Highly efficient dewars for liquid nitrogen and other cryogens offer cryogen use, long hold times, and multi-application flexibility. We provide high efficiency liquid nitrogen (LN2) dewars for 77 to 50 K and liquid helium (LHe) dewars for 4.2 to 1.6 K. Standard open cycle dewar sizes range from 3 to 14 inch (7.5 to 35cm) in diameter. Our dewars are designed for efficient cryogen use, long hold times, and user flexibility to configure the dewar for more than one specific application or test.
Dewar Product Comparison
Dewars Comparison Table | Nitrogen Dewars | Helium Dewars | ||
---|---|---|---|---|
Series Name | NDV | NDL | HDV | HDL |
Vessels | Single | Dual | Single | Dual |
Operating Temp (K) with Vapor Pressure = 1 ATM | 77 | 77 | 4.2 | 4.2 |
Low end operating temperature (K) when pumping on liquid bath to reduce vapor pressure < 1ATM | < 55 | < 55 | 1.8 | 1.6 |
Diameters of Cold Work Surface (inches) | 3, 5, 8, 10, 12, 14, 16 | 3, 5, 8, 10, 12, 14, 16 | 3, 5, 8, 10, 12, 14, 16 | 3, 5, 8, 10, 12, 14, 16 |
Liquid Cooled Radiation Shield | NO | YES | NO | YES |
Vapor Cooled Radiation Shield | YES | NO | YES | NO |
NDV/HDV Series Specification Table | NDV/HDV-3 | NDV/HDV-5 | NDV/HDV-8 | NDV/HDV-10 | NDV/HDV-12 | NDV/HDV-14 |
---|---|---|---|---|---|---|
Dewar Outside Diameter (inches) | 4.95 | 6.95 | 9.95 | 11.95 | 13.75 | 15.95 |
Dewar Height (inches) | 11.38 | 11 | 10.16 | 11 | 11.25 | 11.25 |
Cold Plate Diameter (inches) | 3.12 | 5.12 | 8.12 | 10.18 | 12 | 14.18 |
Work Area Height- “B” Dimension (inches) | 1.5 | 1.5 | 1.5 | 2 | 2 | 2 |
Weight (pounds) | 7.5 | 10.75 | 22 | 36 | 48 | 61 |
LN2/LHe Capacity (L) | 0.5 | 1.2 | 2.6 | 4.4 | 6.4 | 8.7 |
LN2/LHe Hold Time – Standard Supports (hrs) | 24/6 | 72/18 | 90/24 | 115/30 | – | – |
LN2/LHe Hold Time – Rigid Supports (hrs) | – | 70/6 | 80/10 | 106/12 | 120/14 | 143/16 |
NDL/HDL Series Specification Table | NDL/HDL-5 | NDL/HDL-8 | NDL/HDL-10 | NDL/HDL-12 | NDL/HDL-14 |
---|---|---|---|---|---|
Dewar Outside Diameter (in/cm) | 6.95/17.65 | 9.95/25.27 | 11.95/30.35 | 13.70/34.80 | 15.95/40.51 |
Dewar Height (in/cm) | 12.50/31.75 | 12.31/31.27 | 13.50/34.29 | 13.75/34.93 | 13.75/34.93 |
Cold Plate Diameter (in/cm) | 5.125.12/13.00 | 8.12/20.62 | 10.18/25.86 | 12.00/30.48 | 14.18/36.02 |
Work Area Height – “B” Dimension (in/cm) | 1.50/3.81 | 1.51.50/3.81 | 2.00/5.08 | 2.00/5.08 | 2.00/5.08 |
Weight without cryogens (lbs/kg) | 15.75/7.16 | 26.00/11.82 | 26.00/11.82 | 54.00/24.55 | 68.00/30.91 |
LN2 Capacity (L) | 0.8 | 2.3 | 4.2 | 6.1 | 8.4 |
LN2 Hold Time – Standard Supports (hours) | 30 | 30 | 35 | – | – |
LN2 Hold Time – Rigid Supports (hours) | 20 | 27 | 32 | 48 | 60 |
LHe Capacity (L) | 1.2 | 2.6 | 4.4 | 6.6 | 8.7 |
LHe Hold Time – Standard Supports (hours) | 90 | 100 | 135 | – | – |
LHe Hold Time – Rigid Supports (hours) | 25 | 30 | 47 | 55 | 78 |