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

NDV Series

Cost-effective vapor-cooled nitrogen dewar operating from 50 K to 70 K

The NDV line of nitrogen dewars contain a single cryogenic vessel. A vapor-cooled radiation shield surrounds the vessel and the cold work surface. The guard vacuum of the dewar is enhanced by a molecular sieve “getter” which is mounted to the cold work surface. Larger sizes, including rectangular extensions, are available upon special request.

Applications:

NDV systems are frequently used for near-IR detector and camera systems including CCD, HgCdTe, and InSb. Applications include materials and electronic component testing.

Features:

  • Operating temperature range: 50 K to 77 K (with low temperature modification)
  • Open cycle operation
  • Vapor cooled radiation shield
  • Molecular sieve “getter”
  • Standard work surface diameters (in/cm): (3.00/7.62, 5.00/12.70, 8.00/20.32, 10.00/25.40, 12.00/30.48, 14.00/35.56)
  • Customizable configuration including size
HDV

HDV Series

Efficient vapor-cooled helium dewar operating from 1.8 K to 4.2 K

The helium dewars in the HDV line contain a single cryogenic vessel. A vapor-cooled radiation shield surrounds the vessel and the cold work surface. All interior dewar surfaces are lined with metal foil to provide additional shielding. Larger sizes, including rectangular extensions, are available upon special request.

Applications:

HDV systems are frequently used for mid- and far-IR detector and camera systems including bolometers, photo detectors, HgCdTe, and InSb. Applications include materials and electronic component testing.

Features:

  • Operating temperature range: 1.8 K to 4.2 K
  • Open cycle operation
  • Vapor cooled radiation shield
  • Multiple layers of shielding foil
  • Standard work surface diameters (in/cm): (3.00/7.62, 5.00/12.70, 8.00/20.32, 10.00/25.40, 12.00/30.48, 14.00/35.56)
  • Customizable configuration including size
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

NDL Series

Cost-effective vapor-cooled nitrogen dewar operating from 50 K to 70 K

The NDL line of nitrogen dewars contain dual liquid nitrogen cryogenic vessels. A liquid-cooled radiation shield surrounds the inner vessel and the cold work surface. The guard vacuum of the dewar is enhanced by a molecular sieve “getter” which is mounted to the cold work surface. Larger sizes, including rectangular extensions, are available upon special request.

Applications:
NDL systems are frequently used for near-IR detector and camera systems including CCD, HgCdTe, and InSb. Applications include materials and electronic component testing.

Features:

  • Operating temperature range: 50 K to 77 K (with low temperature modification)
  • Open cycle operation
  • Liquid cooled radiation shield for very low background radiation
  • Extended inner vessel hold times.
  • Molecular sieve “getter”
  • Standard work surface diameters (in/cm): (3.00/7.62, 5.00/12.70, 8.00/20.32, 10.00/25.40, 12.00/30.48, 14.00/35.56)
  • Customizable configuration including size
HDL

HDL Series

Proven performance in a liquid-cooled helium dewar operating from 1.6 K to 4.2 K

The helium dewars in the HDL line contain two cryogenic vessels. The LN2 vessel directly cools a radiation shield that surrounds the LHe vessel and the cold work surface. All interior dewar surfaces are lined with metal foil to provide additional thermal shielding. 

Applications:
HDL Systems are frequently used for mid- and far-IR detector and camera systems including bolometers, photodetectors, and InSb. Applications include materials testing, electronic component testing, and the cooling of entire stand-alone instruments.

Features:

  • Operating temperature range: 1.6 K to 4.2 K (with low temperature modification)
  • Open cycle operation
  • Standard 3 to 14 inch (7.5 to 35cm) diameter cold plates
  • Liquid cooled radiation shield
  • Multiple layers of radiation shielding
  • Standard work surface diameters: (in/cm): (5.00/12.70, 8.00/20.32, 10.00/25.40, 12.00/30.48, 14.00/35.56)
  • Customizable configuration including size
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

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