VDL (E3) 09/2019 Page 42/234
Theuser shall wear ESD protected clothing, shoes and gloves.
When installed and operated as intended, there will be equipotential bonding for loading and unloa-
ding and there is no risk of charges that are hazardous to operation.
• Extraction
Active extraction (technical ventilation) during operation of the VDL is mandatory.
The extraction has to be provided as technical ventilation according to country-specific regulations
(TRBS 2152 Part 2 for Germany). It must include the entire installation area of the vacuum drying
oven and pump; in addition, extraction must be provided on the floor behind the chamber. In normal
operation, it affects in particular the loading area of the chamber to limit and reduce any possible ex-
plosive atmosphere when loading the device.
Spreading of an explosive atmosphere to non-protected areas is prevented by the prescribed technical
ventilation.
Fault: If solvents or solvent vapors inadvertently reach areas of the installation location (e.g. if the ma-
terial to be loaded or the filled condensate catchpot of the pump fall down), the chamber must be tur-
ned off immediately (pull the power plug or operate the customer's explosion-protected emergency
stop switch) in order to prevent explosive atmosphere from penetrating into non-protected areas. The
technical ventilation at the installation site reduces the explosive atmosphere.
If, during a fault of the technical ventilation, material containing a solvent is located in the loading area
of the chamber, it must be removed immediately. If material containing a solvent is located inside the
chamber because it is being loaded at that moment, close the chamber door. The operator must en-
sure that no explosive atmosphere remains in the area around the chamber when there is no active
technical ventilation. Ensure that the operator can manually turn off the chamber immediately (pull the
power plug or operate the customer's explosion-protected emergency stop switch) in order to prevent
the chamber from restarting automatically.
If, during a fault of the technical ventilation caused by a power failure, material containing a solvent is
located in the loading area of the chamber, wait after the power has been restored or the technical
ventilation has restarted at least one hour until activating sweeping with compressed air and then turn-
ing on the chamber.
• Sealing
The area for electrical equipment is sealed so far that an overpressure can be built up. The front ope-
nings of the chamber (hinges, cable entry, door lock) are sealed. The inside of the door is sealed off
from the controller housing. In combination with sweeping with compressed air and the specified tech-
nical ventilation (extraction) provided by the operator, the penetration of solvent vapors into the area
for electrical equipment, the chamber housing, and the controller housing is prevented when loading
the device as well as when unloading material that has not completely dried.
• Authorization levels of the chamber controllers with password assignment
This makes it easier to restrict the use to trained users.
• Construction of the pump module and mandatory extraction, requirements for vacuum pumps
Various constructive features and measures to be taken by the operator prevent solvent vapors from
penetrating into the hot pump motor and into the electrical installation area in the event of incorrect
operation, e.g. spilling the content of the condensate catchpot of the pump when emptying it:
• Installation of the entire system under extraction (technical ventilation), this must run when
emptying.
• Use of Ex pumps is mandatory
• An extraction system provided by the customer must be connected to the port of the pump module.
This keeps the concentration in the pump module low
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