlet flow with a falling ball rotometer. Those rotometers (or flowmeters)
are calibrated at atmospheric pressure. The flow indicated will be wrong, it must be compensated for the
line pressure. Furthermore, these types of rotometers are absolutely not leak tight. Air will diffuse into the
system, there will also be some permeation through the material used to build it. There is also a risk that
someone tries to control the flow with the valve mounted on this rotometer (if any). This will become in
competition with the analyzer internal flow control system.
Problems caused: - line pollution
- flow instability
- reading will be noisy
- reading will definitely drift.
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