Collecting Subsamples from the LI-6400/XT

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For use with the LI-6400/XT, assemble the Trace Gas Sampling Kit with the compression fitting, ferrules, a septum, and the lower chamber exhaust tubes according to the following instructions.

  1. Remove the nuts from the compression fitting.
  2. Locate the lower chamber exhaust tubes for the LI-6400/XT (two pieces, shown in step 3), and two sets of ferrules.
  3. Install a brass nut on each of the tubes and install one set of ferrules on each tube, as shown. Note the orientation of the ferrules. The smaller, beveled piece must be installed first, facing the correct direction. When installed, the end of the tube should extend approximately 3 mm (1/8") beyond the ferrules.
  4. Insert the septum into the remaining nut. The septum has a self-sealing plastic coating on one side (identified by the glossy coating). For optimum sealing, install the septum with the glossy side facing the T-fitting.
  5. Assemble the T-fitting with the septum-containing nut on one "arm" of the fitting, and the short tube on the other "arm." Install the long tube on the "leg." Tighten the nuts, but do not over-tighten them, as this could create leaks around the septum and ferrules.
  6. Install the assembled kit in place of the standard lower chamber exhaust tube. The ends of the tubes can be enlarged slightly with a pair of needle-nose pliers (or similar tool) to facilitate installation on the exhaust port hose barbs of the LI-6400/XT.