Fill and Install the Dewar

Dewar Covers

Dewar insulators cover the opening in the top of a dewar.These covers help maintain the purity of the liquid cryogen, as well as preventing objects from falling into the dewar.

When a dewar is not in use, lower the dewar elevator and cover the top of the dewar with an insulator.

Fill the Dewar

  1. Fully lower the elevator.
  2. Fill the analysis dewar with analysis bath liquid to approximately 5 cm from the top of the dewar. 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 into the dewar 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. Attach the safety shield to the brackets on the front of the analyzer.