Sample Tube O-ring Replacement

 

The equipment images in this topic may differ slightly from your equipment; however, the instructions are the same unless otherwise noted.

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.

 

Do not allow the sample tube connector nut drop onto the bottom of the tube as it may break the tube.

Use the proper size frit for the sample port. The analyzer will not operate properly if an incorrect size is used.

  1. Carefully remove the Dewar from the analyzer. 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, loosen the sample tube connector nut by turning counter-clockwise.
  2. 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. Sample tube or balance tube
  2. Connector nut
  3. O-ring
  4. Ferrule
  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 the O-ring removal tool from the accessory kit [tool part number 004-54618-00] or use a pair of tweezers or needle-nose pliers to remove it.
  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.