LHe Glass Cryostats With Head Flange

LHe bath cryostats (Dewar flasks) are made from DURAN borosilicate glass 3.3 in compliance with DIN/ISO 3585 and have been designed for the use of liquid helium.

Glass cryostats must be designed so that they can be re-evacuated, as DURAN borosilicate glass 3.3 is not helium-tight. The standard vacuum connection used is an NW25 glass flange with clamp and O-ring, which makes it possible to establish the connection to the vacuum pump using small flange components made from metal. Upon request, a vacuum glass tap or a glued-on metal flange can be delivered as a pump flange. The top flange of the cryostats is a Schott flange with an O-ring groove.

The helium cryostats are only made to order. Changes as to the dimensions, connections or volumes can usually be made at no extra charge. The LHe cryostats listed in the table correspond to the most common dimensions and volumes. The standard LHe cryostats come with opposing viewing strips. The cryostats can also be delivered with one viewing strip or fully silvered.

Free Diameter Inside The Head Flange

NW 60 = 57 mm
NW 100 = 97 mm
NW 120 = 117 mm
NW 150 = 147 mm
NW 200 = 197 mm

Technical Data

Type D.I. D.A. H.I. Head
Flange
H.F. Volume
[l]
LHC 1-F 60 80 900 NW60 950 2,0
LHC 2-F 70 90 900 NW60 950 3,0
LHC 3-F 80 105 900 NW60 950 4,0
LHC 4-F 99 120 900 NW100 960 6,0
LHC 5-F 104 130 900 NW100 960 7,0
LHC 6-F 124 150 900 NW120 960 9,5
LHC 7-F 136 160 900 NW150 975 11,5
LHC 8-F 158 185 900 NW150 975 15,5
LHC 9-F 200 230 900 NW200 975 25,0
Details