CryoTel® GT User’s Manual Version 6 P a g e | 8
Figure 5: Cold Tip ¼”-20 Threaded Hole
VI. Cold End Vacuum
The cold finger of the CryoTel
®
GT operates best in an insulated vacuum. The vacuum eliminates possible
loading of the cold finger from convection or condensation of elements in the atmosphere such as water
vapor and nitrogen. The vacuum is created by a customer provided vacuum Dewar or cryostat. As
previously noted a flange can connect the cryostat and the stainless steel vacuum flange with an O-ring
seal or welded attachment (Fig 4).
When using a mechanical vacuum pump it is appropriate to seal the flange with an O-ring and clamp.
The vacuum pump will remove any residual gasses released by the O-ring and continue to maintain a
vacuum inside the cryostat. However, an O-ring may corrode and become brittle over an extended
period of time.
For customer applications requiring long-term vacuum without using a vacuum pump, it is
recommended that the cryostat be welded to the CryoTel
®
vacuum interface.
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