Martin-christ Beta 2-8 LDplus User Manual download pdf (Page 32)

32  Installation and Commissioning of the Unit Operating Manual Freeze Dryer BETA 1-8 LDplus / BETA 2-8 LDplus

4.4. Checking the Earth Connection

For checking the earth connection there is a screw for equalising

the ground potential on the back panel of the freeze-dryer. The

check can be carried out by means of an appropriate measuring

device.

4.5. Aeration

The aeration and drain valve at the lower left side of the unit is

used to vent the ice condenser chamber.

In case penicillin bottles have to be sealed under nitrogen instead

of vacuum, the ice condenser chamber can be flooded with

nitrogen via the nozzle of the aeration valve.

CAUTION! Max. 0.2 bar overpressure!

4.6. Condensate and Defrosting Water

The condensate and defrosting water is drained via the aeration

and drain valve on the lower left side of the unit. To drain the

water, connect the hose supplied with the unit to the nozzle. The

condensate and defrosting water are collected in a vessel.

The condensate and defrosting water can also be drained directly

via this hose. The condensate and defrosting water must be able

to drain freely. To achieve this, the hose must have a steady

downward slope. It must be ensured that water does not collect in

any part of the hose. The end of the hose always has to be above

the level of the liquid in the vessel for the discharged liquids.

Otherwise there is the risk of water and dirt residues being sucked

into the ice condenser chamber if there is a negative pressure

when opening the drain valve.

The drain valve is also used to vent the unit when a freeze-drying

process has been completed.

4.7. Vacuum Pump Exhaust

The oil mist which is produced during opferation of the vacuum

pump must be removed.

A ½" hose can be connected to the exhaust flange of the vacuum

pump RZ-2 or RC-5 and a ¾" hose is connected to the exhaust

flange of the vacuum pump DUO 5 or DUO 10. The hose either

leads into the open air or into a vent.

During installation of the pipe care must be taken that condensate

cannot flow back into the pump. With upward leading pipes it is

safest to use a separator (Woulfe's bottle or wash bottle) in the

pipe.

We strictly recommend using an exhaust filter (oil mist separator).

This filter prevents air pollution by oil mist which is emitted by the

vacuum pump in different quantities depending on the working

pressure.

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Martin-christ Beta 2-8 LDplus User Manual Page 32

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