LHe cryostats with head flange
LHe bath cryostats (Dewar flasks) are made of borosilicate glass 3.3 in accordance with DIN/ISO 3585 (DURAN) and are designed for use with liquid helium.
As borosilicate glass 3.3 (DURAN) is not helium diffusion-tight, glass cryostats must be designed in such a way that they can be post-evacuated. A glass flange NW 25 with associated clamp and O-ring is used as a standard vacuum connection, so that the connection to the vacuum pump can be made with small metal flange components.
On request, a vacuum glass tap or a bonded metal flange can also be offered as a pump flange. The cryostats have a bulkhead flange with an O-ring groove as the head flange.
All helium cryostats are manufactured exclusively to customer order. Changes to dimensions, connections or volumes can usually be made at no additional cost. The LHe cryostats listed in the table correspond to the most common dimensions and volumes. LHe cryostats are supplied with opposing viewing strips as standard. Of course, the cryostats can also be offered with a visible strip or fully silver-plated.
Free inside diameter at the head flange
Head flange
| NW 60 | 57 mm |
| NW 100 | 97 mm |
| NW 120 | 117 mm |
| NW150 | 147 mm |
| NW 200 | 197 mm |
Technical data
| Type | D.I. [mm] | D.A. [mm] | H.I. [mm] | Head flange | H.F. [mm] | 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 |