Micromeritics TriStar II 3020 Operator's Manual page 55

TriStar II 3020
For glass Dewars:
• Use a plastic stirring rod when stirring substances in a Dewar containing liquefied gases (or other
materials of extremely low temperature). Do not use a glass or metal stirring rod unless it has a
protective coating.
• Do not remove the mesh covering from the Dewar flask. This covering helps to maintain a secure
grip on the Dewar.
• Do not handle heavy objects above the Dewar. If unavoidable, place a protective cover over the
Dewar's opening. If an object of sufficient weight is accidentally dropped into the Dewar, shattering
may occur.
For stainless steel Dewars:
• Use a plastic stirring rod when stirring substances in a Dewar containing liquefied gases (or other
materials of extremely low temperature).
• Do not handle heavy objects above the Dewar. If unavoidable, place a protective cover over the
Dewar's opening.
To install the analysis Dewar:
1. Place the analysis Dewar onto the elevator.
2. Fill the Dewar with the analysis bath liquid (liquid nitrogen) to about 5 cm (2 in.) from the top.
Incorrect fluid levels can lead to measurement errors. Check the level of the bath liquid
before each analysis.
3. Insert the dipstick into the Dewar and check the level of the analysis bath liquid. Condensation
should not exceed the Level Indicator mark.
302-42828-01 - Dec 2012
Preparing for Analysis
Level indicator mark
Wetness or frozen 
condensation indicates
bath liquid level
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