User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 9
NOTE TO THE READER
The SERVOPRO PLASMA trace nitrogen in argon or helium analyzer version is shipped configured for argon.
We strongly recommend you read the standard User Manual followed by this addendum. Reading this addendum supposes that
you have read and understood the User Manual.
1. User Manual
This User Manual applies to both versions of the K2001 analyzer, i.e argon or helium. Since the most popular version is argon,
all published manuals refer to argon as the background gas.
You must read this addendum to know how to select argon or helium backgrounds.
2. Flow control system
The flow control valve used in the SERVOPRO PLASMA trace nitrogen analyzer for helium background is the same as the one
for the argon version. This valve is not a tight shut off valve. Its purpose is to maintain the flow at the default flow set point, i.e.
75 sccm. It is possible to have a little flow (usually not more than 10 sccm for inlet pressure of 10 psig) even if the flow set point
value is 0 sccm. You don't have to worry about that, it is a normal phenomenon. Also, please notice that the plasma is shut off
when the real flow is below 20 sccm for more than 30 seconds. The analyzer should be operated and calibrated with a flow set
point of 75 sccm and stable inlet pressure. The ideal inlet pressure range is between 5 to 15 psig.
3. Leaks
The most critical point in trace nitrogen analysis is to avoid the pollution of the sample stream. The leak integrity of the sampling
and calibrating system is critical for the performance of the analyzer, no doubt can subsist about this. Be aware that leaks are
more critical with helium than with argon.
Furthermore, the sample must be as dry as possible. You should use the supplied trap to keep the sample dry. It is also
recommended to have one trap for each calibration cylinder.
4. Configuration and operation
4.1 Introduction
All configuration, calibration, diagnostic and run menus described in the standard User Manual also apply to the
argon/helium version of the SERVOPRO PLASMA series analyzer.
There is a supplementary "HIDDEN" menu to select the starting count value and the background operating gas.
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