Stainless steel sample loops are supplied with fittings that are not swaged onto the tube. It is important that the loop be completely bottomed in the injector port before the ferrule is swaged onto the tube. The depth of the tubing holes may vary slightly from port to port and from valve to valve. A fitting made up in one port may leave a small cavity in another port. The cavity causes high dispersion and peak distortion such as fronting, tailing, or broadening. It is good practice to label loop ends so they will be replaced in the same, respective ports that were used in swaging the ferrules. Hint: swaging ferrules separately on each side, into each respective valve port makes loop installation easier.  

• Take one end of the loop and place the nut (1) and ferrule (2) onto the tubing (3) with the threaded portion of the nut and tapered portion of the ferrule toward the end. See Figure A.
• Insert the tubing into port (4). Confirm that the tubing is bottomed in the valve port as shown in Figure A.
• While firmly pressing down on the tubing, hand-tighten the nut as tight as possible.
• With Fitting Wrench, tighten one quarter turn past finger tight. Remove the loop to confirm the ferrule is swaged onto the tube.
• Repeat steps a-d with the other end of the loop while the swaged end remains outside the valve port. See Figure B.
• Reinstall each end of the loop to their respective ports. See Figure C.

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