4.2.3 Electrical vacuum valve
All models are equipped with an electrical vacuum valve. It is operated via a switch located on the
front of the cabinet.
Do not open the vacuum valve until the AWO-indicator is green.
4.2.4 Drain valve
The drain valve is placed on the front of the cabinet. After de-icing or cleaning of the ice condenser
it can be drained through the drain valve.
A hose may be attached to the nozzle to minimize spillage. Remember to close the drain valve after
use.
5 Operation
The freeze-drying process is a balance between the heat absorbed by the sample to vaporize the
ice, and the heat removed by the condenser to convert the water vapor into ice.
It is important to remember following factors when trying to obtain efficient utilization of the freeze
dryer system.
The efficiency of the freeze-drying process depends upon:
The surface area and the thickness of the sample.
The temperature of the condenser and the vacuum obtained.
The eutectic point (melting temperature) and the concentration of the sample solution.
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