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VDL (E3.1) 10/2020 Page 21/196
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 (for Germany).
Do not start up the chamber without active technical ventilation .
During operation 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 prac-
tically imperceptible. Inhalation of inert gases can cause drowsiness 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.
DANGER
Suffocation hazard due to high concentration of inert gas.
Death by suffocation.
∅ Do NOT set up chambers in non-ventilated recesses.
Make sure that technical ventilation measures are active.
Respect the relevant regulations for handling inert gases.
When decommissioning the vacuum drying oven, shut off the inert gas supply.
If solvent-containing air penetrates the electrical area of the oven or the preheating chamber, explosions
may result.
DANGER
Explosion hazard by solvent-containing air penetrating the electrical area of the
oven or the preheating chamber.
Serious injury or death from burns and / or explosion pressure.
∅ Do NOT take the air, which will be used to supply the chamber with compressed air,
from a potentially explosive atmosphere.
∅ Ensure that the operator compressed air supply line is equipped with active monitoring
of the defined inlet pressure.
The unit must not be operated without compressed air flushing at maximum overpressure and
running compressed air flushing with active monitoring of the defined inlet pressure.
Avoid the solvent accumulation in the optional pump module as this would cause the vacuum
module to become an occasionally or continuously / for long periods / frequently potentially ex-
plosive area (Zone 0 or 1). The VDL vacuum drying oven located on top of the module is im-
plemented in Device category 3 in regards to its surroundings.
DANGER
Explosion hazard due to operating the oven with material containing solvent that
may be able to form an explosive mixture with air.
Serious injury or death from burns and / or explosion pressure.
Follow the measures listed below for operation with solvent-containing materials that
can form an explosive mixture with air.
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