Specifications

Operating Manual Freeze Dryer ALPHA 1-4 LD-2 / 2-4 LD-2, Version 0203, Page 37
If shock-freezing is required we recommend that freezing is carried out in liquid
nitrogen or in a cooling bath.
The ampoule is then connected to the hose and the hose clamp is removed. Thus the
partial pressure in the ampoule is suddenly decreased and a partial thawing during the
evacuation process is avoided.
With this procedure one ampoule after the other is connected.
Sealing of the ampoule is carried out in the same way. The hose of the ampoule to be
sealed is clamped and the ampoule is sealed under vacuum using the blow lamp.
If the ampoule breaks during sealing the vacuum in the drying chamber is not affected
due to the clamping with the hose clip.
The remaining glass from the ampoule is removed and the hose is closed with a
dummy plug.
In this way one ampoule after the other can be sealed or new ampoules can be
connected.