User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 9
5. Calibration and alarms data
Any value entered under calibration menu and all calculated operating parameters will be saved in the memory when you change
from argon to helium or vice versa.
Same thing applies for alarm set points if you have this option and temperature coefficient entered in the hidden menu.
So, most of the time, the calibration will stay valid when changing the background gas selection. Of course, a purging time is
necessary to clean out argon or helium.
When you change the background gas selection, a new flow table in the software is used. The tuning of the flow loop is also
changed. Calibration and alarms are saved in the memory. The signal processing algorithm is also modified accordingly.
There is also some hardware change in the cell design in this version of SERVOPRO PLASMA.
6. Conclusion
To resume, your dual background version analyzer is in fact like two analyzers in the same cabinet. However, there is some
differences between argon and helium backgrounds.
1) Starting count value will be different
2) Default sample flow will be different.
Recommended sample flow: Argon 75 sccm
Helium 75 sccm
To get the same system overall response time, the by-pass flow, when in helium will have to be higher.
3)
The dual background version is shipped with a metal based moisture trap. If you operate in argon for a long period,
get a molecular sieve trap from Servomex Canada
.
IMPORTANT
The metal based trap is made with ¼” O.D. S.S. tubing. Don’t allow air or high level of O
2
to flow in it because excessive
heat would be generated. Install the trap only when all lines are purged. This trap must be installed to get good results
when operating under helium. This trap can be shipped back to Servomex Canada for proper regeneration. We strongly
recommend to keep one in stock.
4) When changing background gases from argon to helium, or vice et versa, all the previously in use background gases
must be purged out before attempting any calibration or expecting any reliable reading. Normally this is done in 24
hours.
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