Technical data

In order to seal the bottles, the shelf must be completely filled. For
small quantities, at least three spacers must be distributed evenly
on each shelf (according to the height of the bottles with inserted
rubber stoppers).
Suitable spacers are available upon request.
3.2. Separate freezing and drying outside the ice
condenser chamber (process B) on
temperature-controlled shelves
The product can also be dried outside the ice condenser chamber.
In this case, the product has to be frozen first, e.g. in a deep-
freeze.
Possible water residue is removed from the ice condenser
chamber. The drain valve is opened so that the water residue can
drain off. The ice condenser chamber should be wiped out if
necessary.
The refrigeration unit and the vacuum pump are activated via the
control system to pre-cool the ice condenser and to warm up the
vacuum pump. The valve is closed during the warm-up of the
vacuum pump. In case the unit is not equipped with an
electromagnetic pressure control valve, we recommend using a
manual stop valve. Without such a valve, the vacuum pump
cannot be warmed up.
The rack is set onto the base plate or onto the intermediate valve
with a base plate. In the case of small samples, it is recommended
to pre-cool the shelves in order to avoid partial thawing during the
evacuation.
The heating current is supplied to the shelves via two connection
cables with banana plugs. The connection cables are plugged into
the two sockets of the electrical leadthrough and into the holes in
the rack or in the sealing device.
20 • Description of the Freeze Drying Processes Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC