Fill and Install the Dewar

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

  1. Fill the dewar with the analysis bath liquid (such as liquid nitrogen) to no higher than 2 1/4 in. (5.7 cm) from the top. Filling the dewar higher than this will cause an error in the free space measurement.
  Incorrect fluid levels can lead to measurement errors. Check the level of the bath liquid before each analysis.
  1. Insert the dipstick and check the level of the analysis bath liquid. Condensation should not exceed the level indicator mark.

  1. For best results, if the dewar has not been used for a while, allow approximately 30 minutes for the temperature of the dewar to stabilize with the bath liquid, then recheck the level of the bath liquid. Add additional liquid if necessary.
  2. Slide the dewar cover to approximately 3/4 in. (19 mm) from the sample port nuts to ensure a proper seal on the top of the dewar.
  3. Place the dewar on the elevator.
  4. Attach the safety shield to the brackets on the front of the analyzer.

 
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