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. |
- 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.
- 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. |
- 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.
- 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. |
- 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.
- After the new O-ring is in place, insert the sample tube back into the sample port until it is fully seated.
- 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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