Martin-christ Epsilon 2-6D LSCplus Manuel d'utilisateur télécharger pdf (Page 22)

Freeze-dryer EPSILON 2-6 LSCplus

2 Layout and mode of operation

Version 10/2012, Rev. 1.6 of 16/12/2014 • sb

Translation of the original operating manual

2.2.2.5 End of drying and aeration

The end of the drying process is reached when both the product and shelf

temperature are clearly in the positive range (+15 to +20°C) and if their

difference is not greater than 5 K.

Another indication of the end of the drying process is the behaviour of the

vacuum and of the ice condenser temperature. The ice condenser is no

longer subject to load and reaches the final temperature of approximately -

55°C or -85°C. The pressure in the drying chamber decreases in

accordance with the ice condenser temperature.

The vacuum pump will be switched off and the drying chamber will be

aerated via a rubber valve or via the aeration valve. The aeration valve can

also be used to flood the unit with nitrogen or another inert gas instead of

ambient air.

Then, the product can be removed from the unit.

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2.2.2.6 Defrosting

Defrosting with hot gas

As standard, the freeze-dryer is equipped with a hot-gas defrosting system.

In order to defrost the ice condenser, heated refrigerant is fed through the

heating coil. In addition, the bottom of the ice condenser chamber is heated

by way of a heating collar.

In order to avoid damage, the condensate must be drained off through the

media drain valve directly after the completion of the defrosting process.

Then, any residual water must be removed from the ice condenser

chamber by way of a cloth.

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Martin-christ Epsilon 2-6D LSCplus Manuel d'utilisateur Page 22

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