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VD (E3.1) 10/2020 page 32/179
4.5 Connecting inert gas supply
When operating the VD 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).
When operating 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 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
Risk of suffocation by inert gas in a high concentration.
Death by suffocation.
∅ Do NOT set up chambers in non-ventilated recesses.
Ensure that technical ventilation measures are activated.
Respect the relevant regulations for handling inert gases.
When decommissioning the vacuum drying oven, turn off the inert gas supply.
Connect the inert gas supply to the universal connection for inert gas / ambient air (adapter with hose
olive diameter 8 mm / 0.31 in) via a pressure reducer. Screw the enclosed adapter with hose olive on the
thread (4) at the chamber rear. Set the pressure reducer to a pressure slightly above ambient pressure.
Ensure that the pressure reducer will certainly open. Do not alter this setting in order to avoid perturbation
inside the oven and release of big quantities of inert gas after flooding the VD.
NOTICE
Danger of perturbations by overpressure in the inner chamber.
Perturbation of the load.
∅ DO NOT change the setting of the atmospheric pressure.
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