Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 92)

Appendix E. Using Swagelok ® Fittings
First-time assembly, metal tubing:
Extra care is needed to avoid overtightening 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.
1. Do not remove the nuts and ferrules from the fitting. Simply insert
the tube into the assembled fitting until it bottoms out.
2. Rotate the nut finger tight.
3. While holding the fitting body steady, tighten the nut until it feels
tight. This will normally be less than one full turn. Tightening a full
one and one-quarter turns will damage the threads on the fitting and
nut.
Reassembly, plastic or metal tubing:
You may disassemble and reassemble Swagelok ® tube fittings many times, but
the assembly process is slightly different than the first assembly.
1. Insert the tube with pre-swaged ferrules into the fitting until the front
ferrule seats against the fitting body.
2. Rotate the nut finger tight.
3. While holding the fitting body steady, tighten the nut slightly with a
wrench.
E.2 Common Replacement Parts
Tubing
Campbell Scientific can provide several types and sizes of plastic tubing as
shown in TABLE E-1. A tubing cutter, pn 7680, can be used to cut these
tubes.
TABLE E-1. Available plastic tubing sizes, construction, and usage guidelines
CSI pn Tubing Type OD (in) ID (in) Length (ft) Construction Notes
15702 Synflex 1300 1/4 0.17 500 Black HDPE
jacket, overlapped
aluminum tape,
ethylene
copolymer liner
Aluminum
layer limits
diffusion; best
for sample
tubes
15703 3/8 1/4 250
19164 1/2 3/8 250
26506 LLDPE 3/8 1/4 500 Black linear low-
density
polyethylene
More flexible
than HDPE
25539 1/2 3/8 500
19499 HDPE 5/8 1/2 100 Black High-
density
polyethylene
Required for
larger
diameter
NOTE
E-2