Assembling the system 2-25
Installing fittings
To install fittings:
1. Slide the fitting and then the ferrule (large end of the taper first) over
the end of the tubing.
Compression screw assembly
2. Bottom the tubing and ferrule in the fitting seat.
3. As you press the tubing into the connector, tighten the compression
screw 3/4 of a turn beyond finger tightness. Tightening the compression
screw compresses the ferrule, fusing it onto the tubing in the correct
position.
Tip: Subsequent connections to this fitting will not require the extra
3/4-turn.
Cutting PTFE tubing
To cut PTFE tubing:
1. Estimate or measure the length of tubing required to connect the
components. Allow slack.
Tip: Do not pull tubing tightly around sharp corners.
2. Use a razor blade to cut the tubing squarely, taking care to avoid
crushing it.
3. Inspect the cut for burrs or scratches. Make sure the tubing is not
pinched closed.
Caution: Avoid angled cuts, which create eddies (unswept volumes) at
the connection. Tubing cut at an angle fits poorly into the connector or
port and can leak or separate.
Ferrule
Tubing
(Cut must be perpendicular
to the tubing axis.)
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