Liquid Nitrogen Dewar
Cryogenic storage dewars are specialized vacuum flasks that hold liquid nitrogen or liquid helium (cryogens). Choosing the right dewar that best suits your application is critical. A liquid nitrogen dewar should have the shape, capacity, and material construction to store your sample. Look for dewars that feature high performance construction and advanced insulation materials to ensure high thermal efficiency.
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For phosphorescence or delayed fluorescence measurements, it is sometimes desirable to cool samples to liquid-nitrogen temperature. The FL-1013 LN dewar accessory enables these measurements with Fluorolog and FluoroMax systems.
The sample is placed in the quartz cell which is then immersed in the liquid-nitrogen-filled dewar. A Teflon cone in the bottom of the dewar keeps the quartz sample-tube centered. The portion of the dewar which is in the light path is constructed of fused silica to preserve the UV measurement capabilities of the instrument. A Teflon cover on the top of the dewar captures any excess liquid nitrogen that bubbles out of the assembly. A pedestal holds the dewar in the sampling module.
Also included is a “stove-pipe” sample cover that allows LN to be added as needed.
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