D39374 | Date 08/2018 13
Design and description
2.6.2 Fresh air, inert gas and vacuum connection
At the left rear post are the
connections for the inlet of fresh
air or inert gas (optional) and the
connection for the vacuum
pump (DN 16 KF, Fig. 4 and Fig.
5).
Fresh air
The fresh air connection has two
functions. On the one hand,
the device is ventilated via the
connection and thus the nega-
tive pressure is adapted to the
atmospheric pressure. On the
other hand, the connection is
opened by the appliance con-
troller for a very short time in
order to fine-tune the negative
pressure.
Inert gas (optional)
By applying inert gas to the working chamber, a protective atmosphere can be created
which protects the load from contact with ambient air.
Vacuum
The vacuum connection is designed as an ISO-KF connection of size DN 16. Either the
supplied pump module or another suitable external vacuum pump are connected to it.
When using an external vacuum pump, make sure that the pump is suitable for the ma-
terial being fed and the desired process.
Required parameters of a suitable pump:
► Pumping speed > 30 Nl/min
► Final vacuum ≤ 3 mbar
► chemical-resistant version
► temperature resistant (exhaust gas temperature like working temperature)
1
2
3
Fig. 4 Connections
on the back of VO 49
Premium and VO 101
Premium appliances
1 Fresh air supply
2 Inert gas connection
3 Vacuum pump con-
nection
1
2
3
Fig. 5 Connections
on the back of VO 29
Premium units and all
standard appliances
1 without function
(blanking plug)
2 Fresh air supply
3 Vacuum pump con-
nection
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