L–N2 Vacuum Jacketed Coolant Delivery Hoses

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Vacuum jacketed hoses are the ideal choice for delivery of L–N2. Internally insulated by a layer of vacuum between the inner and outer convoluted tubes, these hoses do a superior job of protecting the L–N2 inside from heat intrusion. Lowered heat intrusion results in the hose being more consistently able to deliver liquid phase, rather than gas phase, nitrogen to the thermal platform or temperature chamber. The benefits: Faster, more consistent tests, and lower operating cost.

L–N2 Hoses

Vacuum jacketed hoses are expensive, but are the long term winners for the lowest total cost of ownership because of their high performance and exceptionally low coolant losses to ambient heat. Because of their superior built-in insulating qualities, these hoses deliver liquid phase Nitrogen faster, and more consistently. Nitrogen consumption and test times are reduced, and temperature control is improved.

Sigma Vacuum jacketed L–N2 hoses have the correct fittings to connect any standard L–N2 Dewar (CGA–295 fitting) to any standard Sigma temperature chamber or thermal platform. The inner core of these hoses is 1/4”, 3/8", or 1/2" I.D. convoluted superflex stainless steel with a surrounding layer of braided woven stainless steel for strength, a Mylar super insulation layer, a superflex convoluted outer tube to make a vacuum hose, another layer of braided woven stainless steel for strength and a stainless steel armored covering. The small inner diameter of these super flexible hoses reduces the volume of L–N2 that is exposed to ambient heat influences by 75% assuring the fastest possible delivery of liquid phase Nitrogen to the cooling process. The O.D. of Sigma Vacuum jacketed hoses is the smallest in the industry. The great flexibility allows the hose to be more easily positioned and substantially reduces the strain on inlet fittings, filters, and valves. Sigma Vacuum jacketed hoses are ideal for longer hose lengths, continuous use, and anytime that long term total cost of ownership is really considered. Every Sigma Vacuum jacketed superflex hose is fitted with a safety pressure relief valve so that liquid trapping is not an issue. Because the entire hose is insulated by a very deep vacuum between the convoluted hose tube layers, condensation is not a problem.

 

Sigma Vacuum Jacketed Hoses 
Length Feet Length Meters 1/4" Nom ID
Item Number		 3/8" Nom ID
Item Number		 1/2" Nom ID
Item Number
4 1.2 36110 36604 36654
6 1.8 36114 36606 36656
8 2.4 36118 36608 36658
10 3.0 36122 36610 36660
12 3.7 36126 36612 36662
15 4.6 36132 36615 36665
20 6.1 36142 36620 36670
25 7.6 36145 36625 36675
 
Hose nominal OD 1 3/8" 2 1/8" 2 3/8"
Outlet fitting 1/4" female 
SAE flare swivel		 3/8" female 
SAE flare swivel		 1/2" female 
SAE flare swivel
Outlet fitting compatibility Sigma Standard  Available on some Sigma chambers Available on some Sigma chambers
Dewar connection CGA295 CGA295 CGA295
Lead Times Call for Lead Times Call for Lead Times Call for Lead Times

*  Please note that most Sigma chambers and platforms are equipped with a 1/4" SAE connector. Please confirm the size of the connector on your unit before ordering hoses.

To learn more about Cryogenic Cooling, hoses, and Accessories read Sigma's
"Cryogenic Cooling for Temperature Chambers and Thermal Platforms - Explained and Demystified"

We recommend using the shortest length and smallest ID diameter hose that matches your chamber/platform, L–N2 
or L–CO2 source, and cooling needs to reduce heat absorption by the coolant in the hose.

To prevent metering valves and filter from becoming fouled by tape shards, always use Teflon paste sealant... never Teflon tape... when installing cryogenic coolant plumbing.
 

 

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