Cryostat Helitran Open Cycle Cryogenic System Model LT-3B cold end

Description

You never have to remove the LT-3B-110 Helitran cold end when baking out your UHV system. We use high temperature brazing materials and internal welds to permit bakeout temperatures up to 200°C. Specify the mating flange size and cold end length to fit your vacuum chamber and we do the rest.

Features Include:

Operates with liquid helium in the 2-300K range; operates with liquid nitrogen in the 77-300K range.
Withstands bakeout temperatures to 200°C.
Optional multi-pin UHV instrumentation feedthroughs.
Operates in any orientation with no loss in performance.
Standard length LT-3B is interchangeable with other Helitran cold ends and transfer lines.
Helium exhaust gas heater prevents frosting on vacuum shroud and reduces the possibility of cryogen burns.
Fiberglass sleeved instrumentation.
Minimum maintenance requirements.
Liquid nitrogen use requires only change of cryogen; Helitran equipment stays the same.
Transfer line available in 6 ft (standard) 8ft or 10ft flexible sections.

Specifications
Net Refrigeration:	0.75 watts at 4.2K 3 watts at 20K 7 watts at 50K
Temperature Range:	2K to 350K
Cooldown Time:	20-40 mins from 300 K Cold start-up: 10-15 min.
Cryogens:	Helium, Nitrogen
Weight:	transfer line: 8lbs (3.6kg) Cold end: 2lbs (0.9kg)
Total Consumption:	Typically 1.5 liters/hr at 4.2K (tip and shield flow); lower at higher temp.
Supply Dewar Compatibility:	Standard 42" dewar depth, 3/8" o.d. neck dia. for direct coupling of line to dewar or 1/2" when dewar adapter sleeve is used. Other deware bayonet lengths available on request
Materials:	Nonmagnetic SS304, OFHC copper, copper, brass and hard and soft solders.
Electrical Characteristics:	Cold Tip heater 36watts, 36 volts DC Vent gas heater 100Watts 115V,
Weight:	Transfer line: 8 lbs ( 3.6 kg ) Cold End: 2lbs ( 0.9 kg )
High Flow Line:	Available for High Refrigeration capacity and faster cooldown (10-20min) 1.5 watts at 4.2K 6.0 watts at 20K 14 watts at 50K

Open Cycle Cryogenic System