Ventilation / Breaking The Vacuum In Case Of A Power Failure - Binder VDL Series Operating Manual

Following evacuation, an inert gas, e.g., nitrogen, is led into the inner chamber via the fine dosing valve
for inert gas (6), until pressure compensation with the atmosphere occurs. Depending on the individual
application, you can perform a second evacuation and repeat the inert gas flooding.
When the inert gas fine dosing valve is open, a maximum of approx. 0.6 m³/h gas flows into the inner
chamber. The introduction of inert gas by under-flooding in the lower region of the inner chamber rear
wall and the extraction at the inner chamber ceiling allow an effective inert gas flushing.
9.9.3

Ventilation / breaking the vacuum in case of a power failure

The emergency ventilation is intended for the case of a completed drying process
To be able to open the chamber in case of a power failure, remove the "Manual ventilation" plug (7) for
emergency ventilation, which is located on the chamber rear.
As long as there is a vacuum, never try to open the oven by force.
Make sure that the drying procedure is complete before breaking the vacuum. Otherwise, you
should wait for the power to return to continue the drying procedure.
Explosion hazard through the formation of an explosive atmosphere in the presen-
ce of hot surfaces.
Serious injury or death from burns and / or explosion pressure.
∅ Do NOT remove the "Manual ventilation" plug, as long as the drying process is still
running.
9.9.4 Ventilation before completing the drying procedure (flooding with ambient air or
inert gas)
If possible, avoid terminating the drying process. If it is nevertheless to be done, it is essential to observe
the following instructions!
Safety during the drying process: The vacuum during drying prevents the presence of an explosive
atmosphere in the interior of the chamber. At the start of the drying process, the heater is therefore only
released at a pressure of100 mbar. In addition, the maximum temperature is limited so that, with correct
load, there is no risk of ignition from hot surfaces.
Error: If incorrect loading with an inadmissible solvent (auto-ignition temperature <200 ° C) has occurred,
proceed as follows
• Disconnect the power plug and turn off the pump.
• Let the chamber cool down to room temperature.
• Do NOT remove the "Manual ventilation" plug.
• Only ventilate when the interior temperature has cooled to room temperature. Only then open the
door.
VDL (E3) 09/2019
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