Chamber Cap O-Ring

The cell chamber cap contains an O-ring that requires routine maintenance. The chamber cap O-ring should be greased at the beginning of each period of use.

Fine fibers and particles between the O-ring and its sealing surfaces can cause leaks, as can scratches or cuts in the O-ring or in the metal surfaces.

Grease the Chamber Cap O-Ring

  1. Turn the chamber cap counter-clockwise and lift it from the chamber.
  2. Place the chamber cap on a clean surface with the O-ring side exposed.
  3. Use a small drop of Dow Corning high vacuum grease (or equivalent).
  4. Distribute the grease evenly and completely around the O-ring groove.

  1. Replace the chamber cap.
  2. If recalibrating the pycnometer, allow the pycnometer to warm up for 30 minutes before calibrating.

Replace the Chamber Cap O-Ring

  1. Use a pointed tool and carefully remove the O-ring from its groove in the cap. A small niche is provided at the groove for placement of the tool.

  Do not to scratch the metal surface of the chamber cap. Scratches could result in an imperfect seal.
  1. Clean the groove in the chamber cap using a small brush or lint-free tissue moistened with isopropyl alcohol.
  2. Allow the chamber cap to dry thoroughly.
  3. Use a small drop of Dow Corning high vacuum grease (or equivalent).
  1. Grasp the O-ring with the two greased fingers. Distribute the grease evenly and completely around the O-ring.

  Apply the grease sparingly. Too much grease may alter cell volume while too little grease results in an imperfect seal and leaks.
  1. Place the O-ring back into the groove on the cap and, with the greased index finger, gently press it back into position.
  2. Ensure the O-ring groove is properly greased. See Grease the Chamber Cap O-Ring.
  3. Replace the chamber cap.
 
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