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Coolant delivery hoses are used to connect your temperature chamber or thermal
platform to your coolant source, be it a bulk system, a Dewar, or a high
pressure cylinder. Sigma offers Vacuum jacketed and Armored hoses for L–N2
, as
well as hoses for L–CO2
.
2Hoses
2Vacuum jacketed hoses provide the best performance with the lowest losses. Because heat intrusion from the ambient environment is kept to a minimum by the vacuum insulating layer, liquid phase nitrogen is delivered more quickly. This improved liquid delivery results in smoother tests with less temperature oscillation as the controller spends less time coping with changing nitrogen delivery conditions. Over time, the better insulating qualities of a Sigma Vacuum jacketed hose will pay for its extra cost through reduced nitrogen consumption.
L–N2
Armored hoses are less expensive than vacuum jacketed hoses. Armored
hoses require, and are supplied with, foam insulation. Armored hoses are a
reasonable substitute for Sigma Vacuum jacketed hoses where tests are run infrequently
or where Vacuum jacketed hoses are not in the budget.
2Hoses
2hoses fit both "low pressure" refrigerated Dewars and "high pressure" siphon cylinders. Order a hose with insulation for low pressure L–CO
2, without insulation for use with high pressure, room temperature siphon cylinders. Supplied with Dewar/tank fitting gaskets. Extension hoses are available for longer runs using high pressure.
Getting the right hose, with the right fittings, in the right size, with the
right insulation, with the proper safety facilities, is essential for a
successful and safe operation. Sigma hoses come with the correct fittings for
both the coolant source and the temperature chamber or platform. L–N2
hoses
include a Safety Pressure Relief Valve.
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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