Operating Manual Freeze Dryer
ALPHA 1-4 LD-2 / 2-4 LD-2
, Version 0203, Page 36
5.3
Freezing Separately and Drying of Flasks
Possible water residue is removed from the ice condenser chamber. The defrosting
water valve is opened and closed again so that the water residue can be drained. The
ice condenser chamber should be wiped if necessary.
For pre-cooling the ice condenser the
ALPHA 1-4 LD-2 / ALPHA 2-4 LD-2
is switched
on.
For drying outside of the ice condenser chamber different manifolds are available (see
accessory catalogue). The drying chamber with 8 connections is mounted on the
sealing ring on the bottom plate of the
ALPHA 1-4 LD-2 / ALPHA 2-4 LD-2
. Manifolds
with standard ground joints NS 45/40 are connected via the ground-in socket of the
acrylic chamber.
In order to ensure a vacuum-tight connection and to simplify removal of the manifolds
the ground-in surface must be slightly greased with vacuum grease before use. The
manifold is then put on and turned by 360
°
for even distribution of the grease.
Before the vacuum pump is switched on it is necessary to check that all valves are
closed.
CAUTION! The frozen samples cannot be connected to the valves until a pressure of
less than 1.030 mbar is reached.
Liquids are frozen in flasks according to the shell-freezing principle, manually or with a
turning device. Due to this freezing process the layer thickness is reduced and the
drying period is considerably shortened.
The rubber valves allow a continuous connection and removal of flasks during the
drying process. Each rubber valve is equipped with a separation and venting device.
If the rubber valves are stiff they must be dismantled, cleaned, slightly greased with
vacuum grease and reassembled.
Using a distributor a maximum of 15 ampoules can be simultaneously frozen in the
cooling bath and connected to the manifold.
5.4
Freezing Separately and Drying of Ampoules
Using a Manifold
The manifold is equipped with dummy plugs for connection of max. 48 ampoules so
that it can be pre-evacuated.
The first hose is clamped in the middle with the supplied hose clamp and the blind plug
is removed. The vacuum is preserved in the system.
The liquid in the ampoule is either frozen in a deep-freeze or under rotation in a cooling
bath.
Summary of Contents for 101041
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