VDL (E3) 09/2019 Page 68/234
Extracted vapors or the occasionally used inert gas can endanger health and / or have a corrosive effect
on the oven and pump.
WARNING
Danger of damage to health by release of extracted vapors.
Corrosion on the chamber and the pump. Damage to health.
Remove the extracted vapors and/or inert gas via a suitable conduit from the pump
module into e.g., a fume extractor facility.
Directly connect the conduit to the corresponding pump outlets.
You can connect a laboratory cooling system to the emission condenser of the vacuum pump
VP4 or VP5.
To operate the chemical membrane pumps VP4 (MZ2C EX) or VP5 (MD4C EX) please
refer to the enclosed pump manufacturer's operating manual.
Confirm 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 befo-
re its entry into the vacuum source.
The ATEX Directive 2014/34/EU compliant vacuum pump offered by BINDER is designed for a gas
inlet temperature of 40 °C / 104 °F max. 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 tem-
perature .
The maximum permissible ambient temperature of the vacuum pump supplied by BINDER is 40 °C /
104 °F.
6.4.4 Note on the use of a flame arrester
A flame arrester is not mandatory for VDL applications (TRBS 2152-4:2012). A pump designed for Zone 1
is equipped with a temperature sensor on the bearing which, in the event of a fault, causes the pump to
shut down immediately.
In certain circumstances, however, a flame arrester may provide additional protection.
A pump designed for Zone 2 is safe to operate as long as it is operating properly. A defective bearing
could lead to intense heating, possibly also to a flame (flash fire), both of which constitute a source of
ignition and must therefore be safely prevented. A pump for Zone 2 is permissible, but it must undergo
maintenance according to the manufacturer's instructions in order to safely exclude such incidents due to
wear.
For this reason, we recommend the installation of the flame arrester according to EN ISO 16852: 2017, in
order to safely exclude the flame flash-through – which cannot occur with a pump for Zone 1 – for a Zone
2 pump. This is not required if the necessary documentation (logbook, SOP) is available and secured,
proving the regular maintenance according to the specifications of the pump manufacturer.
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