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VDL (E3.1) 10/2020 Page 51/196
DANGER
Explosion hazard due to sparking when disconnecting an improper electrical con-
nection.
Serious injury or death from burns and / or explosion pressure.
Make sure that the electrical connection is located outside a zone t.
Connect the plug outside the installation area of the VDL and the pump. Take into ac-
count the information on zone classification (chap. 3.5.2)
For the user there is no risk of temporary overvoltages in the sense of EN 61010-1:2010.
5.2 Ventilation and extraction (technical ventilation)
5.2.1 Ventilation for heat removal in normal operation
Install the vacuum drying oven in a well-ventilated place.
NOTICE
Danger of overheating due to lack of ventilation.
Damage to the chamber.
Do NOT set up chambers in non-ventilated recesses.
Ensure sufficient ventilation for dispersal of the heat.
Observe the prescribed minimum distances when installing the chamber (chap. 5.1)
5.2.2 Technical ventilation during chamber operation and when emptying the conden-
sate catchpot of the pump
Provide active extraction at the location of installation. The extraction shall be provided as technical venti-
lation according to country-specific regulations (TRBS 2152 Part 2 for Germany). It must include the entire
installation area of the chamber.
In normal operation, it affects in particular the loading area of the chamber for the spatial limitation and
reduction of any possible explosive atmosphere when loading the chamber. Also in the event of a fault (e.g.
if the material to be loaded or the filled condensate catchpot of the pump falls down), it causes spatial
limitation and reduction of any possible explosive atmosphere.
Extraction must be active during the entire operation of the chamber and when handling the condensate
catchpot of the pump. Extraction must lead into an explosion-proof area.
The operator must ensure active extraction before starting up the chamber. Extraction must be provided
during the entire operation of the chamber as well as when handling the condensate catchpot of the pump.
This ensures that solvent vapors never reach unprotected areas or accumulate in an impermissible manner.
If the technical ventilation fails, the power to the vacuum drying oven must be switched off. It must be
ensured that the device can be switched off by the operator using an explosion-protected device: Pull out
the power plug or operate e.g., a customer’s explosion-protected emergency stop switch.
5.2.3 Air supply (breaking the vacuum) during operation with inert gas
When operating the VDL safety 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).
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