Technical data

4.7. Vacuum pump exhaust gases
During the main drying phase, the separate vacuum pump must be
operated with open gas ballast valve. The oil mist that is produced
is normally trapped in an exhaust filter. If this is not the case, the
oil mist has to be discharged.
A ½" hose can be connected to the exhaust flange of the vacuum
pump RZ-2 or RC-5 and a ¾" hose can be 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 special 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 varying quantities depending on the working
pressure.
The filter is fastened to the exhaust flange of the vacuum pump.
The filter is equipped with a pressure relief valve indicating the
saturation of the filter. The filter cartridge has to be cleaned or
replaced at the latest when the pressure relief valve is activated.
The collected oil is visible in the sight glass and discharged via the
discharging screw.
Since spring 2004, most of the vacuum pumps delivered by
CHRIST have been equipped with an automatic oil recirculation
system. This system reuses the oil separated by the exhaust filter
to feed the pump. A manual removal is no longer necessary.
(Please refer to separate operating manual of the vacuum pump!)
Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC Installation and Commissioning of the Unit • 27