Fill and Install the Dewar
- Fill the Dewar with the analysis bath liquid (such as liquid nitrogen) to no higher than 1 in. (2.5 cm) from the top for a large Dewar or no higher than 3/4 in. (2 cm) from the top for a smaller Dewar.
Incorrect fluid levels can lead to measurement errors. Check the level of the bath liquid before each analysis. |
- Check the level of the analysis bath liquid. 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.
- Slide the Dewar cover to approximately 7.5 cm (3 in.) from the sample port nuts to ensure a proper seal on the top of the Dewar.
- Place the Dewar on the elevator. A Dewar support is not necessary for the larger Dewar used with the Gemini 2390t. Place the Dewar directly on the elevator.
- Close the safety shield on the front of the analyzer.
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