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VDL (E3.1) 10/2020 Page 60/196
• If combustible solvent will be introduced into the inner chamber, the vacuum pump must be constructed
in a suitable explosion-proof manner. The mixtures extracted from the drying chamber must be carried
away making sure that there is no danger by ignition of these atmospheres.
Follow the safety instructions of the pump manufacturer.
In the event of an error, sparking in the pump motor or the switching elements, electrostatic discharges, as
well as hot pump parts can ignite solvent vapors. Minimize this risk by using 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 caused by emerging solvent vapors, which can ignite due to
sparking in the pump motor or the switching elements, electrostatic discharges and
hot pump parts.
Serious injury or death from burns and / or explosion pressure.
Use only suitable, explosion-proof pumps
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) is installed fix and conduc-
tive.
Avoid that the exhaust pipe conducts ignitable solvent concentrations by sufficient sol-
vent condensation e.g., in an exhaust waste vapor condenser
Make sure that the exhaust pipe is installed fix and conductive in case it may still con-
duct ignitable solvent concentrations.
Ensure equipotential bonding between the pump housing and the housing of the VDL
vacuum drying oven via the connected equipment grounding conductors of both units.
When using ATEX Directive 2014/34/EU non-compliant pumps:
Provide a current-dependent, delayed protective device for the pump (for the triggering
time of this protective device, see the manufacturer’s specifications). The protective and
monitoring device must not be able to independently turn on again or be released.
Install the switch gear box outside the hazardous area or provide it with explosion pro-
tection.
The ATEX Directive 2014/34/EU compliant pumps offered by BINDER provide an integral
protective device and an integral explosion proof switch.
Make sure that the vacuum source 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 into the vacuum source.
Observe the permissible gas inlet temperature of the vacuum pump in use. Do NOT exceed this
temperature. If the gas inlet temperature is too high and then becomes even warmer by compression in the
pump, the resulting temperature (of the gas-solvent mixture inside the pump) could exceed the solvent’s
temperature class and auto-ignition temperature .
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