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BD / BF / ED / FD / FED (E3.1) 03/2019 page 59/106
Controller shutdown by the standby button has no effect on the internal socket.
WARNING
Internal socket switched on even though controller is shut down.
Electrical hazard.
Turn off the internal socket separately, when not in use, by the switch in the triangular
instrument panel
12.6 HEPA fresh air filter (option for FD, FED)
With this option, the introduced fresh air is cleaned by means of a high efficiency submicron particulate air
filter type HEPA class H 14 (acc. to DIN EN 1822:2009). Replace the filter insert, if necessary, by remov-
ing the metal cover of the filter at the left side of the chamber (Art. No. 6014-0003).
12.7 Mostly gas-tight version (option for BF, FD, FED)
With this option the chamber is additionally sealed, so the loss when introducing gases is decreased. The
chamber is not completely gas-tight, so it is impossible to establish overpressure. The sealing diminishes
the release of vapors via the housing that may be set free from the charging material when heated. Carry-
ing-off via the regular evacuation duct, e.g. into a waste air installation, is likely to further reduce emis-
sions.
The chamber is not completely gas-tight. Gases from inside the chamber can escape into the
surrounding atmosphere.
Observe the occupational exposure limit OEL for the released substance set by the national
authorities (formerly maximum permitted workplace concentration). Respect the relevant
regulations.
Any harmful gas that might escape has to be led out via good room ventilation or a suitable
exhaust system. Place the chamber, if necessary, below a gas vent.
The air flap does not close the exhaust duct completely. The delivered plug serves to avoid emerging of
vapors or loss of introduced inert gas, if any, via the exhaust duct. Due to special demands of heat re-
sistance, use the delivered plug only.
CAUTION
Use of inappropriate plug.
Danger of inflammation.
To close the exhaust duct use the delivered plug only.
For drying purpose, please remove the plug in order to permit dissipation of the generated vapor, which
would lead to condensation in the inner chamber.
12.8 Inert gas connection with mostly gas-tight version (option for BF, FD, FED)
With this option the chamber is additionally sealed, so the loss when introducing inert gases is decreased.
For details on the mostly gas-tight version please refer to chap. 12.7.
The chamber is equipped with two ports for inert gas (nitrogen or noble gases).
The ports are located on the top panel in the middle and on the chamber rear at the bottom right.
Each of these ports can be used as inlet or outlet, depending on the nature of the inert gas:
• lighter gas (nitrogen, helium): lower port as inlet
• heavy gas (e.g. argon): upper port as inlet
This distinction is important when operating with a reduced fan speed.
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