Binder vdl 115, Operating Manual

Page: 59 / 207

VDL (E3.1) 06/2020 Page 59/206
6.3 Connecting compressed air / inert gas supply for sweeping the area for
electrical equipment and controller housing
The compressed air flows through the area for electrical equipment and the controller housing, which
prevents a possible concentration of a solvent-containing atmosphere in the presence of live electrical
components.
You can alternatively connect inert gas or nitrogen to the com-
pressed air connection. Use only dry gas.
In order to avoid that any oil coming from the compressed-air pip-
ing enters the vacuum drying oven, the compressor of the com-
pressed air system must be equipped with an oil separator, or the
compressed air system must be constructed oil-free.
Connection:
Before commissioning, the pressure regulator on the rear of the
chamber must be connected to a compressed air line (com-
pressed air system) or to an inert gas supply.
Connection: Plug-in coupling for DL quick coupling NW5
There must be an overpressure of at least 1.5 bar /
44.3 inHg
in
the supply network.
The maximally permitted pressure is 16 bar.
Figure 12: Compressed air connec-
tion on the pressure regulator
If solvent-containing air penetrates the electrical area of the chamber, explosions may result.
DANGER
Explosion hazard by solvent-containing air penetrating the electrical area of the
chamber
Serious injury or death from burns and / or explosion pressure.
∅
Make sure that the air for the compressed air supply is NOT taken from explosive at-
mospheres.
Do NOT start the VDL vacuum drying oven when the chamber is not connected to the com-
pressed air supply, or if the specified overpressure is not reached.
Notes when using inert gas:
When operating the VDL vacuum drying oven with inert gas, correctly follow the technical ventilation
measures, as described in the DGUV guidelines 213-850 on safe working in laboratories, issued by the
employers’ liability insurance association (for Germany).
During sweeping the area for electrical equipment with inert gas, the chamber is supplied with an oxygen
displacing gas (e.g. N
2
). Inert gases in high concentrations are hazardous to health. They are colorless
and almost odorless and therefore practically imperceptible. Inhalation of inert gases can cause drowsi-
ness up to respiratory arrest. When the O
2
content of the air decreases below 18%, there is risk of death
from lack of oxygen. Any gas that might escape has to be led out via good room ventilation or a suitable
exhaust system.