Campbell Scientific AP200 CO2/H2O Atmospheric Profile System - Manual (Page 105)

Appendix H. Using Swagelok ® Fittings
This appendix gives a few tips on using Swagelok ® tube fittings. For more
information, consult a local Swagelok ® dealer or visit their website 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—6.0 mm is very close to 0.25 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 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, it is an indication that the
threads have been damaged. Replace any damaged nuts and fittings.
H.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 it is being cut.
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.)
First-time assembly, metal tubing:
Extra care is needed to avoid over-tightening brass fittings when used with
metal tubing. These notes apply to reducers and port connectors as well as
metal tubing.
No insert is required with metal tubing. NOTE
H-1