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VDL (E3.1) 10/2020 Page 17/196
1.7.3 Safety instructions on vacuum supply
Prior to commissioning the chamber make sure that all relevant national and international regulations are
observed. Within the European Union, units that will be operated in potentially explosive areas have to meet
the requirements of ATEX Directive 2014/34/EU.
If combustible solvent is introduced into the drying chamber, the vacuum pump must be constructed in a
suitable explosion-proof manner.
Observe the safety instructions of the pump manufacturer.
1.7.3.1 Selection and location of a suitable pump
The mixtures extracted from the inner chamber must be carried away making sure that there is no danger
by ignition of these atmospheres. Sparking in the pump motor or the switching elements, electrostatic dis-
charges, as well as hot pump parts can ignite solvent vapors in the event of an error. To minimize this risk,
use an ATEX Directive 2014/34/EU compliant vacuum pump suitable for suction from Zone 0 or 1 and, if
appropriate, from the zone of its installation site.
DANGER
Explosion hazard due to the spread of an explosive atmosphere to unprotected
pump parts and ignition due to electric sparking on the pump motor or switching el-
ements, electrostatic discharges, or hot surfaces.
Serious injury or death from burns and / or explosion pressure.
Use only suitable, explosion-proof pumps. See chap. 6.5.1.
Operate the pump in a stationary position and secure it so it is immobile.
Make sure that the suction line to the vacuum connection (6) of the VDL is fixed and
conductive.
Ensure sufficient solvent condensation, e.g., in an exhaust waste vapor condenser, to
avoid that ignitable solvent concentrations are conducted from the pump. Otherwise,
the exhaust pipe after the pump must be fixed and conductive and suction must be
done in an explosion-proof area.
Ensure equipotential bonding between the pump, the VDL vacuum drying oven and, if
appropriate, the pump module using the connections of the grounding conductors ac-
cording to the grounding concept (Chap. 6.8).
Confirm that the vacuum pump is designed for a gas inlet temperature corresponding to
the used drying temperature, or take appropriate measures to cool down the extracted
vapor before it enters the vacuum pump.
Use ATEX compliant vacuum pumps providing an integral protective device for the
pump OR Install a current-dependent, delayed protective device for the pump (for the
triggering time of this protective device, see the manufacturer’s specifications). The pro-
tective and monitoring device must not be able to turn on independently again or be re-
leased.
Use ATEX compliant vacuum pumps providing an integral explosion proof switch OR
make sure that the switch gear box is either installed outside the hazardous area or that
it is explosion proof.
The ATEX compliant vacuum pump offered by BINDER provides an integral protective device
for the pump and an integral explosion proof switch.
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