Micromeritics TRISTAR II PLUS Operator's Manual page 102

6 Perform an Analysis
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.
2. Hold the sample tube firmly with one hand, loosen the sample tube connector nut by turning
counter-clockwise.
3. 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.
4. 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.
5. After the new O-ring is in place, insert the sample tube back into the sample port until it is
fully seated.
6. 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.
6 - 10
A. O-ring
B. Ferrule
C. Connector nut
303-42800-01 (Rev M ) — Sep 2023
TriStar II Plus Operator Manual