User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 1 61
If you are not using your calibration gas cylinder for a long period of time, for any reason, close
the cylinder valve.
Figure 3
4.0 Avoiding pitfalls
Intended as practical guidelines, here are some rules of thumb.
Use stainless steel lines. "Plastic" type lines must not be used when you are working with ppm
level gases.
1. Use stainless steel compression-type fittings. Avoid pipe threads with Teflon tape sealant.
When installing compression-type fittings, be sure that the outside diameter of the S.S. tubing
has no scratches. Clean the outside O.D. of the tube and ferrules with acetone. Do not
overtighten the fitting. Normally 3/4 to 1 1/4 turn are enough for Swagelok fittings.
2. Use stainless steel pressure regulators. Neoprene and Buna-N type diaphragms, will allow
atmospheric contaminants to diffuse in your system.
3. Avoid the use of rotary stream selection valves. If you have no choice, use a valve with the
smaller orifice available to avoid cross flow port contamination; furthermore, install on
particle filter on each inlet port. However, please remember that this is not recommended by
Servomex Canada.
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