Replace the Analysis Port Filter

  To avoid analysis problems, the new filter and O-ring must be clean. Wear gloves when performing this task. Do not touch the parts with bare hands.

  1. Remove the dewar and sample tube (or plug).
  2. Close the analysis port (sample valve).
  3. If the O-ring and filter are stuck in the port, use a fingernail or plastic instrument to remove them. Using a metal instrument may scratch the sealing surface, causing a leak.
  4. Replace the filter and the O-ring.
  5. Carefully reassemble the sample tube fitting, filter, O-ring, and manifold connector; then hand tighten. Then tighten with a wrench to prevent leaks when evacuated.
 
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