Check and Clean the Dewar
When handling dewars, follow the precautions outlined in Dewar Precautions. |
Always handle glass dewars with care. Any product incorporating a vacuum is a potential safety hazard and should be treated with caution. If in doubt, contact your safety officer. |
Ice and suspended frost particles may accumulate in the bottom of the analysis port dewar. Particles or deposits exceeding 1/4 in. in depth may jam between the bottom of the sample tube and the bottom of the dewar
To ensure problems do not develop due to ice accumulation, check the dewar after each use. Clean on a weekly basis.
- Remove the dewar from the analyzer.
- Pour out liquid nitrogen into an appropriate cryogenic container. Do not re-use liquid nitrogen.
Do not pour liquid nitrogen directly into a sink. Doing so may cause drain pipes to burst. |
- Rinse the dewar with warm water to melt any remaining ice accumulation which may remain. Dry thoroughly.
- Replace the dewar.
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