Replace the Sample Tube O-ring

It is important to maintain a vacuum-tight seal near the top of the sample tube stem. If an O-ring becomes worn or cracked, it does not provide a good seal and will need to be replaced.

  Before removing (or installing) a sample tube, ensure that the port valve is closed. Observe the analyzer schematic to verify valve status.
  1. Carefully remove the dewar from the elevator. Take care not to bump the sample tube bulbs with the dewar during this process. Place the dewar aside.
  1. Hold the sample tube firmly with one hand and loosen the sample tube connector nut by turning counter-clockwise.
  Do not allow the sample tube connector nut to drop onto the sample tube bulb as it may break the tube.
  1. Carefully pull the sample tube down until it is free from the port. It may be necessary to grasp the sample tube with both hands.
  1. Remove the O-ring from the top of the sample tube and replace it with a new one.

  If the O-ring remains inside the sample port, use a pair of tweezers or needle-nose pliers to remove it.
  1. While holding the connector nut in place, slide a new O-ring over the sample tube, about 1/4 in. from the top of the tube.

  1. After the new O-ring is in place, insert the sample tube back into the sample port until it is fully seated.
  2. Slide the sample tube connector nut up the tube until it comes in contact with the port fitting (the ferrule and O-ring will move along with the connector nut). Then, turning clockwise, hand tighten the connector nut to the sample connector.
 
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