Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 91)

Appendix E. Using Swagelok ® Fittings
This appendix gives a few tips on using Swagelok ® tube fittings. For more
information, consult your local Swagelok ® dealer or visit their web site at
www.swagelok.com .
General Notes:
• Do not use fitting components from other manufacturers – they are
not interchangeable with Swagelok ® fittings.
• Do not attempt to use metric fittings. Six mm is very close to 1/4 in,
but they are not interchangeable. Metric fittings can be identified by
the stepped shoulder on the nut and on the body hex.
• Make sure that the tubing rests firmly on the shoulder of the tube
fitting body before tightening the nut.
• Never turn the fitting body. Instead, hold the fitting body and turn the
nut.
• Keep tubing and fittings clean. Always use caps and plugs to keep
dirt and debris out.
• Do not overtighten fittings as it will damage the threads.
If a nut cannot be easily tightened by hand, this indicates the threads have been
damaged. Replace any damaged nuts and fittings.
E.1 Assembly
The first time a Swagelok ® fitting is assembled, the ferrules become
permanently swaged onto the tube. Assembly instructions vary depending on
plastic or metal tubing. The assembly instructions are also slightly different for
an initial installation than for subsequent reassembly.
First-time assembly, plastic tubing:
1. Cut the tubing to length.
2. Make sure the cut is square and free of burrs.
3. Some types of plastic tubing have an aluminum layer. Take care not to
flatten the tube as you cut it.
4. Push an insert into the end of the tubing.
5. Do not remove the nuts and ferrules from the fitting. Simply insert the
tube into the assembled fitting until it bottoms out.
6. Rotate the nut finger-tight.
7. While holding the fitting body steady, tighten the nut one and one-quarter
turns. (For 1/16 in or 1/8 in-sized fittings, tighten the nut three-quarters
turn.)
E-1