Preventive Maintenance TriStar II 3020
9-6 302-42828-01 - Dec 2012
Replacing 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.
1. Holding the sample tube firmly with one hand, loosen the sa
mple tube connector nut by turning
counterclockwise.
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.
3. Remove the O-ring from the top of the sample tube and replace it with a new one.
4. After the new O-ring is in place, insert the sample tube back into the sample port until it is fully
seated.
Before removing (or installing) a sample tube, ensure that the port valve is closed.
Observe the instrument schematic to verify valve status.
Be careful not to let the sample tube connector nut drop onto the bottom of the tube as
it
may break the tube.
Be sure to use the proper size frit for the sample port. The instrume
nt will not operate
properly if the incorrect frit size is used.
If the O-ring remains inside the sample port, use a pair of tweezers or needle-nose
pliers to remove it.
O-ring
Ferrule
Connector nut
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