User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 1 62
4. If you are installing a SERVOMEX ppb analyzer, all compression tube fittings must be
replaced with metal-to-metal seal fittings, (so called VCR
®
-type fittings). Tubing size will be
1/4" electropolished stainless steel. All accessories (i.e. sample trap, valves, filters) must have
VCR
®
fittings. The ppb trace N
2
in argon analyser is supplied with such fittings.
5. Avoid the use of quick connectors to temporarily connect cryogenic trucks or other sample
points. Use CGA-type fittings and reduce to 1/8" O.D. stainless steel tubing. Keep your
sample line on purge with DRY and particle-free gas when they are not in use.
6. Don't use SNOOP® type liquid for finding leaks on such systems. If you have leaks, the liquid
will go inside the system. It will take a long time to desorb that moisture from the lines.
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